REV. E
a
AD7814
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10-Bit Digital Temperature Sensor
in 6-Lead SOT-23
FUNCTIONAL BLOCK DIAGRAM
SERIAL
BUS
INTERFACE
AD7814
VDD
CS
SCLK
DIN
DOUT
GND
TEMPERATURE
VALUE
REGISTER
10-BIT
ANALOG/DIGITAL
CONVERTER
BAND GAP
TEMPERATURE
SENSOR
FEATURES
10-Bit Temperature-to-Digital Converter
–55C to +125C Operating Temperature Range
2C Accuracy
SPI- and DSP-Compatible Serial Interface
Shutdown Mode
Space-Saving SOT-23 Package
APPLICATIONS
Hard Disk Drives
Personal Computers
Electronic Test Equipment
Office Equipment
Domestic Appliances
Process Control
GENERAL DESCRIPTION
The AD7814 is a complete temperature monitoring system in a
SOT-23 package or 8-lead MSOP package. It contains a band
gap temperature sensor and 10-bit ADC to monitor and digitize
the temperature reading to a resolution of 0.25°C.
The AD7814 has a flexible serial interface that allows easy inter-
facing to most microcontrollers. The interface is compatible
with SPI
®
, QSPI™, and MICROWIRE™ protocol, and is also
compatible with DSPs. The part features a standby mode that is
controlled via the serial interface.
The AD7814’s wide supply voltage range, low supply current,
and SPI-compatible interface make it ideal for a variety of
applications, including personal computers, office equipment,
and domestic appliances.
Purchase of licensed I
2
C components of Analog Devices or one of its sublicensed
Associated Companies conveys a license for the purchaser under the Philips I
2
C
Patent Rights to use these components in an I
2
C system, provided that the system
conforms to the I
2
C Standard Specification as defined by Philips.
PRODUCT HIGHLIGHTS
1. The AD7814 has an on-chip temperature sensor that allows
an accurate measurement of the ambient temperature. The
measurable temperature range is –55°C to +125°C, with a
±2°C temperature accuracy.
2. Supply voltage of 2.7 V to 5.5 V
3. Space-saving 6-lead SOT-23 package and 8-lead MSOP
package
4. 10-bit temperature reading to 0.25°C resolution
5. Standby mode that reduces the current consumption to 1 µA
REV. E
–2–
AD7814–SPECIFICATIONS
1
Parameter Min Typ Max Unit Test Conditions/Comments
TEMPERATURE SENSOR AND ADC
Accuracy ±2.0 °CT
A
= 0°C to 85°C. V
DD
= 3 V to 5.5 V
2
±2.5 °CT
A
= –40°C to 0°C. V
DD
= 3 V to 5.5 V
2
±2.0 ±3.5 °CT
A
= –55°C to +125°C. V
DD
= 3 V to 5.5 V
Resolution 10 Bits
Update Rate, t
R
400 µs
Temperature Conversion Time 25 µs
SUPPLIES
Supply Voltage 2.7 5.5 V For Specified Performance
Supply Current
Normal Mode 250 400 µA
Shutdown Mode (V
DD
= 5 V) 1.23 3 µA
Shutdown Mode (V
DD
= 3 V) 0.43 1 µA
Power Dissipation 80 µWV
DD
= 3 V. Using Normal Mode
Power Dissipation V
DD
= 3 V. Using Shutdown Mode
1 sps 3.7 µW
10 sps 3.9 µW
100 sps 5.8 µW
DIGITAL INPUT
3
Input High Voltage, V
IH
2.4 V
Input Low Voltage, V
IL
0.8 V
Input Current, I
IN
±1µAV
IN
= 0 V to V
DD
Input Capacitance, C
IN
10 pF All Digital Inputs
DIGITAL OUTPUT
3
Output High Voltage, V
OH
V
DD
– 0.3 V I
SOURCE
= I
SINK
= 200 µA
Output Low Voltage, V
OL
0.4 V I
OL
= 200 µA
Output Capacitance, C
OUT
50 pF
NOTES
1
All specifications apply for –55°C to +125°C unless otherwise stated.
2
For V
DD
= 2.7 V to 3 V and T
A
= –40°C to +85°C, the typical temperature error is ±2°C.
3
Guaranteed by design and characterization, not production tested.
Specifications subject to change without notice.
