SCA3000-D01 datasheet(24/43 Pages) VTI

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SCA3000 Series

VTI Technologies Oy

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www.vti.fi

Doc.Nr. 8257300A.07

Rev.A.07

Serial Interfaces

Communication between the SCA3000 sensor and master controller is based on serial data

transfer and a dedicated interrupt line (INT-pin). Two different serial interfaces are available for the

SCA3000 sensor: SPI and I

2C (Phillips specification V2.1). However, only one per product is

enabled by pre-programming in the factory. The SCA3000 acts as a slave on both the SPI and I

bus.

4.1

SPI Interface

SPI bus is a full duplex synchronous 4-wire serial interface. It consists of one master device and

one or more slave devices. The master is defined as a micro controller providing the SPI clock, and

the slave as any integrated circuit receiving the SPI clock from the master. The SCA3000 sensor

always operates as a slave device in master-slave operation mode. A typical SPI connection is

presented in Figure 5.

DATA OUT (MOSI)

DATA IN (MISO)

SERIAL CLOCK (SCK)

SS0

SS1

SS2

SS3

MASTER

MICROCONTROLLER

SCK

SLAVE

SCK

Figure 5. Typical SPI connection.

The data transfer uses the following 4-wire interface:

MOSI

master out slave in

µC → SCA3000

MISO

master in slave out

SCA3000

→ µC

SCK

serial clock

µC → SCA3000

CSB

chip select (low active)

µC → SCA3000

4.1.1

SPI frame format

SCA3000 SPI frame format and transfer protocol is presented in Figure 6.

Figure 6. SPI frame format.

Each communication frame contains 16 bits. The first 8 bits in MOSI line contains info about the

operation (read/write) and the register address being accessed. The first 6 bits define the 6 bit

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