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PmodWiFi™ Reference Manual
Revised January 7, 2015
This manual applies to the PmodWiFi rev. B
DOC#: 502-194
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 1 of 2
Overview
The PmodWiFi is an interface board for the Microchip® MRF24WB0MA Wi-Fi™ radio transceiver module.
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.
The PmodWiFi.
IEEE 802.11-compliant RF transceiver
Serialized unique MAC address
Data rate: 1 and 2Mbps
IEEE 802.11b/g/n-compatible
Integrated PCB antenna
Range: up to 400m (1300 ft.)
Radio regulation certification for the United
States (FCC), Canada (IC), Europe (ETSI), and
Japan (ARIB)
Wi-Fi certified (WFA ID: WFA7150)
Features include:
PmodWiFi™ Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 2 of 2
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.
