SCA100T 查看數據表（PDF） - Murata Manufacturing

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SCA100T

THE SCA100T DUAL AXIS INCLINOMETER SERIES

Murata Manufacturing 

SCA100T Series

 each bit is sampled on the rising edge of SCK (MOSI line)

 after the device is selected with the falling edge of CSB, an 8-bit command is received. The

command defines the operations to be performed

 the rising edge of CSB ends all data transfer and resets internal counter and command register

 if an invalid command is received, no data is shifted into the chip and the MISO remains in

high impedance state until the falling edge of CSB. This reinitializes the serial communication.

 data transfer to MOSI continues immediately after receiving the command in all cases where

data is to be written to SCA100T’s internal registers

 data transfer out from MISO starts with the falling edge of SCK immediately after the last bit of

the SPI command is sampled in on the rising edge of SCK

 maximum SPI clock frequency is 500kHz

 maximum data transfer speed for RDAX or RDAY is 5300 samples per sec for one channel at

500kHz clock

 maximum data transfer speed for RDAX and RDAY is 4150 samples per sec for two channel at

500kHz clock

SPI command can be either an individual command or a combination of command and data. In the

case of combined command and data, the input data follows uninterruptedly the SPI command and

the output data is shifted out parallel with the input data.

The SPI interface uses an 8-bit instruction (or command) register. The list of commands is given in

Table below.

Command

name

MEAS

RWTR

STX

STY

RDAX

RDAY

Command

format

00000000

00001000

00001110

00001111

00010000

00010001

Description:

Measure mode (normal operation mode after power on)

Read temperature data register

Activate Self test for X-channel

Activate Self test for Y-channel

Read X-channel acceleration

Read Y-channel acceleration

Measure mode (MEAS) is standard operation mode after power-up. During normal operation, the

MEAS command is the exit command from Self test.

Read temperature data register (RWTR) reads temperature data register during normal

operation without affecting the operation. The temperature data register is updated every 150 µs.

The load operation is disabled whenever the CSB signal is low, hence CSB must stay high at least

150 µs prior to the RWTR command in order to guarantee correct data. The data transfer is

presented in Figure 10 below. The data is transferred MSB first. In normal operation, it does not

matter what data is written into temperature data register during the RWTR command and hence

writing all zeros is recommended.

Figure 10. Command and 8 bit temperature data transmission over the SPI

Murata Electronics Oy

www.muratamems.fi

Subject to changes

Doc. nr. 8261800

11/17

Rev.B2

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