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PDF MRF89XAM8A Data sheet ( Hoja de datos )
| Número de pieza | MRF89XAM8A | |
| Descripción | 868 MHz Ultra-Low Power Sub-GHz Transceiver Module | |
| Fabricantes | Microchip | |
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MRF89XAM8A
Data Sheet
868 MHz Ultra-Low Power
Sub-GHz Transceiver Module
© 2010 Microchip Technology Inc.
Preliminary
DS70651A
1 page  
MRF89XAM8A
1.0 DEVICE OVERVIEW
The MRF89XAM8A is an ultra-low power sub-GHz
surface mount transceiver module with integrated
crystal, internal voltage regulator, matching circuitry
and PCB antenna. The MRF89XAM8A module
operates in the European 863–870 MHz frequency
band and is ETSI compliant. The integrated module
design frees the integrator from the extensive RF and
antenna design, and regulatory compliance testing,
allowing quicker time to market.
The MRF89XAM8A 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 MRF89XAM8A module has been tested and
conforms to EN 300 220-2 V2.3.1 (2001–02) and EN
301 489-3 V1.4.1 (2002–08) European Standards. The
module tests can be applied toward final product
certification and Declaration of Conformity (DoC). To
maintain conformance, refer to module settings in
Section 1.3, Operation. Additional testing may be
required depending on the end application.
1.1 Interface description
The simplified block diagram of the MRF89XAM8A
module is illustrated 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 illustrated in
Figure 1-2. Table 1-1 provides the related pin
descriptions.
Serial communication and module configuration are
documented in the “MRF89XA Ultra-Low Power,
Integrated Sub-GHz Transceiver” (DS70622) Data
Sheet. Refer to the “MRF89XA Data Sheet” for specific
serial interface protocol and general register
definitions. Also, see Section 1.3, Operation for
specific register settings that are unique to the
MRF89XAM8A module operation to maintain
regulatory compliance.
FIGURE 1-1:
MRF89XAM8A BLOCK DIAGRAM
PCB
Antenna
MRF89XAM8A 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
© 2010 Microchip Technology Inc.
Preliminary
DS70651A-page 3
5 Page 
MRF89XAM8A
2.0 CIRCUIT DESCRIPTION
The MRF89XAM8A 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 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
+ 3.3V
Note 1
U1
MRF89XAMxA-I/RM
C1
0.1 μF
+ C2
1 0 μF
To Host
Microcontroller
1
GND
2 RESET
3
CSCON
4
IRQ0
5
SDI
6
SCK
GND
GND
VIN
IRQ1
CSDATA
SDO
12
11
10
9
8
7
To Host
Microcontroller
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.
© 2010 Microchip Technology Inc.
Preliminary
DS70651A-page 9
11 Page | ||
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| PDF Descargar | [ Datasheet MRF89XAM8A.PDF ] | |
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