2015 Microchip Technology Inc. DS70005224A-page 1
RN1723
Key Features:
• Complete, Embedded 2.4 GHz IEEE 802.11 b/g
Wireless LAN Module
• 14 General Purpose Input/Output (GPIO) Pins
(Four GPIO pins shared with the UART)
• Eight Analog Sensor Inputs
• Small Surface-Mount Module: 1.050” x 0.700” x
0.125” (26.67 mm x 17.78 mm x 3.18 mm)
• Integrated Crystal, Internal Voltage Regulator,
Matching Circuitry, Power Amplifier
• Integrates Easily into Final Product – Minimizes
Product Development, Provides Quicker Time to
Market
• Configured using Simple ASCII Commands
•Networking:
- Supports Infrastructure and SoftAp
Networking Modes
- Built-i n Net working Appl ications: TCP, UDP,
DHCP, DNS, ARP, HTTP Client, and FTP Client
- Complete On-Board TCP/IP Networking
Stack
- Unique MAC Address
- Upgrade Firmware Over-the-Air using FTP
- Supports Wi-Fi® Protected Setup (WPS)
Power Management:
• Ultra Low-Power Sleep Mode (4 µA)
• Perfect for Portable Battery-Operated Devices
• Battery Boost Control Circuitry
• Real-Time Clock for Time Stamping, Auto-Sleep,
and Auto-Wake
Antenna:
• External Antenna Connection via RF Pad
• Certifi ed An tenn a Types: Chi p, Wh ip, PC B Trace,
and Wire
Compliance:
• Modula r Certifi ed for the United States (FCC) and
Canada (IC)
• European R&TTE Directive Assessed Radio
Module
• Australia and New Zealand
FIGURE 1: RN1723 MODULE
Media Access Control (MAC)/Baseband:
•Security:
- WEP-128
- WPA-PSK (TKIP)
- WPA2-PSK (AES)
- TLS 1.0, 1.1, and 1.2 (with external microprocessor)
Operational:
• Operating Voltage: 3.3V (typical)
• Temperature Range: -40°C to +85°C Industrial
• Low Current Consumption:
- RX mode: 40 mA
- TX mode: 120 mA at 0 dBm
- Sleep mode: 4 µA
- Doze mode: 15 mA
RF/Analog:
• Frequency: 2.412 to 2.462 GHz
• Modulation:
- 802.11b Compatibility: DSSS (CCK-11,
CCK-5.5, DQPSK-2, DBPSK-1)
- 802. 11g: OFDM
- Receive Sensitivity: -83 dBm Typical
- Power Output: 0 to +12 dBm
Over-the-Ai r Da ta Rate:
• 1-11 Mbps for 802.11b
• 6-54 Mbps for 802.11g
Applications:
• Remote Equipment Monitoring
• Telemetry
• Industrial Sensors
• Home Automation
• Low-Power B attery Operations
2.4 GHz IEEE Std. 802.11 b/g Wireless LAN Module
RN1723
DS70005224A-page 2 2015 Microchip Technology Inc.
Table of Contents
1.0 Device Overview .......................................................................................................................................................................... 3
2.0 Circuit Desc r i p tion (Hard ware In terface).......... ............. ............. ............ ............. ............ ........... .................................................. 9
3.0 Applica tio n In formation......................... ............ ....... ............ ....... ............ ...... ............. ...... ........................................................... 15
4.0 Regulatory Approval.................................................... .... .... .... ......... .... .... .... ......... .... .... ............................................................. 17
5.0 Electrical Characteristics............................................................................................................................................................ 23
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2015 Microchip Technology Inc. DS70005224A-page 3
RN1723
1.0 DEVICE OVERVIEW
The RN1723 is a stand-alone, embedded 802.11 b/g
Wireless Local Area Network (WLAN) module. The
module incorporates an on-board TCP/IP networking
stack, cryptographic accelerator, power management
subsystem, real-time clock, versatile sensor interface,
2.4 GHz transceiver, and RF power amplifier (see
Figure 1-1). With the RN1723, designers can embed
Wi-Fi and networking functionality rapidly into virtually
any devic e.
The RN17 23 prov ides c ost and tim e-to-m arket s avings
as a self-contained, Internet-enabling solution. The
module has been de si gned to provid e desig ners wi th a
simple Wi-Fi sol uti on tha t feature s:
• Ease of integration and programming
• Vastly reduced development time
• Minimum system cost
• Long battery life
• Maximum value in a range of applications
The RN1723 is configured with a simple ASCII com-
mand language. The “WiFly Command Reference,
Advanced Features and Applications User's Guide”
(DS50002230), which is available for download from
www.microchip.com, contains a complete listing and
instructions of the ASCII command interface.
In the simplest configuration, the module requires only
power, ground, and UART Transmit (TX) and Receive
(RX) connections. The RN1723 module can interface
to low-cost microcontrollers using only two wires,
UART TX and RX.
The RN1723 has a versatile sensor interface that can
be used to monitor analog signals such as
temperature, audio, motion, and acceleration.
The module has a small form factor, which makes it
easy to integrate. Additionally, the module is
compatible with standard pick-and-place equipment.
The RN1723 is ideal for a vast range of applications
that require long battery life, moderate processing
power, mo derate dat a throug hput and o ccasion al Wi-Fi
connectivity, such as:
• Real-Time Locationing Systems (RTLS)
• Industrial and home automation
• Health and fitness monitoring
• Telemetry
•Security
Additionally, the module is perfect for mobile wireless
applications, such as asset monitoring and sensors.
The RN1723 can independently maintain a low-power
wireless network connection. Ultra-low power usage
and flexible power management maximize the
module’s lifetime in battery-operated devices. A wide
operating temperature range allows use in indoor and
outdoor environments (i.e., industrial temperature
range).
When operating in Sleep mode, the module minimizes
battery usage while still being able to respond to certai n
event s, includin g internal time rs and event s on the sen-
sor interfaces. Applications that make efficient use of
the Sleep st ate can extend battery life to mul tiple years.
The RN1723 has modular device approval for
operation in the United States (FCC) and Canada (IC).
The RN1723 module is an R&TTE Directive assessed
radio module for operation in Europe. Refer to
Section 4.0 “Regulatory Approval” for more
information.
