Pmod WiFi Reference Manual

The Digilent Pmod WiFi (Revision B) provides WiFi 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.

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Features

  • 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
  • 12-pin Pmod connector with SPI interface

Functional Description

The Pmod WiFi 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 2 Mbps. It is designed for use with Microchip microcontroller families (PIC18, PIC24, dsPIC33, and PIC32) and the Microchip TCP/IP Stack available at www.microchip.com/wireless.


Interfacing with the Pmod

The Pmod WiFi communicates with the host board using SPI. A active low hardware reset pin pin 8 is provided for the host board to reset the Pmod WiFi. Additionally, an active low interrupt pin 7 is provided to allow the Pmod WiFi signal to the host board when data is available for the host device and to signal when the data transfer has been completed.

Pinout Description Table

Pin Signal Description Pin Signal Description
1 CS Chip select 7 INT Interrupt
2 SDI SPI master 8 RESET Reset
3 SDO SPI slave 9 WP Write-protected
4 SCK Serial clock 10 HIBERNATE Hibernate
5 GND Power Supply Ground 11 GND Power Supply Ground
6 VCC Power Supply (3.3V/5V) 12 VCC Power Supply (3.3V/5V)

Any external power applied to the Pmod must be within 2.5V and 5.5V; however, it is recommended that Pmod is operated at 3.3V.


Physical Dimensions

The pins on the pin header are spaced 100 mil apart. The PCB is 1.7 inches long on the sides parallel to the pins on the pin header and 1.0 inches long on the sides perpendicular to the pin header.


Additional Information

The schematics of the Pmod WiFi are available here. Additional information about the MRF24WG0MA including communication modes and specific timings of the chip can be found by checking out its datasheet here.

Some fundamentals on how to use the Pmod WiFi with Digilent's Network IP Stack can be found here. Example code demonstrating how to get information from the Pmod WiFi can be found here.

If you have any questions or comments about the Pmod WiFi, feel free to post them under the appropriate section (“Add-on Boards”) of the Digilent Forum.