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1300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodIOXP™ Reference Manual Revised May 23, 2013 This manual applies to the PmodIOXP rev. A Overview The Digilent PmodIOXP is an Input/Output Expansion module capable of providing up to 19 additional IO pins. Features include:         Communicates via the I²C interface 16-element FIFO for event recording 19 configurable I/Os Built-in keypad decoding for matrices up to 11×8 PWM generator Open-drain interrupt output Two programmable logic blocks Debouncing on I/Os The PmodIOXP. 1 Functional Description The PmodIOXP utilizes Analog Devices' ADP5589. Through the use of I²C, users may expand from the two I/O pins required to nearly 10 times the amount of available I/O. 2 Interfacing with the Pmod The PmodIOXP communicates with the host board via the I²C protocol. By sending out the 7-bit slave address of 0110100 and a read or write bit (1/0), users may then read or write to a specific register to configure the Pmod to enable interrupts or read the status of GPIO pins. DOC#: 502-219 Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners. Page 1 of 2 PmodIOXP™ Reference Manual 2.1 Pinout Description Table Pin 1&5 2&6 3&7 4&8 Signal SCL SDA GND VCC Description Serial Clock Serial Data Power Supply Ground Power Supply (3.3V/5V) Any external power applied to the PmodIOXP must be within 1.65V and 3.6V; it is recommended that Pmod is operated at 3.3V. 3 Physical Dimensions The pins on the pin header are spaced 100 mil apart. The PCB is 1.3 inches long on the sides parallel to the pins on the pin header and 2.3 inches long on the sides perpendicular to the pin header. Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners. Page 2 of 2