FIGURE 1-1: RN1723 MODULE BLOCK DIAGRAM
Radio
PA
Accelerator ADC
2 MB ROM
Timers
SPI
GPIO
UART
Sensor Interfa ce
2 KB NVM
Management
Flash
Memory
SPI
GPIO
UART
VDD IN
VDD BATT
2.4 GHz
TX/RX
External
Antenna
RN1723
128 KB
RAM 32-bit
CPU
802.11 b/g
MAC/PHY
Power
2.4 GHz
2.4 GHz
Crypto
RN1723
DS70005224A-page 4 2015 Microchip Technology Inc.
1.1 ASCII Command & Data Interface
A complete description of the ASCII command and
data interface for th e RN1723 mod ule is provided i n the
“WiFly C ommand Re ference, Advanced Featur es and
Applica tio ns U ser 's Guide” (DS50002230).
1.2 Interface Description
Figure 1-1 shows the RN1723 pin diagram. Figure 1-3
shows the microcontroller to RN1723 interface.
Table 1-1 describes the RN1 723 pins.
FIGURE 1-2: RN1723 PIN DIAGRAM
FIGURE 1-3: MICROCONTROLLER TO RN1723 INTERFACE
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RN17
(Top View)
TX
RX
RTS
CTS
RX
TX
CTS(1)
RTS(1)
MCU RN1723
Note 1: Hardware flow control signals CTS and RTS should be used for
baud rates of 115200 or greater.
UARTUART
2015 Microchip Technology Inc. DS70005224A-page 5
RN1723
TABLE 1-1: PIN DESCRIPTIONS
Pin # Name Type Description
1 GND P Ground reference
2 ISP_TX DO In-system programming transmit
3 ISP_RX DI In-system programming receive
4 G PIO9/SD_CLK/SCL K DIO General purpose I/O 9 (1,2)/SDIO clock/SD-SPI slave SCLK
5 G PIO8/SD_D3/SS DIO Gene ral purpose I/O 8(1,3)/SDIO D3/SD-SPI slave select
6 G PIO7/SD_D2 DIO General purpose I/O 7 (1,3)/SDI O D2
7 GPIO6/SD_D1 /INT DIO General purpose I/O 6(1,3)/SDIO D1/SD-SPI slave INT
8 GPIO5/SD_D0/MISO DIO General purpose I/O 5(1,3)/SDIO D0/SD-SPI slave MISO
9 G PIO4/SD_CMD/MOSI DIO General purpose I/O 4(1,3)/SDIO CMD/SD-SPI slave MOSI
10 VDD P Positive supply
11 GPIO3 DIO Gene ral purpose I/O 3(1,1)
12 GPIO2 DIO General purpose I /O 2 (1,2)
13 GPIO1 DIO General purpose I /O 1 (1,2)
14 GND P Ground reference
15 SPI_CS DO SPI master chip select to internal Flash memory chip select (do not
connect)
16 SPI_MISO DI SPI master data Input to internal Flash memory data output (do not
connect)
17 SPI_SCK DO SPI master clock to internal Flash memory clock (do not connect)
18 SPI_MOSI DO SPI master data output to internal Flash memory data input (do not
connect)
19 FLASH_POWER P Internal Flash memory power
20 GND P Ground reference
21 GND P Ground reference
22 GND P Ground reference
23 GND P Ground reference
24 ANT AIO RF antenna. 50 impedance
25 GND P Ground reference
26 GND P Ground reference
27 GND P Ground reference
28 GND P Ground reference
29 SENSOR0 AI Sensor interface 0(4)
30 SENSOR1 AI Sensor interface 1(4)
31 SENSOR2 AI Sensor interface 2(4)
32 SENSOR3 AI Sensor interface 3(4)
33 SENSOR_POWER P Sensor power
34 VDD P Positive supply
35 SENSOR4 AI Sensor interface 4(4)
36 SENSOR5 AI Sensor interface 5(4)
Legend: A = Analog; D = Digital; I = Input; O = Output P = Power
Note 1: Refer to Section 5.0 “Electrical Characteristics” for the GPIO voltage and current limitations.
2: Digital input/output (bidirectional) 8 mA drive, ~83 K internal pull-down. 3.3V tolerant.
Reset State: Pull-down.
3: Digital input/output (bidirectional) 24 mA drive, no internal pull-down. 3.3V tolerant.
Reset State: High-Z (do not allow to float).
4: Analog input. 0-400 mV (do not exceed 1.2V DC).
RN1723
DS70005224A-page 6 2015 Microchip Technology Inc.
37 SENSOR6 AI Sensor interface 6(4)
38 SENSOR7 AI Sensor interface 7(4)
39 GND P Ground reference
40 RESET DI Module Reset. Internal 100 k pull-up resistor. Apply a pulse of at
leas t 160 µs
41 FORCE_AWAKE DI Module force awake. Internal 100 k pull-down resistor. Apply pulse
for at least 245 µs. While FORCE_AWAKE is asserted, the module is
prevented from sleepin g
42 GPIO14 DIO General purpose I/O 14(1,2)
43 RTS/GPIO13 DO/DIO UART asynchronous output/general purpose I/O(1,2)
44 CTS/GPIO12 DI/DIO UART asynchronous input/general purpose I/O(1,2)
45 RX/GPI O11 DI/DIO UART asynch ronous input/general pur pose I/O(1,2)
46 TX/GPIO10 DO/DIO UART asynchronous output/general purpose I/O(1,2)
47 GND P Ground reference
48 SREG_3V3_CTRL P Battery boost circuit control
49 VBATT P Battery voltage
TABLE 1-1: PIN DESCRIPTIONS (CONTINUED)
Pin # Name Type Description
Legend: A = Analog; D = Digital; I = Input; O = Output P = Power
Note 1: Refer to Section 5.0 “Electrical Characteristics” for the GPIO voltage and current limitations.
2: Digital input/output (bidirectional) 8 mA drive, ~83 K internal pull-down. 3.3V tolerant.
Reset State: Pull-down.
3: Digital input/output (bidirectional) 24 mA drive, no internal pull-down. 3.3V tolerant.
Reset State: High-Z (do not allow to float).
4: Analog input. 0-400 mV (do not exceed 1.2V DC).
