Evaluates: MAXQ622
MAXQ622 Evaluation Kit
General Description
The MAXQ622 evaluation kit (EV kit) provides a
proven platform for conveniently evaluating the
capabilities of the MAXQ622 low-power, 16-bit, RISC
microcontroller with USB interface targeted for battery-
powered applications. The EV kit includes the MAXQ622
EV kit board, which contains infrared (IR) transmit
and receive devices, a USB Mini-B interface, headers
providing access to the processor’s I/O port pins, a
single 5V power-supply input, and a bank of eight
pushbutton switches for user input. With the included
software, USB-to-JTAG adapter, and a USB cable
connected to a personal computer, the EV kit provides
a complete, functional system ideal for developing and
debugging applications as well as evaluating the overall
capabilities of the MAXQ622 RISC processor.
EV Kit Contents
S MAXQ622 EV Kit Board
S MAXQ USB-to-JTAG/1-Wire Adapter
(MAXQUSBJTAGOW-KIT)
S JTAG Interface Cable
Features
S Easily Load and Debug Code Using Supplied
USB-to-JTAG Adapter
S JTAG Interface Provides In-Application
Debugging Features
Step-by-Step Execution Tracing
Breakpointing by Code Address or Data Memory
Address
Data Memory or Register Content View and Edit
S On-Board 3.3V Voltage Regulator (Powered from
5V Input, JTAG, or USB)
S Eight User-Input Pushbutton Switches
S USB Mini-B Connector Provides Access to
MAXQ622 USB Interface and Transceiver
S Prototyping Area
S Included Board Schematics Provide a Convenient
Reference Design
Ordering Information
Component List
19-5209; Rev 3; 9/14
IAR Embedded Workbench is a registered trademark of IAR
Systems AB.
MAXQ is a registered trademark of Maxim Integrated
Products, Inc.
#Denotes an RoHS-compliant device that may include
lead(Pb), which is exempt under the RoHS requirements.
PART TYPE
MAXQ622-KIT# EV Kit
DESIGNATION QTY DESCRIPTION
C1, C3, C10,
C16 4100nF, 10V ceramic capacitors
(0603)
C2, C6, C9,
C11 41.0FF, 10V ceramic capacitors (0603)
C4, C5 2
43pF Q5%, 50V ceramic capacitors
(0603)
Murata GRM1885C1H430JA01D
C7, C8 2
18pF Q5%, 50V ceramic capacitors
(0603)
KEMET C0603C180J5GACTU
C12 1 4.7FF, 10V ceramic capacitor (0805)
C13, C14 22.2FF, 10V ceramic capacitors (0805)
C15 1 10nF, 10V ceramic capacitor (0603)
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
2 Maxim Integrated
Evaluates: MAXQ622
MAXQ622 Evaluation Kit
Component List (continued)
DESIGNATION QTY DESCRIPTION
CN1 1 USB Mini-B connector
Tyco Electronics 1734035-2
D1 1 High-power AlGaAS IR (870nm) LED
Lite-On IT HSDL-4261
D2 1 PIN photodiode 60N
Lite-On IT ASDL-5270-D22
D3 1 6.4V, 200W Zener diode
ON Semiconductor SMF5.0AT1G
D4, D5, D6 31A, 200V standard recovery diodes
Diodes Inc. DFLR1200-7
DS1–DS4 4
Surface-mount, 660nm, red LEDs
(1206)
Lumex SML-LX1206SRC-TR
DS5 1
Surface-mount, 590nm, yellow LED
(1206)
Lumex SML-LX1206SYC-TR
FB1 1 Surface-mount ferrite bead (1206)
Laird Technologies HZ1206C202R-10
F1 1 Fast-acting 500mA PICO-SMD fuse
Littelfuse, Inc. 0459.500UR
J2 1
2.5mm power jack, through-hole
mount
CUI Inc. PJ-102B
JH1–JH7,
JH10, JH11 91 x 2 header pins, 0.100in spaced
Sullins PEC02SAAN
JH8, JH9 21 x 3 header pins, 0.100in spaced
Sullins PEC03SAAN
P0–P5 6 1 x 8 header pins, 0.100in spaced
Sullins PEC08SAAN
P6, P8, P9 31 x 6 header pins, 0.100in spaced
Sullins PEC06SAAN
P7 1
2 x 5 header pin (JTAG connector),
0.100in-spaced dual row
Sullins PEC05DAAN
DESIGNATION QTY DESCRIPTION
P10 1 1 x 3 header pin, 0.100in spaced
Sullins PEC03SAAN
Q1 1
General-purpose small-signal npn
