RFM75 RS232
DESCRIPTION:
RFM75 is a GFSK transceiver operating in the world wide ISM frequency band at 2400-2483.5 MHz. Burst mode transmission and up to 2Mbps air data rate makes them suitable for applications requiring ultra low power consumption.
The RF channel frequency determines the centred of the channel used by RFM75. The RFM75RS232 is configured and operated through a Serial Peripheral Interface (SPI).The frequency is set by the RF_CH register in register bank 0 according to the following formula: F0= 2400 RF_CH (MHz). The resolution of the RF channel frequency is 1MHz.
A transmitter and a receiver must be programmed with the same RF channel frequency to be able to communicate with each other. The output power of RFM75 is set by the RF_PWR bits in the RF_SETUP register.
FEATURES:
-2400-2483.5 MHz ISM band operation
-Support 250Kbps, 1Mbps and 2 Mbps air data rate
-Programmable output power
-Tolerate /- 60ppm 16 MHz crystal
-Variable payload length from 1 to 32bytes
-Automatic packet processing
-6 data pipes for 1:6 star networks
-1.9V to 3.6V power supply
-4-pin SPI interface with maximum 8 MHz clock rate
-20-pin 4x4mm QFN package
CONNECTION DIAGRAM FOR RFM75 RS232:
-5v-Power supply
-GND-GROUND PIN
-TX-CONNECT TO RX OF MICROCONTROLLER
-RX-CONNECT TO TX OF MICROCONTROLLER
-SET ADDRESS BIT HERE (BOTH TX, RX MUST IN SAME ADDRESS BIT)
CONNECTION STEPS:
-Connect 5v power supply to RFM75RS232
-When connect the power supply “LED will blinkâ€
-Connect Tx pin of RFM75RS232 to microcontroller Rx pin
-Connect Rx pin of RFM 75RS232 to microcontroller Tx pin
-When data passing through Microcontroller then Rx LED of RFM75RS232 will blink
-Both transmitter and receiver address bit should be in even.
NOTE:
If address bit switches are changed then need to press reset.
APPLICATIONS:
-Wireless PC peripherals
-Wireless gamepads
-Wireless audio
-Remote controls
-Home automation
-Toys
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