User's Manual

DR2.4：
The DR2.4 module is designed for 2.4GHz ISM band with 10dBm output power wireless
applications using AMICCOM A7125 FSK transceiver and Transistor BFG425 PHILIPS.
This
module features a fully programmable frequency synthesizer by SPI. The data rate is
2Mbps.
External PA Control
To gain the most available hopping channels under FCC / ETSI regulations, user has to
switch
off Ext-PA before A7125’s PA (Em-PA) to minimize spurious emission. In the other
words,
band edge becomes critical so that A7125 supports two methods (EOPD and PASW) to let
user
switch Ext-PA easily.
(1) EOPD (End Of Packet Delay)
Set GIO2S = [1100] and EOPDS=1, then EOPD outputs 20 us pulse to GIO2 pin
(2) PASW (Ext-PA Switch)
Set GIO2S = [0001] and EOPDS=1, then PASW outputs to GIO2 pin. However, GIO2 Pin
Register shall set different in TX mode (0x07) and RX mode (0x13) to avoid FSYNC
triggering in
RX mode. Therefore, before issue TX Strobe command, write 0x07 to GIO2 Pin Register.
Before
issue RX Strobe command, write 0x13 to GIO2 Pin Register. Then, PASW is only active
in TX
mode. In such case, user just needs to connect GIO2 pin to external SWITCH (Ext-SW) of
Ext-PA
as show below. Be notice, PASW is also able to output to GIO1 pin. In addition, user can
configure
PASW to be active high or active low (by GIO2I) based on the polarity of Ext-SW.