MRF89XAM9A_12 Datasheet, PDF (3/36 Pages) Microchip Technology – 915 MHz Ultra Low-Power Sub-GHz Transceiver Module

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 to maintain
regulatory compliance.
FIGURE 1-1:
MRF89XAM9A BLOCK DIAGRAM
PCB
Antenna
MRF89XAM9A Module
MRF89XA
Matching
Circuitry
and
SAW Filter
Control
Interface
RF
Baseband
Power
Management
CSCON
CSDATA
SPI Digital I/O
IRQ0
IRQ1
RESET
Power
VCO
Tank
Loop
Filter
12.8 MHz Crystal
 2011-2012 Microchip Technology Inc.
Preliminary
DS75017B-page 3