TIMING CHARACTERISTICS
1, 2, 3
Parameter Limit Unit Comments
t
1
0ns min CS to SCLK Setup Time
t
2
50 ns min SCLK High Pulse Width
t
3
50 ns min SCLK Low Pulse Width
t
44
35 ns max Data Access Time After SCLK Falling Edge
t
5
20 ns min Data Setup Time Prior to SCLK Rising Edge
t
6
0ns min Data Hold Time After SCLK Rising Edge
t
7
0ns min CS to SCLK Hold Time
t
84
40 ns max CS to DOUT High Impedance
NOTES
1
Guaranteed by design and characterization, not production tested.
2
All input signals are specified with tr = tf = 5 ns (10% to 90% of V
DD
) and timed from a voltage level of 1.6 V.
3
See Figure 2.
4
Measured with the load circuit of Figure 1.
Specifications subject to change without notice.
(TA = TMIN to TMAX, VDD = 2.7 V to 5.5 V, unless otherwise noted.)
(TA = TMIN to TMAX, VDD = 2.7 V to 5.5 V, unless otherwise noted.)
REV. E –3–
AD7814
ORDERING GUIDE
Temperature Temperature Package Package Branding
Model Range Error
1
Description Option Information
AD7814ART-500RL7 –55°C to +125°C±2°C6-Lead SOT-23 RT-6 CAA
AD7814ART-REEL –55°C to +125°C±2°C6-Lead SOT-23 RT-6 CAA
AD7814ART-REEL7 –55°C to +125°C±2°C6-Lead SOT-23 RT-6 CAA
AD7814ARTZ-500RL7
2
–55°C to +125°C±2°C6-Lead SOT-23 RT-6 CAA
AD7814ARTZ-REEL
2
–55°C to +125°C±2°C6-Lead SOT-23 RT-6 CAA
AD7814ARTZ-REEL7
2
–55°C to +125°C±2°C6-Lead SOT-23 RT-6 CAA
AD7814ARM –55°C to +125°C±2°C8-Lead MSOP RM-8 CAA
AD7814ARM-REEL –55°C to +125°C±2°C8-Lead MSOP RM-8 CAA
AD7814ARM-REEL7 –55°C to +125°C±2°C8-Lead MSOP RM-8 CAA
AD7814ARMZ
2
–55°C to +125°C±2°C8-Lead MSOP RM-8 CAA
AD7814ARMZ-REEL
2
–55°C to +125°C±2°C8-Lead MSOP RM-8 CAA
AD7814ARMZ-REEL7
2
–55°C to +125°C±2°C8-Lead MSOP RM-8 CAA
1
Temperature error is over 0°C to 85°C temperature range.
2
Z = Pb-free part
ABSOLUTE MAXIMUM RATINGS*
V
DD
to GND . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
Digital Input Voltage to GND . . . . . . . –0.3 V to V
DD
+ 0.3 V
Digital Output Voltage to GND . . . . . –0.3 V to V
DD
+ 0.3 V
Operating Temperature Range . . . . . . . . . . –55°C to +125°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . 150°C
SOT-23, Power Dissipation . . . . . . . . . . . . . . . . . . . . 450 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . 240°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . 215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C
MSOP Package, Power Dissipation . . . . . . . . . . . . . . 450 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . 206°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . 215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD7814 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
1.6V
IOL
200A
200AIOH
TO
OUTPUT
PIN CL
50pF
Figure 1. Load Circuit for Data Access Time and Bus
Relinquish Time
REV. E
AD7814
–4–
PIN FUNCTION DESCRIPTIONS
Pin SOT-23 MSOP
Mnemonic Pin No. Pin No. Description
GND 1 7 Analog and Digital Ground
DIN 2 6 Serial Data Input. Serial data to be loaded to the part’s control register is
provided on this input. Data is clocked into the control register on the rising
edge of SCLK.
V
DD
35 Positive Supply Voltage, 2.7 V to 5.5 V
SCLK 4 4 Serial Clock Input. This is the clock input for the serial port. The serial clock
is used to clock data out of the temperature value register of the AD7814 and
to clock data into the control register on the part.
CS 53 Chip Select Input. Logic input. The device is selected when this input is low.
The SCLK input is disabled when this pin is high.
DOUT 6 2 Serial Data Output. Logic output. Data is clocked out of the temperature
value register at this pin. Data is clocked out on the falling edge of SCLK.
NC 1, 8 No Connect
PIN CONFIGURATIONS
SOT-23
1
2
3
GND
TOP VIEW
(Not to Scale)
6
5
4
AD7814
DIN
VDD
DOUT
CS
SCLK
MSOP
TOP VIEW
(Not to Scale)
8
7
6
5
1
2
3
4
NC = NO CONNECT
NC
DOUT
CS
SCLK
NC
GND
DIN
VDD
AD7814
REV. E –5–
AD7814
CIRCUIT INFORMATION
The AD7814 is a 10-bit digital temperature sensor. The part
houses an on-chip temperature sensor, a 10-bit A/D converter,
a reference, and serial interface logic functions in a SOT-23
package. The A/D converter section consists of a conventional
successive-approximation converter based around a capacitor
DAC. The parts are capable of running on a 2.7 V to 5.5 V
power supply.
