Microchip Technology AC164138-1 Data Sheet
© 2010 Microchip Technology Inc.
Preliminary
DS70651A-page 9
MRF89XAM8A
2.0
CIRCUIT DESCRIPTION
The MRF89XAM8A module interfaces to Microchip’s
PIC16, PIC18, PIC24, dsPIC33 and PIC32
microcontrollers with a minimum of external
components through digital only connections. An
example application schematic is illustrated in
PIC16, PIC18, PIC24, dsPIC33 and PIC32
microcontrollers with a minimum of external
components through digital only connections. An
example application schematic is illustrated in
.
2.1
Module Schematic
The MRF89XAM8A module is based on the Microchip
Technology 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 brought to the module pins.
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.
Technology 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 brought to the module pins.
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.
details the Bill of Materials (BOM).
FIGURE 2-1:
MRF89XAM8A APPLICATION SCHEMATIC
Note 1
+ C2
1 0 μF
C1
0.1 μF
To Host
Microcontroller
To Host
Microcontroller
U1
MRF89XAMxA-I/RM
+ 3.3V
GND
RESET
CSCON
IRQ0
SDI
SCK
GND
GND
V
IN
IRQ1
CSDATA
SDO
1
2
3
4
5
6
12
11
10
9
8
7
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.
capacitor to provide a low impedance during startup sequences.