5/30

BU91501KV-M

Datasheet

TSZ02201-0P4P0D301120-1-2

8.July.2015 Rev.001

www.rohm.com

© 2015 ROHM Co., Ltd. All rights reserved.

TSZ22111･15･001

I/O equivalent circuit

Figure 6. I/O equivalent circuit

Function descriptions

Command and Data Transfer Method

3-SPI (3-wire Serial Interface)

This device is controlled by a 3-wire signal (CSB, SCL, and SD).

First, Interface counter is initialized with CSB=“H"

Setting CSB=”L” enables SD and SCL inputs.

First, Interface counter is initialized with CSB=“H", and then CSB=”L” makes SD and SCL input enable.

The protocol of 3-SPI transfer is shown as follows.

Each command starts with D7 bit as MSB data, followed by D6 to D0 (this is while CSB =”L”).

(Internal data is latched at the rising edge of SCL, then the data is converted to an 8-bit parallel data at the falling edge of

the 8th CLK.)

When you rise CSB = “H”, in case command less than 8bit, command and data are canceled.

(1) Write Mode

Figure 7. 3-SPI Data Transfer Format

３