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Summary of content (11 pages)

PAGE 1
MAXREFDES72#: Quick Start Guide Required Equipment • • • • Device with a modern web browser and the ability to write to an external USB drive Microcontroller board with Arduino® UNO R3-‐compatible socket headers MAXREFDES72# board MAX3232PMB1 or other Pmod™-‐compatible peripheral module, available here Overview This Quick Start Guide explains how to co
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+3.3V +3.3V IOREF +3.3V NC IOREF RST# +3.3V +5V GND GND VIN IOREF SCL SDA GND IOREF SCL SDA IOREF VL VCC MAX14611 TS# GND VL VCC 6 5 4 3 2 1 A 6 5 4 3 2 1 B PB4 PB3 PB2 PB1 TP0 TP1 TP2 TP3 TP4 TP5 MAX14611 TS# IOREF SCL SDA GND IOREF GND D13 D12 D11 D10 D9 D8 D15 D14 NC GND D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 AB16 AB15 AB14 AB13 AB12 AB11 AB10 COMB AB09 AB08 COMA AB07 AB06 AB05 AB04 AB03 AB02 AB01 A0 A1 A2 A3 A4 A5 +3.
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Procedure This is an example of how to configure the multiplexer using the mbed platform. 1. Connect hardware as shown in Figure 1. 2. Select an mbed enabled board with Arduino headers. See Appendix C: mbed Enabled Board Compatibility for known compatibility issues. 3. From the platform page for the selected platform, click Open mbed Compiler.
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Appendix A: Multiplexer Connections MAX14661 SW01 SW02 SW03 SW04 SW05 SW06 SW07 SW08 SW09 SW10 SW11 SW12 SW13 SW14 SW15 SW16 Arduino D0 D1 D2 D3 D4 D5 D6 D7 D15 (SCL) D14 (SDA) D13 D12 D11 D10 D9 D8 Pmod PB1 PB2 PB3 PB4 PA4 PA3 PA2 PA1
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• • This board does not have a dedicated mbed interface chip, but uses the USB bootloader in the LPC11U24 ROM. The lack of a dedicated mbed interface chip means USBRX and USBTX are not present and the firmware update procedure is different. This prevents the included MAX3232 demonstration code from functioning with this board.
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Appendix E: MAX14661 Library MAX14661.h #ifndef MAX14661_H #define MAX14661_H #include "mbed.h" /** MAX14661 Library, Provides utilities for configuring the MAX14661 over I2C * * Example: * @code * // Enable only switch B3 and read back switch state. * * #include "MAX14661.h" * * MAX14661 mux(p28, p27); * * int main() { * mux.setAB(0x0000, MAX14661::SW03); * printf("mux = 0x%08X\n", mux.read()); * mux.clearAll(); * printf("mux = 0x%08X\n", mux.
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/** Name the command codes */ enum MAX14661cmds { CMD_EN01 = 0x00, /**< Enable switch 1 */ CMD_EN02, /**< Enable switch 2 */ CMD_EN03, /**< Enable switch 3 */ CMD_EN04, /**< Enable switch 4 */ CMD_EN05, /**< Enable switch 5 */ CMD_EN06, /**< Enable switch 6 */ CMD_EN07, /**< Enable switch 7 */ CMD_EN08, /**< Enable switch 8 */ CMD_EN09, /**< Enable switch 9 */ CMD_EN10, /**< Enable switch 10 */ CMD_EN11, /**< Enable switch 11 */ CMD_EN12, /**< Enable switch 12 */ CMD_EN13, /**< Enable switch 13 */ CMD_
PAGE 8
/** Read the status of all 32 switches concatenated into a single int * * @returns * the switch states [B16-B01,A16-A1] */ int read(); private: I2C _i2c; int _addr; }; #endif MAX14661.cpp #include "MAX14661.h" #include "mbed.h" MAX14661::MAX14661(PinName sda, PinName scl, int addr) : _i2c(sda, scl) { _addr = addr; } MAX14661::~MAX14661() { } void MAX14661::clearAll() { char data[3]; data[0] = REG_CMD_A; data[1] = CMD_DIS; data[2] = CMD_DIS; _i2c.
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_i2c.write(_addr, data, 1, true); _i2c.read(_addr, data, 4); return ((data[3] << 24) | (data[2] << 16) |(data[1] << 8) | data[0]); } ARDUINO Appendix F: Arduino Variant Pin Mapping Arduino UNO R3 ATmega328 SCL SDA NC +5V RESET +3.3V +5V GND GND VIN PWM PWM SCK MISO MOSI SS PWM PC5 PC4 AREF GND PB5 PB4 PB3 PB2 PB1 PB0 PD7 PD6 PD5 PD4 PD3 PD2 PD1 PD0 PWM PWM PC0 PC1 PC2 PC3 PC4 PC5 Analog In SDA SCL PWM TX RX Seeeduino Arch LPC11U24 SCL SDA P0_23 +3.3V RESET +3.
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Trademarks Arduino is a registered trademark of Arduino, LLC. Digilent is a registered trademark and Pmod™ is a trademark of Digilent Inc. Pmod is a trademark of Diligent Inc. Windows is a registered trademark and registered service mark of Microsoft Corporation.
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Revision History REV NUMBER 0 DATE 7/14 DESCRIPTION Initial release PAGES CHANGED —