sca3060 VTI Hamlin, sca3060 Datasheet - Page 19

• Manufacturer Part Number: sca3060
• Description: 3-axis Accelerometer
• Manufacturer: VTI Hamlin

4
4.1 SPI Interface
4.1.1
VTI Technologies Oy
www.vti.fi
Serial Interfaces
SPI frame format
Communication between the SCA3060 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
SCA3060 sensor: SPI and I
enabled by pre-programming at the factory. The SCA3060 acts as a slave on both the SPI and I
bus.
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 SCA3060 sensor
always operates as a slave device in master-slave operation mode. A typical SPI connection is
presented in Figure 4.
Figure 4. Typical SPI connection.
The data transfer uses the following 4-wire interface:
SCA3060 SPI frame format and transfer protocol is presented in Figure 5.
Figure 5. 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
MICROCONTROLLER
SERIAL CLOCK (SCK)
MOSI
MISO
SCK
CSB
DATA OUT (MOSI)
DATA IN (MISO)
MASTER
Doc.Nr. 82 1150 00
SS0
SS1
SS2
SS3
master out slave in
master in slave out
serial clock
chip select (low active)
2
C (Phillips specification V2.1). However, only one per product is
SI
SO
SCK
CS
SI
SO
SCK
CS
SI
SO
SCK
CS
SI
SO
SCK
CS
SLAVE
SCA3060 → µC
µC → SCA3060
µC → SCA3060
µC → SCA3060
SCA3060 Series
19/ 31
Rev B
2
C