The on-chip temperature sensor allows an accurate measurement
of the ambient device temperature to be made. The working
measurement range of the AD7814 is –55°C to +125°C.
CONVERTER DETAILS
The conversion clock for the part is internally generated so no
external clock is required except when reading from and writing
to the serial port. In normal mode, an internal clock oscillator
runs the automatic conversion sequence. A conversion is initi-
ated approximately every 350 µs. At this time, the part wakes up
and performs a temperature conversion. This temperature con-
version typically takes 25 µs, at which time the part automati-
cally shuts down. The result of the most recent temperature
conversion is available in the serial output register at any time.
Once the conversion is finished, an internal oscillator starts
counting and is designed to time out every 350 µs. The AD7814
then powers up and does a conversion. Please note that if the
CS is brought low every 350 µs (±30%), then the same tempera-
ture value will be output onto the DOUT line every time with-
out changing. It is recommended that the CS line is not brought
low every 350 µs (±30%). The ±30% covers process variation.
The CS should become active (high to low) outside this range.
The device is designed to autoconvert every 350 µs. If the
AD7814 is accessed during the conversion process, an internal
signal is generated to prevent any update of the temperature
value register during the conversion. Otherwise the user could
read back spurious data. The design of this feature results in this
internal lockout signal being reset only at the start of the next
autoconversion. Therefore, if the CS line goes active before the
internal lockout signal has been reset to its inactive mode, the
internal lockout signal will not be reset. To ensure that no lock-
out signal is set, bring the CS low at a greater or less time than
350 µs (±30%). This will mean that the AD7814 is not inter-
rupted during a conversion process. The AD7814 can be placed
in a shutdown mode, via the control register, in which case the
on-chip oscillator is shut down and no further conversions are
initiated until the AD7814 is taken out of shutdown mode. The
conversion result from the last conversion prior to shutdown can
still be read from the AD7814 even when it is in shutdown mode.
In the automatic conversion mode, every time a read or write
operation takes place, the internal clock oscillator is restarted at
the end of the read or write operation. The result of the con-
version is typically available 25 µs later. Similarly, when the
part is taken out of shutdown mode, the internal clock oscil-
lator is restarted and the conversion result is typically available
25 µs later. Reading from the device before conversion is com-
plete will provide the same set of data.
TEMPERATURE VALUE REGISTER
The temperature value register is a read-only register that stores
the temperature reading from the ADC in 10-bit twos comple-
ment format. The temperature data format is shown in Table I.
This shows the full theoretical range of the ADC from –128°C
to +127°C, but in practice the temperature measurement range
is limited to the operating temperature range of the device (–55°C
to +125°C). A typical performance curve is shown in Figure 7.
Table I. Temperature Data Format
Digital Output
Temperature DB9 . . . DB0
–128°C10 0000 0000
–125°C10 0000 1100
–100°C10 0111 0000
–75°C10 1101 0100
–50°C11 0011 1000
–25°C11 1001 1100
–0.25°C11 1111 1111
0°C00 0000 0000
+0.25°C00 0000 0001
+10°C00 0010 1000
+25°C00 0110 0100
+50°C00 1100 1000
+75°C01 0010 1100
+100°C01 1001 0000
+125°C01 1111 0100
+127°C01 1111 1100
SERIAL INTERFACE
The serial interface on the AD7814 consists of four wires CS,
SCLK, DIN, and DOUT. The interface can be operated in
3-wire mode with DIN tied to Ground, in which case the inter-
face has read-only capability, with data being read from the data
register via the DOUT line. The DIN line is used to write the part
into standby mode, if required. The CS line is used to select the
device when more than one device is connected to the serial
clock and data lines.
The part operates in a slave mode and requires an externally
applied serial clock to the SCLK input to access data from the
data register. The serial interface on the AD7814 is designed to
allow the part to be interfaced to systems that provide a serial
clock that is synchronized to the serial data, such as the 80C51,
87C51, 68HC11, 68HC05, and PIC16Cxx microcontrollers, as
well as DSP processors.
A read operation from the AD7814 accesses data from the
temperature value register, while a write operation to the part
writes data to the control register.
