MRF89XAM9A-I/RM【PDF 11/34 页】IC TXRX MOD 915MHZ ULP SUB-GHZ

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MRF89XAM9A

2.0

CIRCUIT DESCRIPTION

2.1

Module Schematic

The MRF89XAM9A 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 shown in Figure 2-2 .

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

C1

Note 1

+ C2

1

GND

U1

MRF89XAM9A-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.

? 2011 Microchip Technology Inc.

Preliminary

DS75017A-page 9

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