RFM31 Datasheet, PDF (130/137 Pages) –

RFM31
VCC
GND
GPIO_0
GPIO_1
GPIO_2
SDO
SDI
SCLK
nSEL
nIRQ
SDN
ANT
NC
S
+1.8 to +3.6 V supply voltage. The recommended VCC supply voltage is +3.3 V.
S
Ground reference.
I/O
General Purpose Digital I/O that may be configured through the registers to perform various
functions including: Microcontroller Clock Output, FIFO status, POR, Wake-Up timer, Low
I/O
Battery Detect, TRSW, AntDiversity control, etc. See the SPI GPIO Configuration Registers,
I/O
Address 0Bh, 0Ch, and 0Dh for more information.
0–VCC V digital output that provides a serial readback function of the internal control
O
registers.
Serial Data input. 0–VCC V digital input. This pin provides the serial data stream for the 4-line
I
serial data bus.
Serial Clock input. 0–VDD V digital input. This pin provides the serial data clock function for
I
the 4-line serial data bus. Data is clocked into the RFM31 on positive edge transitions.
Serial Interface Select input. 0– VCC V digital input. This pin provides the Select/Enable
I
function for the 4-line serial data bus. The signal is also used to signify burst read/write mode.
General Microcontroller Interrupt Status output. When the RFM31 exhibits anyone of the
Interrupt Events the nIRQ pin will be set low=0. Please see the Control Logic registers
O
section for more information on the Interrupt Events. The Microcontroller can then determine
the state of the interrupt by reading a corresponding SPI Interrupt Status Registers, Address
03h and 04h.
I
Shutdown input pin. 0–VCC V digital input. SDN should be = 0 in all modes except Shutdown
mode. When SDN =1 the chip will be completely shutdown and the contents of the registers
will be lost.
I/O
RF signal input.(50 OHM input Impedance)
No Connection
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