868.35 MHz

Transceiver Module

RF Monolithics, Inc.

Phone: (972) 233-2903

Fax: (972) 387-8148

E-mail: info@rfm.com

Page 6 of 8

RFM Europe

Phone: 44 1963 251383

Fax: 44 1963 251510

http://www.rfm.com

©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.

DR8001-071107

Power-up Mode Select (J2)

J2 is used to select the operating mode of the TR8001 device only at power-up. The state of J2 when VCC is applied will determine whether

the board operates in 2G mode or 3G mode. Pin 2 (center pin) of J2 is connected to Pin 19 (CFG) of the TR8001 device and is grounded

for 2G mode and functions as the chip select line for the serial interface in 3G mode. Installing the jumper will either connect the CFG pin

of the TR8001 to GND or directly to the processor for control in 3G mode. See the table below for power-up jumper settings.

After power-up if 3G mode is selected, pin 15 (3G Sel) must be pulled ‘High’ to initiate the processor to operate in 3G mode. Failure to pull

pin 15 ‘High’ after power-up will cause the processor to remain inactive.

J4

Programming Header (J4)

The programming header allows for custom firmware development for the Silicon Labs C8051F330 if desired. Contact RFM

for more information about custom firmware development.

Setting

Power-up Mode

Pin 19

J2(1-2)

2G

Connected to GND

J2(2-3)

3G

Connected to Processor