1300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodWiFi Reference Manual Revised May 24, 2016 This manual applies to the PmodWiFi rev. B Overview The PmodWiFi provides Wi-Fi access through the Microchip MRF24WG0MA Wi-Fi radio transceiver module. Users can communicate with the IEEE 802.11g compliant chip through SPI and achieve data rates up to 54 Mbps. Features include: IEEE 802.11-compliant RF transceiver Send data at 1 and 2 Mbps up to 400 m Serialized unique MAC address Integrated PCB antenna Radio regulation certification for the US, Canada, Europe and Japan Wi-Fi certified Small PCB size for flexible designs 1.7 1.0 (4.3 cm 2.0 cm) 12-pin Pmod connector with SPI interface Follows Digilent Pmod Interface Specification Type 2A The PmodWiFi. Libraries available in resource center 1 Functional Description The PmodWiFi provides IEEE 802.11b/g/n support for embedded applications at data rates of 1 and 2Mbps. It is designed for use with Microchip microcontroller families (PIC18, PIC24, dsPIC33, and PIC32) and the Microchip TCP/IP Stack (a free Microchip Application Libraries download including example applications and source code). The TCP/IP Stack is available at www.microchip.com/wireless. 1.1 Interface The primary communications interface with the PmodWiFi is an SPI bus. An RST pin provides the host with an active low, asynchronous hardware reset for the PmodWiFi. The PmodWiFi also provides an active low interrupt indicator pin (~INT), which is asserted low by the PmodWifi when data is available for the host device. The ~INT line is de-asserted high after the data transfer is complete. The SPI SCK speed can be up to 25 MHz. Copyright Digilent, Inc. All rights reserved. DOC : 502-194 Page 1 of 2 Other product and company names mentioned may be trademarks of their respective owners. PmodWiFi Reference Manual Connector J1 SPI Communications Pin Signal Description 1 ~SS Slave Select 2 MOSI Master out/Slave in Data 3 MISO Master in/Slave out Data 4 SCK Serial Clock 5 GND Power Supply Ground 6 VCC Power Supply (3.3V) 7 ~INT Interrupt Output 8 ~RST Hardware Reset 9 ~WP Write Protect 10 HIB Hibernate 11 GND Power Supply Ground 12 VCC Power Supply (3.3V) Interface connector signal description. The SPI interface standard uses four signal lines. These are slave select (~SS), master out slave in (MOSI), master in slave out (MISO), and serial clock (SCK). These signals map to the following signals on the MRF24WB0MA: ~SS corresponds to the Chip Select signal (~CS), MOSI corresponds to Serial Data Input (SDI), MISO corresponds to Serial Data Output (SDO), and SCK corresponds to the Serial Clock signal (SCK). 1.2 Power Supply The PmodWiFi is designed to work with Digilent microcontroller boards that have 12-pin header connectors. The PmodWiFi requires a 2.7V-3.6V supply voltage. A 3.3V power supply voltage is available on all Digilent system boards and is provided as part of the 12-wire Pmod interface standard. Digilent system boards with Pmod interface connectors allow jumper selection of the power supply voltage being provided to the Pmod. Ensure that the system board is jumpered to provide 3.3V to the module before applying power to the board. For more information on the MRF24WB0MA, see the MRF24WB0MA datasheet which can be accessed on Microchip s website. Copyright Digilent, Inc. All rights reserved. Page 2 of 2 Other product and company names mentioned may be trademarks of their respective owners.