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MRF89XAM9A
1.3
Operation
1.3.2
CRYSTAL FREQUENCY
The MRF89XAM9A module is based on the
Microchip’s MRF89XA Ultra Low-Power, Integrated
ISM Band Sub-GHz Transceiver IC. Data
When calculating frequency deviation, bit rate, receiver
bandwidth, and PLL R, P and S values, use crystal
frequency f xtal = 12.8 MHz.
communication and module configuration are
documented in the “ MRF89XA Ultra Low-Power,
1.3.3
CLOCK OUTPUT (CLKOUT)
Integrated ISM Band Sub-GHz Transceiver Data
Sheet ” (DS70622).
This section emphasizes operational settings that are
unique to the MRF89XAM9A module design that must
be followed for proper operation.
1.3.1 RESET
Pin 2 of the module, RESET, allows an external reset of
the MRF89XA IC. RESET is connected to the TEST8
pin of the MRF89XA IC. During normal operations of
the MRF89XAM9A, the RESET pin should be held in a
high impedance state. For more information on
assertion of the RESET pin, refer to “ Section 3.1.2
Manual Reset ” in the “ MRF89XA Data Sheet ”
The CLKOUT pin 19 of the MRF89XA IC is not used on
the module. Ensure that the CLKOUT signal is disabled
to minimize current consumption.
1.3.4 FREQUENCY BAND SELECT
The Frequency Band Select (FBS<1:0>) bits in the
GCONREG<4:3> should be set for target channel
range 902–915 MHz FBS<1:0> = '00' or 915–928 MHz
FBS<1:0> = '01'.
1.3.5 VCO TANK TRIM VALUE
The VCO Trim (VCOT<1:0>) bits in the
GCONREG<2:1> should be set for VCOT<1:0> = '01'
for the inductor values of the module.
(DS70622).
1.3.6
BIT RATE
The maximum bit rate value will be limited to 28 kbps
for OOK modulation due to the crystal frequency of
12.8 MHz.
? 2011 Microchip Technology Inc.
Preliminary
DS75017A-page 7
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