Siemens 1218RF, User Manual, Page: 8 / 9

1218RF USER'S MANUAL PAGE 8 OF 9
10 Module types
Two 1218RF modules are available: One that acts a master and one that acts as a slave. The slave module supports
antenna diversity.
10.1 Master module
The master module dictates the sample rate and decides which RF channels are used. The following connections are
required on the master:
Pin Signal Direction Function
P3V3 P3V3 Input 3.3V power supply
RSTN RSTN Input Module reset
AD1 AD1 Output I2S data
BCLK BCLK Output I2S data clock
WCLK WCLK Output I2S word clock
MCLK MCLK Output I2S Master clock
GIO2 GIO2 Output Audio device reset
SCK SCK Input SPI clock
GIO1 GIO1 Input SPI select
MISO MISO Output SPI data (slave out)
MOSI MOSI Input SPI data (slave in)
CSN CSN Input Network pairing start
10.2 Slave module
The slave module derives its sample rate from the wireless interface. The following connections are required on the
slave:
Pin Signal Direction Function
P3V3 Input 3.3V power supply
RSTN Input Module reset
AD1 Output I2S data
BCLK Output I2S data clock
WCLK Output I2S word clock
MCLK Output I2S Master clock
GIO2 Output Audio device reset
SCK Input SPI clock
GIO1 Input SPI select
MISO Output SPI data (slave out)
MOSI Input SPI data (slave in)
CSN Input Network pairing start