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MRF89XAM8A
2.0 CIRCUIT DESCRIPTION
The MRF89XAM8A module interfaces to Microchip’s
PIC16, PIC18, PIC24, dsPIC33 and PIC32
Figure 2-2 illustrates the MRF89XAM8A schematics.
Table 2-1 details the Bill of Materials (BOM).
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 2-1:
MRF89XAM8A APPLICATION SCHEMATIC
+ 3.3V
C1
Note 1
+ C2
1
GND
U1
MRF89XAMxA-I/RM
GND
12
0.1 μ F
1 0 μ F
2
RESET
GND
11
To Host
Microcontroller
3
4
5
CSCON
IRQ0
SDI
V IN
IRQ1
CSDATA
10
9
8
To Host
Microcontroller
6
SCK
SDO
7
Note:
For battery powered applications, place a 10 μ F capacitor in parallel with the 0.1 μ F bypass
capacitor to provide a low impedance during startup sequences.
? 2010 Microchip Technology Inc.
Preliminary
DS70651A-page 9
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