[2SMPB-02E] Datasheet Rev.05(Jun.,2017)

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4.6 SPI Protocol

(1)

SPI write

“SPI Write” needs to transmit the one set data of Register Address(Ctl.=”0”+Address) and a writing data in the

situation where CSB is "L". Two or more writing can be possible during CSB is

“L”. If CSB becomes "H", SPI

communication will finish. (as well as I²C write)

(2)

SPI read

First,

“SPI read” needs to transmit Register Address(Ctl.=”1”+Address) in a situation where CSB is "L".

Next, the data of the requested register address will be output from SDO. (in case of 3-wire mode, the data will

be output from SDI). After that, the register address is automatically incremented by one until CSB becomes

“H”, the device will output the data repeatedly. (as well as I²C read)

Below shows an example of the 2 bytes reading from "0xFA" register.

CSB

SCK

・・・

・・・

・・・

・・・

　・・・

SDI/O

Start

0

Address(7bit)

Write Data(8bit)

0

Address(7bit)

Write Data(8bit)

・・・

Stop

CSB

SCK

・・・

・・・

・・・

SDI/O

Start

1

Address"0x7A"(7bit)

Read Data of "0x7A"

Read Data of "0x7B"

Stop