MRF89XAM9A_12 Datasheet, PDF (9/36 Pages) Microchip Technology – 915 MHz Ultra Low-Power Sub-GHz Transceiver Module

MRF89XAM9A
2.0 CIRCUIT DESCRIPTION
The MRF89XAM9A module interfaces to Microchip’s
PIC16, PIC18, PIC24, PIC32 and dsPIC33
microcontrollers with a minimum of external
components through digital only connections. An
example application schematic is shown in Figure 2-1.
2.1 Module Schematic
The MRF89XAM9A module is based on the
Microchip’s MRF89XA Ultra Low-Power, Integrated
ISM Band Sub-GHz Transceiver IC. The serial I/O
(CSCON, CSDATA, SCK, SDO and SDI), Reset, IRQ0
and IRQ1 pins are routed out and available on the
module pins as shown in Figure 2-2. Crystal X1 is a
12.8 MHz crystal with a frequency tolerance of
±10 ppm at 25°C. The RFIO output is matched to the
SAW filter FL1 and further matched to the PCB trace
antenna.
Figure 2-2 illustrates the MRF89XAM9A schematics.
Table 2-1 details the Bill of Materials (BOM).
FIGURE 2-1:
MRF89XAM9A APPLICATION SCHEMATIC
+ 3.3V
Note 1
U1
MRF89XAM9A-I/RM
C1
0.1 μF
+ _C2
1 0 μF
To Host
Microcontroller
1
GND
2 _RESET
3
CSCON
4
IRQ0
5
SDI
6
SCK
12
GND
11
GND
10
VIN
9
IRQ1
8
CSDATA
7
SDO
To Host
Microcontroller
Note: For battery powered applications, place a 10 μF capacitor in parallel with the 0.1 μF bypass
capacitor to provide a low impedance during startup sequences.
 2011-2012 Microchip Technology Inc.
Preliminary
DS75017B-page 9