REV. E
AD7814
–6–
Read Operation
Figure 2 shows the timing diagram for a serial read from the
AD7814. The CS line enables the SCLK input. Ten bits of data
and a leading zero are transferred during a read operation. Read
operations occur during streams of 16 clock pulses. The serial
data is accessed in a number of bytes if 10 bits of data are being
read. At the end of the read operation, the DOUT line remains
in the state of the last bit of data clocked out of the AD7814
until CS returns high, at which time the DOUT line goes into
three-state.
Write Operation
Figure 2 also shows the timing diagram for a serial write to the
AD7814. The write operation takes place at the same time as
the read operation. Data is clocked into the control register on
the part on the rising edge of SCLK. Only the third bit in the
data stream provides a user-controlled function. This third bit is
the power-down bit which, when set to a 1, puts the AD7814
into shutdown mode. The first 2 bits of the data stream are
“don’t cares” while all other bits in the data stream, other than
the power-down bit, should be 0 to ensure correct operation of
the AD7814. Data is loaded to the control register on the fif-
teenth falling SCLK edge and the data takes effect at this time
(i.e., if the part is programmed to go into shutdown, it does so
at this point). If the CS is brought high before this fifteenth SCLK
edge, the control register will not be loaded and the power-down
status of the part will not change.
MICROPROCESSOR INTERFACING
The AD7814’s serial interface allows for easy interface to most
microcomputers and microprocessors. Figures 3 through 6 show
some typical interface circuits.
The serial interface on the AD7814 consists of four wires: CS,
DIN, DOUT, and SCLK. All interface circuits shown utilize all
four interface lines. However, it is possible to operate the inter-
face with three wires. If the application does not require the
power-down facility offered by the AD7814, the DIN line can
be tied permanently low. Thus, the interface can be operated
from just three wires: SCLK, CS, and DOUT.
The serial data transfer to and from the AD7814 requires a
16-bit read operation. Many 8-bit microcontrollers have 8-bit
serial ports and this 16-bit data transfer is handled as two 8-bit
transfers. Other microcontrollers and DSP processors transfer
16 bits of data in a serial data operation.
CS
SCLK
DOUT
DIN DON'T
CARE
DON'T
CARE
POWER-
DOWN
LEADING
ZERO DB9 DB8 DB0
1234 11 15 16
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
Figure 2. Serial Interface Timing Diagram
AD7814 to MC68HC11 Interface
Figure 3 shows an interface between the AD7814 and the
MC68HC11 microcontroller. The MC68HC11 is configured in
the master mode with its CPOL bit set to a logic one and its
CPHA bit set to a logic one. When the MC68HC11 is config-
ured like this, its SCLK line idles high between data transfers.
Data is transferred to and from the AD7814 in two 8-bit serial
data operations. The diagram shows the full (4-wire) interface.
PC1 of the MC68HC11 is configured as an output and used to
drive the CS input.
AD7814*
SCLK
DOUT
DIN
CS
MC68HC11*
SCLK
MISO
MOSI
PC1
*ADDITIONAL PINS OMITTED FOR CLARITY
Figure 3. AD7814 to MC68HC11 Interface
AD7814 to 8051 Interface
An interface circuit between the AD7814 and the 8051 micro-
controller is shown in Figure 4. The 8xC51 is configured in its
Mode 0 serial interface mode. The serial clock line of the 8xC51
(on P3.1) idles high between data transfers. Data is transferred
to and from the AD7814 in two 8-bit serial data operations. The
AD7814 outputs the MSB of its data stream as the first valid
bit while the 8xC51 expects the LSB first. Thus, the data read
into the serial buffer needs to be rearranged before the correct
data word from the AD7814 is available in the accumulator.
In the example shown, the AD7814 is connected to the serial
port of the 8051. Because the serial interface of the 8xC51 con-
tains only one data line, the DIN line of the AD7814 is tied low
in the interface example given in Figure 4.
For applications that require the use of the power-down feature
of the AD7814, the serial interface should be implemented
using data port lines on the 8051. This allows a full-duplex
serial interface to be implemented. The method involves ‘bit-
banging’ a port line to generate a serial clock while using two
other port lines to shift data in and out with the fourth port line
connecting to CS. Port lines 1.0 through 1.3 (with P1.1 config-
ured as an input) can be used to connect to SCLK, DOUT,
DIN, and CS, respectively, to implement this scheme.
