MRF89XAM8A datasheet(11/34 Pages) MICROCHIP

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Preliminary

DS70651A-page 9

MRF89XAM8A

2.0

CIRCUIT DESCRIPTION

The MRF89XAM8A module interfaces to Microchip’s

PIC16,

PIC18,

PIC24,

dsPIC33

and

PIC32

microcontrollers

with

minimum

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

Note 1

+ C2

1 0 μF

0.1 μF

To Host

Microcontroller

To Host

Microcontroller

MRF89XAMxA-I/RM

+ 3.3V

GND

RESET

CSCON

IRQ0

SDI

SCK

GND

VIN

IRQ1

CSDATA

SDO

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.

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