transistor (40V, 200mA TO-92)
ON Semiconductor 2N3904G
R1 1 82I Q5%, 1/4W SMD resistor (1206)
R2–R5, R9 5180I Q5%, 1/10W SMD resistors
(0603)
R6 1 3.32kI Q5%, 1/10W SMD resistor
(0603)
R7 1 10kI Q5%, 1/10W SMD resistor
(0603)
R8 1 2I Q1%, 1/10W SMD resistor (0603)
R10 1 10I Q1%, 1/10W SMD resistor (0603)
SW1–SW9 9
SPST normally open pushbutton
switches
OMRON Corp. B3FS-1000
TP1–TP15 15 Single-pin test points
U1 1
Microcontroller with infrared module
and USB (64 LQFP)
Maxim MAXQ622G-0000+
U2 1
+3.3V fixed-output LDO linear
regulator (5 SOT23)
Maxim MAX8887EZK33+
U3 1
Dual-channel high-speed ESD pro-
tector (6 SOT23)
Maxim MAX3207EAUT-T
XU1 — Socket (not populated)
Y1 1
Fundamental-mode 18pF, 12MHz
crystal
ECS, Inc. ECS-120-18-4VX
— 1 PCB: MAXQ622 Eval Kit, REV B
3Maxim Integrated
Evaluates: MAXQ622
MAXQ622 Evaluation Kit
Figure 1. MAXQ622 EV Kit Board
4 Maxim Integrated
Evaluates: MAXQ622
MAXQ622 Evaluation Kit
Detailed Description of Hardware
This EV kit must be used with the following documents:
• MAXQ612/MAXQ622 IC Data Sheet
• MAXQ612/MAXQ622 User’s Guide
• MAXQ622 EV Kit Data Sheet (this document)
These documents are available online at:
www.maximintegrated.com/MAXQ622
The MAXQ622 EV kit is fully defined in the schematic
(Figure 3). A short description of the major sections and
functions of the board follows.
Power Supply
The MAXQ622 EV kit can be powered directly using
an external DC power supply applied to connector J2.
A regulated 5V (Q5%), 300mA, center positive, 2.5mm
power supply is required. The EV kit includes a regulator
to supply 3.3V power to its circuitry.
Figure 2. MAXQ622 EV Kit Board Functional Layout
5Maxim Integrated
Evaluates: MAXQ622
MAXQ622 Evaluation Kit
If the USB-to-JTAG interface adapter is being used, the
EV kit is supplied by the USB 5V power, which is avail-
able to the USB-to-JTAG adapter.
Power can also be supplied to the MAXQ622 EV kit
through the MAXQ622 microcontroller’s USB interface.
When a powered USB cable is plugged into CN1, con-
necting jumper JH10 allows the on-board +3.3V regula-
tor to be powered directly from the USB supply.
Infrared (IR) Interface
The MAXQ622 microcontroller provides a dedicated IR
timer/counter module to simplify support for IR com-
munication. The IR timer/counter implements two pins
(IRTX and IRRX) for supporting IR transmit and receive,
respectively. The IRTX output pin can be manipulated
high or low using the IRTXOUT bit of the power control
register (PWCN) when the IRTX function is not enabled.
However, the IRTX pin has no corresponding port pin
designation, so the standard port direction (PD), port
output (PO), and port input (PI) control status bits are
not present.
The MAXQ622 EV kit includes circuitry for both receiv-
ing and transmitting IR signals. The IR source is diode
D1. Its anode is connected to the board’s VDD supply
through an 82I resistor, and its cathode is connected to
the MAXQ622’s IRTX pin when jumper JH2 is installed.
The IR receiving circuitry consists of silicon PIN photodi-
ode (D2) and an npn bipolar transistor (Q1) with biasing
resistors. The photodiode (D2) is intended for IR applica-
tions in the 700nm to 1100nm range, and the transistor is
configured as a common emitter amplifier for the diode.
Its collector is connected to the processor’s IRRX pin
(when JH6 is installed), and the emitter is connected
to the processor’s P0.7 (TBB1) pin when jumper JH7 is
installed. This allows the processor’s port pin to be used
as an IR receiver-enable signal.