REV. E –7–
AD7814
AD7814*
SCLK
DOUT
DIN
CS
8051*
P3.1
P3.0
P1.2
P1.3
*ADDITIONAL PINS OMITTED FOR CLARITY
Figure 4. AD7814 to 8051 Interface
AD7814 to PIC16C6x/7x Interface
Figure 5 shows an interface circuit between the AD7814 and the
PIC16C6x/7x microcontroller. The PIC16C6x/7x synchronous
serial port (SSP) is configured as an SPI master with the clock
polarity bit set to a logic one. In this mode, the serial clock line
of the PIC16C6x/7x idles high between data transfers. Data is
transferred to and from the AD7814 in two 8-bit serial data
operations. In the example shown, port line RA1 is being used
to generate the CS for the AD7814.
AD7814*
SCLK
DOUT
DIN
CS
PIC16C6x/7x*
SCK
SDO
SDI
RA1
*ADDITIONAL PINS OMITTED FOR CLARITY
Figure 5. AD7814 to PIC16C6x/7x Interface
AD7814 to ADSP-21xx Interface
Figure 6 shows an interface between the AD7814 and the
ADSP-21xx DSP processor. To ensure correct operation of the
interface, the SPORT control register should be set up as follows:
TFSW = RFSW = 1, Alternate Framing
INVRFS = INVTFS = 1, Active Low Framing Signal
DTYPE = 00, Right Justify Data
SLEN = 1111, 16-Bit Data Words
ISCLK = 1, Internal Serial Clock
TFSR = RFS = 1, Frame Every Word
IRFS = 0, RFS Configured As Input
ITFS = 1, TFS Configured As Output
The interface requires an inverter between the SCLK line of the
ADSP-21xx and the SCLK input of the AD7814. The ADSP-
21xx has the TFS and RFS of the SPORT tied together with
TFS set as an output and RFS set as an input. The DSP operates
in alternate framing mode and the SPORT control register is set
up as described earlier.
AD7814*
SCLK
DOUT
DIN
CS
ADSP-21xx*
SCK
DR
DT
RFS
*ADDITIONAL PINS OMITTED FOR CLARITY
TFS
Figure 6. AD7814 to ADSP-21xx Interface
MOUNTING THE AD7814
The AD7814 can be used for surface or air temperature sensing
applications. If the device is cemented to a surface with ther-
mally conductive adhesive, the die temperature will be within
about 0.1°C of the surface temperature, thanks to the device’s
low power consumption. Care should be taken to insulate the
back and leads of the device from the air, if the ambient air
temperature is different from the surface temperature being
measured.
The ground pin provides the best thermal path to the die, so the
temperature of the die will be close to that of the printed circuit
ground track. Care should be taken to ensure that this is in good
thermal contact with the surface being measured.
As with any IC, the AD7814 and its associated wiring and cir-
cuits must be kept free from moisture to prevent leakage and
corrosion, particularly in cold conditions where condensation is
more likely to occur. Water-resistant varnishes and conformal
coatings can be used for protection. The small size of the
AD7814 package allows it to be mounted inside sealed metal
probes, which provide a safe environment for the device.
SUPPLY DECOUPLING
The AD7814 should be decoupled with a 0.1 µF ceramic
capacitor between V
DD
and GND. This is particularly important
if the AD7814 is mounted remotely from the power supply.
TEMPERATURE – C
–0.4
–55
TEMPERATURE ERROR
–0.2
0
0.2
0.4
0.6
0.8
1.0
–40 0 25 40 85 100 120
Figure 7. Typical Temperature Error
REV. E
AD7814
–8–
C01041–0–8/04(E)
OUTLINE DIMENSIONS
6-Lead Small Outline Transistor Package [SOT-23]
(RT-6)
Dimensions shown in millimeters
1 3
4 5
2
6
2.90 BSC
1.60 BSC 2.80 BSC
1.90
BSC
0.95 BSC
0.22
0.08
10
4
0
0.50
0.30
0.15 MAX
1.30
1.15
0.90
SEATING
PLANE
1.45 MAX
0.60
0.45
0.30
PIN 1
INDICATOR
COMPLIANT TO JEDEC STANDARDS MO-178AB
8-Lead Mini Small Outline Package [MSOP]
(RM-8)
Dimensions shown in millimeters
0.80
0.60
0.40
8
0
85
4
1
4.90
BSC
PIN 1
0.65 BSC
3.00
BSC
SEATING
PLANE
0.15
0.00
0.38
0.22
1.10 MAX
3.00
BSC
COPLANARITY
0.10
0.23
0.08
COMPLIANT TO JEDEC STANDARDS MO-187AA
Revision History
Location Page
8/04—Data Sheet Changed from REV. D to REV. E.
Changes to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Changes to CONVERTER DETAILS section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Changes to Read Operation section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5/02—Data Sheet Changed from REV. C to REV. D.
Updates to SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2