2015 Microchip Technology Inc. DS70005224A-page 7
RN1723
1.3 Mounting Details
Figure 1-4 and Figure 1-5 show the physical
dimensions of the RN1723 module. Figure 1-6 shows
the recommended host PCB layout.
FIGURE 1-4: RN1723 MODULE
PHYSICAL DIMENSIONS
(TOP AND SIDE VIEW)
FIGURE 1-5: RN1723 MODULE
PHYSICAL DIMENSIONS
(BOTTOM VIEW)
FIGURE 1-6: RECOMMENDED HOST
PCB FOOTPRINT
Top View
Side
View
3DG'HWDLO
Note: Pads at:
0.190 x 0.890
0.260 x 0.025
0.575 x 1.035
are grounded plated through holes for shield mounting
Bottom
View
Dimensions are in inches.
Tolerances:
PCB Outline: +/- 0.005”
PCB Thickness: +/- 0.001”
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RN1723
DS70005224A-page 8 2015 Microchip Technology Inc.
1.4 Soldering Recommendat ions
The RN1723 wireless module was assembled using
the IPC/JEDEC J-STD-020 Standard lead-free reflow
profile. However, the RN1723 module can be soldered
to the host PCB using standard leaded and lead-free
solder reflow profiles.
To avoid damaging the module, it is recommended to
adhere to the following:
• Solder reflow recommendations are provided in
the Microchip application note, AN233 “Solder
Reflow Re co mm endation ” (DS00233)
• Do not exceed a peak temperature (TP) of 250°C
• Refer to the vendor’s solder paste data sheet for
specific reflow profile recommendations
• Use no-clean flux solder paste
• Do not wash, as moisture can be trapped under
the shield
• Use only one flow. If the PCB requires multiple
flows, apply the module on the final flow.
2015 Microchip Technology Inc. DS70005224A-page 9
RN1723
2.0 CIRCUIT DESCRIPTION
(HARDWARE INTERFACE)
2.1 UART Interface
The UART interface supports 2-wire (RX and TX)
and 4-wire (RX, TX, CTS, and RTS) configurations
with hardware flow control. The logic levels are
CMOS voltage levels (not RS-232 voltage levels).
The UART interface supports the following baud
rates in bits per second:
• 2,400
• 4,800
• 9,600
• 19,200
• 38,400
•115,200
• 230,400
Refer to the “WiFly Command Reference, Advanced
Features and Applications User's Guide”
(DS50002230) for UART configuration information.
2.2 SPI Master Interface
The RN1723 module contains a master Serial
Peripheral Interface (SPI), SPI_CS, SPI_CLK,
SPI_MISO, and SPI_MOSI, that is connected to an
internal Flash memory. Do not connect these pins on
the host PCB.
2.3 SDIO Client Inter face
The RN1723 modules contain an SDIO client with SD-
SPI mode and interface (SD_CLK/SCLK, SD_D3/SS,
SD-D2, SD_D1/INT, SD_D0/MISO, and SD_CMD/
MOSI). This interface is not currently implemented in
the WiFly application.
2.4 In-System Programming (ISP)
The ISP_TX, ISP_RX, and other pins allow in-system
programming of the module. The RN1723 module
firmware can be upgraded by ISP using a *.bin file.
Optionally, it is recommended to place the ISP header
on the ho st PC B to fa c il ita t e f irm w are up g r ad es dur i ng
development and manufacturing. The header is two
rows by 8 p ins with a 0.0 50 inch sp ace and p itch (Sam-
tech P/N FTSH-108-01-F-DV-K). Refer to Figure 3-3
for inform ati on ab ou t con ne cti ng to the m od ule for ISP.
The RN-ISP in-system programming interface con-
nect s to the module for ISP. In addition, ref er to the RN-
ISP product page on the Microchip web site for more
information.
2.5 The Sensor Interface
External sensor devices can connect to the RN1723
module via its sensor interface. There are a total of 8
sensor interface inputs available. They are labeled
SENSOR_IF[0] – SENSOR_IF[7], on the RN1723 Pin
diagram, as shown in Figure 1-2.
The sensor interface is suitable for, but not limited to,
connecting the following type of devices:
• Analog-to-Digital Conversion sensors
• Switch sensor
• Vibration sens ors, motion sens ors, and ball-and-tube
sensors
In addition to providing data input to the RN1723
module, some of the sensors can be used to wake-up
the module from sleep. A typical use case would have
one sensor input wake up the module, while another
sensor input provides it with external data that can be
transmitted wirelessly.
2.6 Analog Sensor Inputs
Eight sensor interface input pins, SENSOR_IF0
through SENSORIF7, can be used as analog sensor
inputs. The sensor pins are 1.2V tolerant and can
accept input voltages up to 1.2V, but saturate at
400 mV.
The RN1723 14-bit Analog-to-Digital Converter (ADC)
requires a 35 m s conv ers io n tim e, wi th 0.0 1% line ari ty.
The pertinent analog sensor input specifications are
provided in Table 2-1.
TABLE 2-1: ANALOG SENSOR INPUTS
For additi onal inst ruct io ns on h ow to r ead and manage
the data from the analog sensor inputs, please refer to
the show q <value> command in the “WiFly
Command Reference, Advanced Features and
Applica tion s User’s Guide” (DS50002230).
Note: The use of flow control is highly
recommended to ensure proper data
integrity.
Note: The over-the-air FTP update files (*.img
or *.mif) are not compatible with the ISP.
WARNING
DO NOT apply voltages greater than 1.2V on any
of the sensor pins. Failure to heed this warning
could result in permanent damage to the
module.
Parameter Value
AD SENSOR_IF[0 – 7]
measurement range 0-400 mV (not to exceed
1.2 VDC)
Resolution 14 bits = 12 µV
Accuracy 5% uncalibrated; 0.01%
calibrated
Minimu m conversi on tim e 35 µs (5 kHz ov er Wi-Fi®)
RN1723
DS70005224A-page 10 2015 Microchip Technology Inc.
2.6.1 SWITCH SENSORS
The RN1723 module has four switch sensor input pins
– SENSOR_IF[0 – 4]. These sensor pins can be used
to wake the module from sleep.
