User's Manual

User Manual
SM3000 OEM module
6.2.3 SPI interface
Physical connections
The following pictures show the physical connections needed to enable SM3000 SPI communication. The
arrow indicates the direction of information flow. For example the DR pin is an output of the module and an
input for the Host. The CS can be used by the Host to enable its SPI hardware module. CS is active lo.
Assumed is that module and Host are powered by the same power supply using the same voltage to drive
the pins.
Pin mapping for SM3000
Pin Description Voltage levels
VDD SM3000 supply voltage VDD
GND Supply ground GND
CS Slave chip select VDD
DR Data communication start signal line (Data ready) VDD
RTS Host Request To Send signal line VDD
SCLK SPI clock VDD
MOSI SPI master out slave in VDD
MISO SPI master in slave out VDD
RESET SM3000 device reset line -
9/27 Ambient Systems B.V.