General-Purpose Diodes
The MAXQ622 EV kit has four general-purpose LEDs
labeled DS1, DS2, DS3, and DS4. Each anode is con-
nected to the board’s VDD through a 180I resistor, and
each cathode is connected to a processor port 3 pin
through a jumper as specified in Table 1. By setting the
related port pin as an output, each LED can be illumi-
nated by setting the port pin output register bit (PO3.n)
to a logic 0.
Jumper Functions
The MAXQ622 EV kit contains a number of jumpers to
configure its operation. Table 2 shows the jumpers and
their functions.
Table 1. General-Purpose LED Connections
Table 2. Jumper Functions
LED JUMPER PORT PIN
DS1 JH1 P3.0
DS2 JH3 P3.1
DS3 JH4 P3.2
DS4 JH5 P3.3
NAME DESCRIPTION
JH1 Connects the board’s DS1 LED cathode to the MAXQ622’s port pin P3.0.
JH2 Connects the board’s D1 IR LED cathode to the MAXQ622’s IRTX pin.
JH3 Connects the board’s DS2 LED cathode to the MAXQ622’s port pin P3.1.
JH4 Connects the board’s DS3 LED cathode to the MAXQ622’s port pin P3.2.
JH5 Connects the board’s DS4 LED cathode to the MAXQ622’s port pin P3.3.
JH6 Connects the IR receiver interface transistor’s collector to the MAXQ622’s IRRX pin.
JH7 Connects the IR receiver interface transistor’s emitter (IR receiver enable) to the MAXQ622’s port pin P0.7.
JH8 With pins 1 and 2 connected, powers the MAXQ622’s VBUS supply from the USB VBUS supply (connected at CN1).
With pins 2 and 3 connected, powers the MAXQ622’s VBUS supply from the +5.0V DC supply connected at J2.
JH9
Connect pins 1 and 2 to power the MAXQ622’s VDD supply from the output of the +3.3V fixed regulator. To power the
MAXQ622 from a bench supply, disconnect the jumper from JH9 and connect the supply to JH9.2 (power) and JH9.3
(ground).
JH10 Connects the USB VBUS supply (from CN1) to the input to the +3.3V regulator.
JH11 When connected, the DS5 power LED lights when power is available at the input to the +3.3V regulator. When
disconnected, the DS5 power LED is disabled.
6 Maxim Integrated
Evaluates: MAXQ622
MAXQ622 Evaluation Kit
User Input Pushbuttons
The MAXQ622 EV kit provides eight momentary contact
switches intended for user input. Each switch is con-
nected to a separate port pin on the MAXQ622’s port 1
(P1.7 to P1.0) as shown in Table 3. The other side of
each switch is connected to ground. Therefore, by using
the weak pullup capability of the port pins, switch clo-
sure can be detected by reading a low on the normally
high corresponding port pin.
JTAG Interface
A USB-to-JTAG adapter (provided with the EV kit) is
used to program and debug applications running on the
MAXQ622 EV kit. Connect the 10-pin ribbon cable from
the JTAG board’s J2 connector to connector P7 on the
MAXQ622 EV kit board, being careful to note the polarity.
Tools such as the Microcontroller Tool Kit (MTK) and IAR
Embedded Workbench have built-in support for loading
applications through the JTAG interface and using all the
MAXQ622 debug functionality (breakpoints, register and
memory reading, etc.).
Table 3. Switch Input Connections
PORT PIN SWITCH
P1.0 SW1
P1.1 SW2
P1.2 SW3
P1.3 SW4
P1.4 SW5
P1.5 SW6
P1.6 SW7
P1.7 SW8
7Maxim Integrated
Evaluates: MAXQ622
MAXQ622 Evaluation Kit
Figure 3a. MAXQ622 EV Kit Schematic (Sheet 1 of 2)
8 Maxim Integrated
Evaluates: MAXQ622
MAXQ622 Evaluation Kit
Figure 3b. MAXQ622 EV Kit Schematic—Pushbuttons (Sheet 2 of 2)
Evaluates: MAXQ622
MAXQ622 Evaluation Kit
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 4/10 Initial release —
1 5/10 Changed the part number in the Ordering Information table (RoHS compliant) 1
2 6/14 Removed references to CD; no longer shipping CD with EV kit package 1, 4
3 9/14 Changed references from USB-to-JTAG board to USB-to-JTAG adapter and
replaced Figure 2 1, 4–6
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 9
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