During sleep, the module can be configured to
continuously monitor the present state of the pins. Any
transition (low-to-high or high-to-low) will generate a
module wake-up signal.
A typical use case is to place the module into Sleep
mode, a nd use one o f the switches to trigger a wak e-up
event of the modul e. Af ter w a ki ng u p, t he m od ule can
then send a UDP/TCP packet.
Figure 2-1 shows an example schematic of how a
design er might connec t both a simple Reed Switch an d
tilt-vibe motion sensor (SQ_SEN-200-C) to
SENSOR_IF[0] and SENSOR_IF[3], respectively.
When pr operly en abled, a ny trans ition ac tivity on e ither
sensor will wake up the RN1723.
Please refer to the “WiFly Command Reference,
Advanced Features and Applications User’s Guide”
(DS50002230A), and the section on the set sys
trigger <mask> command for instructions on how
to enable the switch sensor inputs on the module.
Table 2-2 shows the specific value of the ‘mask’ that is
required to enable a ny of the SENSOR_IF[0 – 3] input s
to act as module wake-up signals.
TABLE 2-2: SENSOR INPUT ENABLE
FIGURE 2-1: CONNECTING A REED SWITCH AND MOTION SENSOR EXAMPLE
Wake On
Sensor
Input Value Command
01Set sys trigger 1
12Set sys trigger 2
24Set sys trigger 4
38Set sys trigger 8
WARNING
The voltage on any sensor input CANNOT
exceed 1.2V DC. Failure to heed this warning
could result in permanent damage to the
module.
ISP_RX
ISP_TX
GND
URTS
SENSOR_3
SENSOR0 29
SENSOR1 30
SENSOR2 31
SENSOR3 32
SENSOR4 35
SENSOR5 36
GND
1
ISP_TX
2
ISP_RX
3
GND
14
SPI_CS 15
SPI_MISO 16
SPI_SCK 17
SPI_MOSI 18
GND
20
GND
21
GND
22
GND
23
GND
25
GND
26
GND
27
GND
28 SENSOR6 37
SENSOR7 38
GND
39
FORCE_AWAKE
GPIO14 42
RTS/GPIO13 43
CTS/GPIO12
GND
47
U2
GND
SQ-SEN-200-C
1 2
U8
REED SPST
SW2
GND
SENSOR_0
CTS
RTS
2015 Microchip Technology Inc. DS70005224A-page 11
RN1723
Another common usage case for the RN1723 module
is to put it to sleep and only wake the module when
there is d ata pres ent on it s UAR T RX line , as illus trated
in Figure 2-2.
FIGURE 2-2: WAKE ON UART RECEIVE
GPIO_4/MOSI
GPIO_5/MISO
GPIO_6/SIRQn
GPIO_7
GPIO_8/SSn
GPIO_9/SCK
RESET_N
FORCE_WAKE
ISP_RX
ISP_TX
GND
VDD_3V3
RN_UTX
RN_URX
RN_UCTS
RN_URTS
VDD_3V3
SENSOR_3
GPIO_1/MODE
GPIO_2
GPIO_3
0R
R19
SW6
SW4
SENSOR0 29
SENSOR1 30
SENSOR2 31
SENSOR3 32
SENSOR_POWER
33
VDD
34
SENSOR4 35
SENSOR5 36
GPIO7/SD_D2 6
GPIO6/SD_D1/INT 7
GPIO5/SD_D0/MISO 8
GPIO4/SD_CMD/MOSI 9
VDD
10
GPIO3 11
GPIO2 12
GPIO1 13
GND
1
ISP_TX
2
ISP_RX
3
GPIO9/SD_CLK/SCLK 4
GPIO8/SD_D3/SS 5
GND
14
SPI_CS 15
SPI_MISO 16
SPI_SCK 17
SPI_MOSI 18
FLASH_POWER
19
GND
20
GND
21
GND
22
GND
23
ANT 24
GND
25
GND
26
GND
27
GND
28 SENSOR6 37
SENSOR7 38
GND
39
RESET
40
FORCE_AWAKE
41
GPIO14 42
RTS/GPIO13 43
CTS/GPIO12 44
RX/GPIO11 45
TX/GPIO10 46
GND
47
SREG_3V3_CTRL
48
VBATT
49
U2
GND
VBAT
SREG_CTRL
SENSOR_0
FLASH_PWR
A1
0R
R13
GND
A2
SENSOR_1
SENSOR_2
SENSOR_4
SENSOR_5
SENSOR_6
SENSOR_7
GPIO_14
SENSOR_POWER
GND
SQ-SEN-200-C
12
U8
SPI_MISO
SPI_MOSI
SPI_CLK
nSPI_CS
CTS
RTS
TX
RX
Microcontroller
*
Component_1
470R
R32
470R
R33
100k
R35
100k
R34
GND
SENSOR_0SENSOR_1
RN1723
DS70005224A-page 12 2015 Microchip Technology Inc.
2.7 General Purpose Input/Output
(GPIO) Pins
The RN1723 module has 14 GPIO (GPIO1 through
GPIO14) pins that can be commanded by ASCII com-
mands. GPIO10 through GPIO14 pins have secondary
functio ns for th e UAR T (TX, RX, CTS, an d R TS) , whil e
others can control connection modes, LEDs, etc.
Refer to the “WiFly Command Reference, Advanced
Features and Applications User's Guide”
(DS50002230) for information on configuring and
controlling the module.
2.8 Flash Voltage Supply
The FLASH_POWER pin on the RN1723 module is
used to power the internal Flash memory of the mod-
ule. However, it can also supply other external compo-
nents, up to a limit of 25 mA total current. When the
RN1723 is in Sleep mode, it does n ot driv e th is su pply.
2.9 Power Management
The module supports an ultra-low power Sleep state,
from whic h it can wake for a range of d etected reas ons.
It transitions from sleep to CPU active in 1.7 ms, and
from CPU active to network connection in less than 35
ms (typical). The RN1723 also supports a Doze state
that pr ovides an ins tant trans ition from Sle ep to a W ake
state.
2.9.1 FORCE AWAKE
The RN1723 module may be forced awake by assert-
ing the FORCE_AWAKE pin for at least 245 ms. If the
FORCE_AWAKE pin remains asserted, the module is
prevented from sleeping or dozing.
