MRF89XAM9A
915 MHz Ultra Low-Power Sub-GHz Transceiver Module
Features
• Module designed from the MRF89XA Integrated
Ultra Low-Power, Sub-GHz Transceiver IC
• Supports MiWi™ Development Environment
Proprietary Wireless Networking Protocols
• 4-Wire Serial Peripheral Interface (SPI) with
Interrupts
• Small Size: 0.7" x 1.1" (17.8 mm x 27.9 mm),
Surface Mountable – pin compatible with
MRF89XAM8A
• Integrated Crystal, Internal Voltage Regulator,
Matching Circuitry and Printed Circuit Board
(PCB) Antenna
• Easy Integration into Final Product – Minimize
Product Development, Quicker Time to Market
• Compatible with Microchip’s Microcontroller
Families (PIC16, PIC18, PIC24, dsPIC33 and
PIC32)
• Modular Device Approval for United States (FCC),
Canada (IC) and Radio Regulation Certified for
Australia/New Zealand (C-TICK)
RF/Analog Features
• ISM Band 902–928 MHz Operation
• Modulation: FSK and OOK
• Data Rate:
- FSK: 200 kbps
- OOK: 28 kbps
• Reception sensitivity
- FSK: -105 dBm (typical) at 25 kbps
- OOK: -111 dBm (typical) at 2 kbps
• +10 dBm Typical Output Power with 21 dB Tx
Power Control Range
Media Access Controller (MAC)/
Baseband Features
• Packet handling feature with data whitening and
automatic CRC generation
• Incoming sync word (pattern) recognition
• Built-in bit synchronizer for incoming data, and clock
synchronization and recovery
• 64-byte transmit/receive FIFO with preload in Stand-by
mode
• Supports Manchester encoding/decoding
techniques
Operational
• Operating Voltage: 2.1–3.6V (3.3V typical)
• Temperature Range: -40°C to +85°C Industrial
• Low-Current Consumption:
- Rx mode: 3 mA (typical)
- Tx mode: 25 mA at +10 dBm (typical)
- Sleep: 0.1 µA (typical)
Pin diagram
GND
RESET
CSCON
IRQ0
SDI
SCK
1
2
3
4
5
6
12
11
10
9
8
7
GND
GND
V
IN
IRQ1
CSDATA
SDO
2011-2012 Microchip Technology Inc.
Preliminary
DS75017B-page 1
MRF89XAM9A
Table of Contents
1.0 Device Overview .......................................................................................................................................................................... 3
2.0 Circuit Description ........................................................................................................................................................................ 9
3.0 Regulatory Approval ................................................................................................................................................................... 17
4.0 Electrical Characteristics ............................................................................................................................................................ 23
Appendix A: Revision History............................................................................................................................................................... 29
The Microchip Web Site ....................................................................................................................................................................... 31
Customer Change Notification Service ................................................................................................................................................ 31
Customer Support ................................................................................................................................................................................ 31
Reader Response ................................................................................................................................................................................ 32
Product Identification System............................................................................................................................................................... 33
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DS75017B-page 2
Preliminary
2011-2012 Microchip Technology Inc.
MRF89XAM9A
1.0
DEVICE OVERVIEW
1.1
Interface description
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.
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
MRF89XAM9A Module
MRF89XA
CSCON
CSDATA
SPI
PCB
Antenna
Matching
Circuitry
and
SAW Filter
Control
Interface
RF
Baseband
Power
Management
Digital I/O
IRQ0
IRQ1
RESET
Power
VCO
Tank
Loop
Filter
12.8 MHz Crystal
2011-2012 Microchip Technology Inc.
Preliminary
DS75017B-page 3
MRF89XAM9A
TABLE 1-1:
Pin
1
2
3
4
5
6
7
8
9
10
11
12
PIN DESCRIPTION
Symbol
GND
RESET
CSCON
IRQ0
SDI
SCK
SDO
CSDATA
IRQ1
Vin
GND
GND
Type
Power
DI
DI
DO
DI
DI
DO
DI
DO
Power
Power
Power
Ground
Reset Pin. For more information, refer to
Section 1.3.1, Reset
Serial Interface Configure Chip Select
Interrupt Request Output
Serial Interface Data Input
Serial Interface Clock
Serial Interface Data Output
Serial Interface Data Chip Select
Interrupt Request Output
Power Supply
Ground
Ground
Description
FIGURE 1-2:
MICROCONTROLLER TO MRF89XAM9A INTERFACE
MRF89XAM9A
CSCON
CSDATA
SDI
V
IN
GND
SDO
SCK
IRQ0
IRQ1
RESET
PIC
®
Microcontroller
I/O
I/O
SDO
SDI
SCK
INTx
INTx
I/O
DS75017B-page 4
Preliminary
2011-2012 Microchip Technology Inc.
MRF89XAM9A
1.2
Mounting Details
The MRF89XAM9A is a surface mountable module.
The dimensions of the module are shown in
Figure 1-
3.
The module PCB is 0.032" thick with castellated
mounting holes on the edge.
Figure 1-4
is the
recommended
host PCB
footprint for
the
MRF89XAM9A.
The MRF89XAM9A has an integrated PCB antenna.
For the best performance, follow the mounting details
shown in
Figure 1-5.
It is recommended that the
module be mounted on the edge of the host PCB and
an area around the antenna, approximately 3.4"
(8.6 cm), be kept clear of metal objects for best
performance. A host PCB ground plane around the
MRF89XAM9A acts as a counterpoise to the PCB
antenna. It is recommended to extend the ground plane
at least 0.4" (1 cm) around the module.
FIGURE 1-3:
MODULE DETAILS
FIGURE 1-4:
RECOMMENDED PCB FOOTPRINT
2011-2012 Microchip Technology Inc.
Preliminary
DS75017B-page 5
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