DIGILENT PmodWiFi User Manual
- June 12, 2024
- DIGILENT
Table of Contents
DIGILENT PmodWiFi
Product Information
- Product Name: PmodWiFi
- Revision: B
- Manufacturer: Digilent, Inc.
- Model Number: N/A
- Website: www.digilentinc.com
Features:
- IEEE 802.11-compliant RF transceiver
- Supports data rates of 1 and 2 Mbps
- Transmission range of up to 400 m
- Serialized unique MAC address
- Integrated PCB antenna
- Radio regulation certification for the US, Specification Type 2A
- Libraries available in resource center
Product Usage Instructions
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.
1.1 Interface:
The primary communications interface with the PmodWiFi is an SPI bus. The PmodWiFi also provides an active low interrupt indicator pin (~INT) and an RST pin for hardware reset.
Interface Connector Pinout:
| 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) |
Power Supply:
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. Ensure that the system board is jumpered to provide 3.3V to the module before applying power to the board.
For more information, refer to the MRF24WB0MA datasheet available on Microchip’s website.
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
- Libraries available in resource center
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.
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.
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).
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.
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