2.9.2 POWER SUPPLY
The RN172 3 module is design ed to operate with a wide
range of batteries, as well as a linear power supply.
A power source that supplies a constant voltage
greater than 3.0V can drive the module directly, as
shown in Figure 2-3.
FIGURE 2-3: POWER SUPPLY FOR BATTERY (3.0V TO 3.7V)
SREG_3V3_CTRL (48)
Battery
3.0V to 3.7V
VBATT (49)
VDD (10, 34)
RN1723
2015 Microchip Technology Inc. DS70005224A-page 13
RN1723
2.9.3 BATTERY BOOST CONTROL
CIRCUIT
An external boost control circuit is required for battery
powered designs that provide less than 3.0V because
the RN1723 module does not have an internal boost
regulator circuit.
Figure 2-4 shows the recommended circuit for the
boost regulator.
FIGURE 2-4: RECOMMENDED BOOST REGULATOR CIRCUIT
WARNING
The battery boost circuit should not be operated
with battery supply voltages above 3.7 volts.
Failure to heed this warning could result in
permanent damage to the module.
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RN1723
DS70005224A-page 14 2015 Microchip Technology Inc.
The stand-alone boost circuitry is shown in Figure 2-5.
FIGURE 2-5: POWER SUPPLY FOR BATTERY (1.8V TO 3.3V)
2.10 Module Reset
There are several ways to Reset the module:
• A Power-on Reset (POR) is generated
automatically when power is applied. This Reset is
intended to initialize the module when a new
battery is connected
• Perform an external POR by pulling the RESET
pin low
• Perform a soft POR using software commands
• A Reset can be triggered by a critical event, such
as a brown-out, which is generated if the supply
voltage drops below the minimum operating
voltage
2.10.1 BROWN-OUT DETECTION
The RN1723 includes a brown-out detector that holds
the module in Reset if the battery voltage falls below
the minimum operating voltage.
SREG_3V3_CTRL (48)
Battery
1.8V to 3.7V
VBATT (49)
VDD (10, 34)
Siliconix
Si2312DS
20 µF
1 µH RN1723
Note: If the RN1723 module is used in battery
applications, it is highly recommended
that a voltage supervisory device be
employed.
2015 Microchip Technology Inc. DS70005224A-page 15
RN1723
3.0 APPLICATION INFORMATION
3.1 External Antenna Types
The RN172 3 module has a 50 anten na connec tion on
pin 24. Connect to an antenna through a host PCB
microstrip trace layout to an external connector, PCB
trace an tenna, or comp onent (chip) a ntenna. This trace
can be extended to include passive parts for antenna
attenuation padding, impedance matching, or to
provide test ports.
It is recommended that the trace layout from pin 24 to
the external connector or antenna be as short as
possib le for m in im um los s and bes t i mp eda nc e m atc h-
ing. If the trace layout is longer, it should be a 50
impedance microstrip or co-planar waveguide PCB
trace.
Adjacent ground pins 21-23 and 25-27 should be
connected to a low-impedance ground plane on the
host PCB.
Modular certification of the RN1723 module was per-
formed with the external antenna types listed in
Table 3-1. An antenna type comprises of antennas hav-
ing similar in-band and out-of-band radiation patterns.
Refer to Section 4.0 “Regulatory Approval” for
specific regulatory requirements by country.
TABLE 3-1: TESTED EXTERNAL
ANTENNA TYPES
3.1.1 PCB TRACE ANTENNA
Modular certification of the RN1723 module was
performed with the PCB trace antenna shown in
Figure 3-1. The exact dimensions of the trace
antenna must be followed.
Gerber files for the PCB trace antenna are available
on the RN1723 module product page:
http://www.microchip.com/rn1723
FIGURE 3-1: PCB TRACE ANTENNA
3.1.2 CHIP ANTENNA
Modular certification of the RN1723 module was
preformed with the Fractus (http://www.fractus.com)
chip antenna part number FR05-S1-N-0-104. Peak
gain listed in the data sheet is 1.07 dBi. Any chip
antenna type may be used with the RN1723 module,
provi de d the gain is equa l to or less than 1.07 dBi, an d
having similar in-band and out-of-band radiation pat-
terns as the Fractus antenna. For proper operation of
the chip antenna, refer to the vendor data sheet for
PCB footprint details and mounting considerations.
3.1.3 W HIP ANTENNA
Modular certification of the RN1723 module was
performed with a whip antenna with a peak gain of
2.2 dBi.
Any whip antenna type may be used with the RN1723
module, provided the gain is equal to or less than
2.2 dBi, and having similar in-band and out-of-band
radiation patterns.
Connection to the whip antenna can be by a U.FL.
Figure 3-2 shows a suggested PCB layout for a U.FL
connector.
FIGURE 3-2: U.FL CONNECTOR
Note: Other components, such as amplifiers and
active drivers, are not considered part of
the trace la yout and ma y void the modular
certification of the RN1723 module.
Type(1) Gain
PCB Trace 0 dBi
Chip 1.07 dBi
Wire 0 dBi
Whip 2.2 dBi
Note 1: An antenna type comprises of antennas
having similar in-band and out-of-band
radiation patterns.
)HHG
3RLQW
7RSFRSSHU
JURXQGSRXU
Dimensions are in inches.
RN1723
DS70005224A-page 16 2015 Microchip Technology Inc.
3.2 Optional ISP Header Schematic
Figure 3-3 shows a diagram with the optional ISP
header.
FIGURE 3-3: OPTIONAL IN-SYSTEM PROGRAMMING (ISP) HEADER
GND
ISP_TX
FORCE_AWAKE
ISP_RX
NC
GND
ISP_TX
FORCE_AWAKE
ISP_RX
RXD
RESET_N
TXD
GND
ISP Connector
1
3
5
7
9
2
4
6
8
10
J8
NC
RXD
RESET_N
TXD
GND
2015 Microchip Technology Inc. DS70005224A-page 17
RN1723
4.0 REGULATORY APPROVAL
This section outlines the regulatory information for the
RN1723 module for the following countries:
• United States
• Canada
• Europe
• Australia
• New Zealan d
• Other Regulatory Jurisdictions
4.1 United States
The RN1723 module has received Federal
Communications Commission (FCC) CFR47
Telecommunications, Part 15 Subpart C “Intentional
Radiators” modular approval in accordance with Part
15.212 Modular Transmitter approval. Modular
approval allows the end user to integrate the RN1723
module into a finished product without obtaining
subsequent and separate FCC approvals for
intentional radiation, provided no changes or
modifications are made to the module circuitry.
