Owner's manual

RFM12B
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Typical Application：
• Remote control
• Remote sensor
• Wireless data collection
• Home security system
• Toys
• Tire pressure monitoring system
Pin Definition：
SMD DIP
definition Type Function
nINT/VDI DI/ DO Interrupt input (active low)/Valid data indicator
VDD S Positive power supply
SDI DI SPI data input
SCK DI SPI clock input
nSEL DI Chip select (active low)
SDO DO Serial data output with bus hold
nIRQ DO
Interrupts request output（active low）
FSK/DATA/nFFS DI/DO/DI Transmit FSK data input/ Received data output (FIFO not used)/ FIFO
select
DCLK/CFIL/FFIT DO/AIO/DO Clock output (no FIFO )/ external filter capacitor(analog mode)/ FIFO
interrupts(active high)when FIFO level set to 1, FIFO empty
interruption can be achieved
CLK DO Clock output for external microcontroller
nRES DIO
Reset output（active low）
GND S Power ground
Electrical Parameter：
Maximum（not at working mode）
symbol parameter minimum maximum Unit
V
dd
Positive power supply -0.5 6.0 V
V
in
All pin input level -0.5 Vdd+0.5 V