MRF89XAM8A Datasheet, PDF (11/34 Pages) Microchip Technology – 868 MHz Ultra-Low Power

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
Figure 2-1.
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.
Figure 2-2 illustrates the MRF89XAM8A schematics.
Table 2-1 details the Bill of Materials (BOM).
FIGURE 2-1:
MRF89XAM8A APPLICATION SCHEMATIC
+ 3.3V
Note 1
U1
MRF89XAMxA-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.
© 2010 Microchip Technology Inc.
Preliminary
DS70651A-page 9