Changes or modifications could void the user’s
authority to operate the equipment. The end user
must comply with all of the instructions provided by
the Grantee, which indicate installation and/or
operating conditions necessary for compliance.
The finished product is required to comply with all
applicable FCC equipment authorizations regulations,
requirements and equipment functions not associated
with the transmitter module portion. For example,
compliance must be demonstrated to regulations for
other transmitter components within the host product;
to requirements for unintentional radiators (Part 15
Subpart B “Unintentional Radiators”), such as digital
devices, computer peripherals, radio receivers, etc.;
and to additional authorization requirements for the
non-transmitter functions on the transmitter module
(i.e., Verification, or Declaration of Conformity) (e.g.,
transmitter modules may also contain digital logic
functions) as appropriate.
4.1.1 LABEL ING AND USER
INFORMATION REQUIREMENTS
The RN1723 module has been labeled with its own
FCC ID number, and if the FCC ID is not visible when
the module is installed inside another device, then the
out side of the finished pro duct i nto whic h the modul e is
installed must also display a label referring to the
enclosed module. This exterior label can use wording
as follows:
A user’s manual for the product should include the
following statement:
Additional information on labeling and user
information requirements for Part 15 devices can be
found in KDB Publication 784748 available at the FCC
Office of Engineering and Technology (OET)
Laboratory Division Knowledge Database (KDB):
http://apps.fcc.gov/oetcf/kdb/index.cfm
Contains Transmitter Module FCC ID: OA3RN1723
or
Contains FCC ID: OA3RN1723
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference,
and (2) this device must accept any interference
received, including interference that may cause
undesired operation.
This equipment has been tested and found to
comply with the limits for a Class B digital device,
pursuant to part 15 of the FCC Rules. These limits
are designed to provide reasonable protection
against harmful interference in a residential
installation. This equipment generates, uses and
can radiate radio frequency energy, and if not
installed and used in accordance with the
instructions, may cause harmful interference to
radio communications. However, there is no
guarantee that interference will not occur in a
particular installation. If this equipment does cause
harmful interference to radio or television reception,
which can be determined by turning the equipment
off and on, the user is encouraged to try to correct
the interference by one or more of the following
measures:
• Reorient or relocate the receiving antenna
• Increase the separation between the equipment
and receiver
• Connect the equipment into an outlet on a circuit
different from that to which the receiver is
connected
• Consult the dealer or an experienced radio/TV
technician for help
RN1723
DS70005224A-page 18 2015 Microchip Technology Inc.
4.1. 2 RF EXPOSURE
All transm itters regulated by FCC must comply with RF
exposure requirements. KDB 447498 General RF
Exposure Guidance provides guidance in determining
whether proposed or existing transmitting facilities,
operations or devices comply with limits for human
exposure to Radio Frequency (RF) fields adopted by
the Federal Communications Commission (FCC).
From the FCC Grant: Modular approval. Output power
listed is conducted. This module may only be installed
by the OEM or an OEM integrator. Only antenna(s)
documented in this filing may be used with this trans-
mitter. The a ntenna(s) u sed for this t ransmitte r must be
installed to provide a separation distance of at least 20
cm from all persons and must not be collocated or
operating in conjunction with any other antenna or
transmitter within a host device, except in accordance
with FCC multi-transmitter product procedures. OEM
integrators and End-users and installers must be pro-
vided with antenna installation instructions and trans-
mitter operating conditions for satisfying RF exposure
compliance.
4.1.3 APPROVED EXTERNAL ANTENNA
TYPES
To maintain modular approval in the United States,
only the antenna types that have been tested shall
be used. It is permissible to use different antenna
manufacturers provided the same antenna type that
has similar in-band and out-of-band radiation
patterns and antenna gain (equal to or less than) is
used.
Modular approval testing of the RN1723 module was
perform ed with the antenna types listed in Table 3-1.
4.1. 4 HELPFUL WEB SITES
• Federal Communications Commission (FCC):
http://www.fcc.gov
• FCC Of fic e of Eng ineering a nd Technol ogy (O ET)
Laboratory Division Knowledge Database (KDB):
http://apps.fcc.gov/oetcf/kdb/index.cfm
4.2 Canada
The RN1723 module has been certified for use in
Canada under Industry Canada (IC) Radio Standards
Specification (RSS) RSS-210 and RSSGen. Modular
approval permits the installation of a module in a
host device without the need to recertify the device.
4.2.1 LABEL ING AND USER
INFORMATION REQUIREMENTS
Labeling Requirements for the Host Device (from
Section 3.2.1, RSS-Gen, Issue 3, December 2010):
The host device shall be properly labeled to identify
the module within the host device.
The Industry Canada certification label of a module
shall be clearly visible at all times when installed in
the host device, otherwise the host device must be
labeled to display the Industry Canada certification
number of the module, preceded by the words
“Contains transmitter module”, or the word
“Contains”, or similar wording expressing the same
meaning, as follows:
User Manual Notice for License-Exempt Radio
Apparatus (from Section 7.1.3 RSS-Gen, Issue 3,
December 2010): User manuals for license-exempt
radio apparatus shall contain the following or
equivalent notice in a conspicuous location in the
user manual or alternatively on the device or both:
Transmitter Antenna (from Section 7.1.2 RSS-Gen,
Issue 3, December 2010): User manuals for
transmitters shall display the following notice in a
conspicuous location:
The above notice may be affixed to the device instead
of display ed in the us er manu al .
Contains transmitter module IC: 7693A-RN1723
This device complies with Industry Canada
license-exempt RSS standard(s). Operation is
subject to the following two conditions: (1) this
device may not cause interference, and (2) this
device must accept any interference, including
interference that may cause undesired operation of
the device.
