PmodRF2 Reference Manual PmodRF2 Reference Manual Revision: May 09, 2011 1300 NE Henley Court, Suite 3 Note: This document applies to REV A of the board. Pullman, WA 99163 (509) 334 6306 Voice (509) 334 6300 Fax Overview The PmodRF2 is an interface board for the Microchip MRF24J40 IEEE 802.15.4 2.4GHz RF transceiver module. The PmodRF2 can add RF communication to any Digilent system board. Features include: IEEE 802.15-compliant RF transceiver supports ZigBee , MiWi, MiWi P2P and proprietary wireless networking protocols ISM band 2.405-2.48GHz operation Interface Connector Signal Description simple SPI communication interface integrated 20MHz and 32.768 oscillator Connector J1 SPI Communications circuitry Pin Signal Description 1 ~CS Chip Select Functional Description 2 SDI Serial Data In 3 SDO Serial Data Out The PmodRF2 provides RF support for 4 SCK Serial Clock applications at data rates of 250kbps (IEEE 5 GND Power Supply Ground 802.15) or 625kbps (Turbo mode). It is 6 VCC Power Supply (3.3V) designed for use with the Microchip 7 INT Interrupt Output microcontroller families (PIC18, PIC24, dsPIC33, and PIC32) and the ZigBee , 8 ~RST Hardware Reset MiWi, and MiWi P2P software stacks all 9 WAKE Hardware Wake available for download at the Microchip 10 NC Not Connected website: www.microchip.com/wireless. 11 GND Power Supply Ground 12 VCC Power Supply (3.3V) Interface The primary communications interface with the The SPI interface standard uses four signal PmodRF2 is an SPI bus on J1. The PmodRF2 lines. These are chip select (~CS), serial data is implemented as a slave device in SPI mode in (SDI), serial data out (SDO), and serial clock (0, 0), which requires SCK to idle in a low state (SCK). These signals map to the following and the ~CS pin to be held low during signals on the MRF24J40: ~CS corresponds to communication. An RST pin provides the host the Chip Select signal (~CS), SDI corresponds with an active low, asynchronous hardware to Serial Data Input (SDI), SDO corresponds to reset for the PmodRF2. The PmodRF2 also Serial Data Output (SDO), and SCK provides a configurable polarity interrupt corresponds to the Serial Clock signal (SCK). (default active low) indicator pin (INT), which is asserted by the PmodRF2 when data is available for the host device. The INT line is de-asserted after the INTSTAT register is read. Doc: 502-201 page 1 of 2 Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners. PmodRF2 Reference Manual Power Supply The PmodRF2 is designed to work with Digilent microcontroller boards that have 12- pin header connectors. The PmodRF2 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 to be provided to the Pmod. WARNING: 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 MRF24J40, see the MRF24J40 datasheet at the Microchip web site. www.digilentinc.com page 2 of 2 Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.