MRF89XAM9A datasheet(3/36 Pages) MICROCHIP

3 / 36 page

 2011-2012 Microchip Technology Inc.

Preliminary

DS75017B-page 3

MRF89XAM9A

1.0

DEVICE OVERVIEW

The MRF89XAM9A is an ultra low-power sub-GHz

surface mount transceiver module with integrated

crystal, internal voltage regulator, matching circuitry

and PCB antenna. The MRF89XAM9A module

operates in the United States/Canada 902–928 MHz

ISM frequency band. The integrated module design

frees the integrator from extensive RF and antenna

design, and regulatory compliance testing, ballowing

quicker time to market.

The MRF89XAM9A module is compatible with

Microchip’s MiWi™ Development Environment software

stacks. The software stacks are available as a free

download, including source code, from the Microchip’s

web site http://www.microchip.com/wireless.

The MRF89XAM9A module has received regulatory

approvals for modular devices in the United States

(FCC) and Canada (IC). Modular device approval

removes the need for expensive RF and antenna

design, and allows the user to place the MRF89XAM9A

module inside a finished product and it does not require

regulatory testing for an intentional radiator (RF

transmitter). To maintain conformance, refer to module

settings in Section 3.1.1, MRF89XAM9A SETTINGS

for the United States and Section 3.2.1, MRF89XAM9A

SETTINGS for Canada.

1.1

Interface description

The simplified block diagram of the MRF89XAM9A

module is shown in Figure 1-1. The module is based on

the Microchip Technology MRF89XA Ultra Low-Power

Sub-GHz Transceiver Integrated Circuit (IC). The

module interfaces to many popular Microchip PIC®

microcontrollers through a 3-wire serial SPI interface,

two chip selects (configuration and data), two interrupts

Interrupt Request 0 (IRQ0) and Interrupt Request 1

(IRQ1), Reset, power and ground as shown in

Figure 1-2. Table 1-1 provides the pin descriptions.

Data communication and module configuration are

documented in the “MRF89XA Ultra Low-Power,

Integrated Sub-GHz Transceiver

” (DS70622) Data

Sheet. For more information on specific serial interface

protocol and general register definitions, refer to the

“MRF89XA Data Sheet” and see Section 1.3,

Operation for specific register settings unique to the

MRF89XAM9A

module

operation

maintain

regulatory compliance.

FIGURE 1-1:

MRF89XAM9A BLOCK DIAGRAM

MRF89XA

Control

Interface

Power

Management

Baseband

MRF89XAM9A Module

SPI

Digital I/O

IRQ0

Power

12.8 MHz Crystal

Matching

Circuitry

and

SAW Filter

PCB

Antenna

Loop

Filter

VCO

Tank

IRQ1

CSDATA

CSCON

RESET

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