Le pré sent appar eil est confor me aux CNR d'In dus-
trie Can ada a pplic ables aux app arei ls ra dio e xempt s
de licence. L'exploitation est autorisée aux deux
conditions suivantes: (1) l'appareil ne doit pas
produire de bro uilla ge, et (2) l' utilis ateur de l'app arei l
doit accepter tout brouillage radioélectrique subi,
même si le brouillage est susceptible d'en
compromettre le fonctionnement.
Under Industry Canada regulations, this radio
transmitter may only operate using an antenna of
a type and maximum (or lesser) gain approved for
the transmitter by Industry Canada. To reduce
potential radio interference to other users, the
antenna type and its gain should be so chosen
that the equivalent isotropically radiated power
(e.i.r.p.) is not more than that necessary for
successful communication.
Conformément à la réglementation d'Industrie
Canada, le présent émetteur radio peut fonctionner
avec une anten ne d'un type et d'un gain ma ximal (ou
inférieur) approuvé pour l'émetteur par Industrie
Canada. Dans le but de réduire les risques de
brouillage radioélectrique à l'intention des autres
utilisateurs, il faut choisir le type d'antenne et son
gain de sorte que la puissance isotrope rayonnée
équivalente (p.i.r.e.) ne dépasse pas l'intensité
nécessaire à l'établissement d'une communication
satisfaisante.
2015 Microchip Technology Inc. DS70005224A-page 19
RN1723
User manuals for transmitters equipped with
detachable antennas shall also contain the following
notice in a conspicuous location:
Immediately following the above notice, the
manufacturer shall provide a list of all antenna types
approved for use with the transmitter, indicating the
maximum permissible antenna gain (in dBi) and
required im ped anc e for eac h.
4.2. 2 RF EXPOSURE
All transmitters regulated by IC must comply with RF
exposure requirements listed in RSS-102 - Radio
Frequency (RF) Exposure Compliance of
Radiocommunication Apparatus (All Frequency
Bands).
4.2.3 APPROVED EXTERNAL ANTENNA
TYPES
Transmitter Antenna (from Section 7.1.2 RSS-Gen,
Issue 3, December 2010):
The RN1723 module can only be sold or operated
with antennas with which it was approved.
Transmitter may be approved with multiple antenna
types. An antenna type comprises antennas having
similar in-band and out-of-band radiation patterns.
Testing shall be performed using the highest gain
antenna of each combination of transmitter and
antenna type for which approval is being sought,
with the transmitter output power set at the
maximum level. Any antenna of the same type
having equal or lesser gain as an antenna that had
been successfully tested with the transmitter, will
also be considered approved with the transmitter,
and may be used and marketed with the transmitter.
When a measurement at the antenna connector is
used to determine RF output power, the effective
gain of the device's antenna shall be stated, based
on measurement or on data from the antenna
manufacturer. For transmitters of output power
greater than 10 milliwatts, the total antenna gain
shall be added to the measured RF output power to
demonstrate compliance to the specified radiated
power limits.
Modular approval testing of the RN1723 module was
performed with the antenna types listed in Table 3-1.
4.2. 4 HELPFUL WEB SI TES
Industry Canada: http://www.ic.gc.ca/
4.3 Europe
The RN1723 module is an R&TTE Directive
assessed radio module that is CE marked and has
been manufactured and tested with the intention of
being integrated into a final product.
The RN1723 module has been tested to R&TTE
Directive 1999/5/EC Essential Requirements for
Health and Safety (Article (3.1(a)), Electromagnetic
Compatibility (EMC) (Article 3.1(b)), and Radio
(Article 3.2) and are summarized in Table 4-1. A
Notified Body Opinion has also been issued. All test
reports are available on the RN1723 product web
page at http://www.microchip.com.
This radio transmitter (identify the device by
certification number, or model number if Category
II) has been approved by Industry Canada to
operate with the antenna types listed below with
the maximum permissible gain and required
antenna impedance for each antenna type
indicated. Antenna types not included in this list,
having a gain greater than the maximum gain
indicated for that type, are strictly prohibited for
use with this device.
Conformément à la réglementation d'Industrie
Canada, le présent émetteur radio peut fonctionner
avec u ne antenn e d'un type et d 'un gai n maximal (ou
inférieur) approuvé pour l'émetteur par Industrie
Canada. Dans le but de réduire les risques de
brouillage radioélectrique à l'intention des autres
utilisateurs, il faut choisir le type d'antenne et son
gain de sorte que la puissance isotrope rayonnée
équivalente (p.i.r.e.) ne dépasse pas l'intensité
nécessaire à l'établissement d'une communication
satisfaisante.
RN1723
DS70005224A-page 20 2015 Microchip Technology Inc.
The R&TTE Compliance Association provides
guidance on modular devices in document Technical
Guidance Note 01 available at:
http://www.rtteca.com/html/download_area.htm
4.3.1 LABEL ING AND USER
INFORMATION REQUIREMENTS
The label on the final product which contains the
RN1723 module must follow CE marking
requirements. The R&TTE Compliance Association
Technical Guidance Note 01 provides guidance on
final product CE marking.
4.3.2 EXT ERN AL ANTE NNA
REQUIREMENTS
From R&TTE Compliance Association document
Technical Guidance Note 01:
Provided the integrator installing an assessed radio
module with an integral or specific antenna and
installed in conformance with the radio module manu-
facturer’s installation instructions requires no further
evaluation under Article 3.2 of the R&TTE Direct ive and
does not require further involvement of an R&TTE
Directive Notified Body for the final product, refer to
Section 2.2 .4.
The European Compliance Testing listed in Table 4-1
was performed using the antenna types listed in
Table 3-1.
4.3. 3 HELPFUL WEB SI TES
A document that can be used as a starting point in
understanding the use of Short Range Devices (SRD)
in Europe is the European Radio Communications
Committee (ERC) Recommendation 70-03 E, which
can be down loade d from the Euro pean Ra dio Com mu-
nicatio ns Of fi ce (ERO) at: http://www.ero.dk/.
Additional helpful web sites are:
• Radio and Telecommunications Terminal
Equipment (R&TTE):
http://ec.europa.eu/enterprise/rtte/index_en.htm
• Europe an Co nfe ren ce of Post al and
Telecommunications Administrations (CEPT):
http://www.cept.org
• Europe an Tel ec om mu nic ati on s Standards
Institute (ETSI):
http://www.etsi.org
• Europe an Ra di o Comm unicatio ns Office (ERO):
http://www.ero.dk
• The Radio and Telecommunications Terminal
Equipment Compliance Association (R&TTE CA):
http://www.rtteca.com/
TABLE 4-1: EUROPEAN COMPLIANCE TESTING
Note: To maintain conformance to the testing
listed in Table 4-1, the module shall be
installed in accordance with the
installation instructions in this data sheet
and shall not be modified.
When integrating a radio module into a
completed product the integrator
becomes the manufacturer of the final
product and is therefore responsible for
demonstrating compliance of the final
produ ct with th e esse ntial req ui rement s of
the R&TTE Directive.
Certification Standard Article Laboratory Report Number Date
Safety EN 60950-1:2006+A11:2009
+A1:2010+A12:2011 (3.1(a)) Worldwide
Testing
Services
(Taiwan) Co.,
Ltd.
W6R21403-14023-L 2014-05-13
Health EN 62479 (2010) W6R21403-14023-62479 2014-05-09
EMC EN 301 489-1 V1.9.2 (2011-09) (3.1(b)) W6R21403-14023-E-16 2014-05-08
EN 301 489-17 V2.2.1
(2012-09)
Radio EN 300 328 V1.8.1 (2012-06) (3.2) W6R21403-14023-T-45 2014-05-09
Notifi ed Body
Opinion Eurofins
Product
Service GmbH
U9M-1406-3898-C-V01 2014-06-17
2015 Microchip Technology Inc. DS70005224A-page 21
RN1723
4.4 Australia
The Austra lia radio regul ations do not provide a m od u-
lar approval policy similar to the United States (FCC)
and Cana da (IC). How ever, RN1723 module RF trans-
mitter test reports can be used in part to demonstrate
compli ance in acc ordance wit h ACMA Radio co mmuni-
cations “Short Range Devices” Standard 2004 (The
Short Range Devices standard calls up the AS/NZS
4268:2008 industry standard). The RN1723 module
test report s can be used as part of the produ ct certifica-
tion and co mpliance folder. For more information on the
RF transmitter test reports, contact Microchip
Technology Australia sales office.
To meet overall Australian final product compliance, the
developer must construct a compliance folder contain-
ing all relevant compliance test reports e.g. RF, EMC,
electrical safety and DoC (Declaration of Conformity)
etc. It i s the respons ibility of t he integrator to know what
is required in the compliance folder for ACMA compli-
ance. All test reports are available on the RN1723
product web page at http://www.microchip.com. For
more information on Australia compliance, refer to the
Australian Communications and Media Authority web
site http://www.acma.gov.au/.
4.4.1 EXT ERN AL ANTE NNA
REQUIREMENTS
The compliance testing listed in Table 4-1 was per-
formed using the antenna types listed in Table 3-1.
4.4. 2 HELPFUL WEB SITES
The Australian Communications and Media Authority:
www.acma.gov.au/.
4.5 New Zealand
The New Zealand radio regulations do not provide a
modular approval policy similar to the United States
(FCC) and Canada (IC). However, RN1723 module RF
transmitter test reports can be used in part to demon-
strate compliance against the New Zealand “General
User Radio License for Short Range Devices”. New
Zealand Radio communications (Radio Standards)
Notice 2010 calls up the AS / NZS 4268:2008 industry
standard. The RN1723 module test reports can be
used a s par t of the pro duct certifi cation and compli ance
folder. All test reports are available on the RN1723
product web page at http://www.microchip.com. For
more information on the RF transmitter test reports,
contact Microchip Technology sales office.
Information on the New Zealand short range devices
license can be found in the following web links:
•http://www.rsm.govt.nz/cms/licensees/types-ofli-
cence/general-user-licences/short-range-devices
•http://www.rsm.govt.nz/cms/policy-and-planning/
spectrum-policy-overview/legislation/gazette-
notices/product-compliance/
To meet o verall N ew Zealand fi nal produc t complia nce,
the developer must construct a compliance folder con-
taining all relevant compliance test reports e.g. RF,
EMC, ele ctrical safe ty and DoC (De claration of Confor-
mity) etc. It is the responsibility of the developer to
know wha t is requ ired in th e comp lianc e folde r for New
Zealand Radio communications. For more information
on New Zealand compliance, refer to the web site
http://www.rsm.govt.nz/.
4.5.1 EXTERNAL ANTENNA
REQUIREMENTS
The compliance testing listed in Table 4-1 was
performed using the antenna ty pes listed in Table 3-1.
4.5. 2 HELPFUL WEB SI TES
Radio Spectrum Ministry of Economic Development:
http://www.rsm.govt.nz/.
4.6 Other Regulatory Jurisdictions
Should other regulatory jurisdiction certification be
required by the customer, or the customer need to
recertify the module for other reasons, a certification
utility is available. For further regulatory certification
utility and documentation, contact your local
Microchip Technology sales office.
RN1723
DS70005224A-page 22 2015 Microchip Technology Inc.
NOTES:
2015 Microchip Technology Inc. DS70005224A-page 23
RN1723
5.0 ELECTRICAL CHARACTERISTICS
TABLE 5-1: ENVIRONMENT A L CONDITIONS
Parameter Value
Temperature Range (Operating) -40º C to 85º C
Temperature Range (Storage) -40º C to 85º C
Relative Humidity (Operating) 90%
Relative Humidity (Storage) 90%
Moisture Sensitivity Level 1
TABLE 5-2: ELECTRICAL CHARACTERISTICS
Characteristic Minimum Typical Maximum Units
Supply Voltage
VBATT 1.8 3.3 3.7 VDC
VDD_3V3 -0.3 — 3.7 VDC
VDD 3.0 — 3.7 V
Digital Input
Input Logic High VIH 2.3 — — VDC
Input Logic Low VIL ——1.0VDC
Digit al Output Drive
GPIO 4, 5, 6, 7, 8 — 24 — mA
GPIO 9, 10, 11, 12, 13 — 8 — mA
Power Consumption
Sleep — 4 — µA
Stand-by (Doze) — 15 — mA
Connected (Idle, RX) — 40 — mA
Connected (TX) 0 dBm — 120 — mA
Connected (TX) 12 dBm —190— mA