Datasheet > BU9797FUV-M

BU9797FUV-M

更新时间： 2023-09-03 20:25:07

品牌	Logo	应用领域
罗姆 - ROHM		驱动控制器微控制器驱动器
页数	文件大小	规格书
28页	867K
描述
BU9797FUV-M是1/4占空比车载用通用LCD驱动器，最多可显示144段LCD。本产品支持高液晶电压驱动及高帧频率驱动，也可驱动高显示精度的VA液晶。内置显示用RAM，可减轻微控制器负荷，还无需外置部件，实现了低功耗。

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BU9797FUV-M 数据手册

Datasheet

BU9797FUV-M

MAX 144 segments (SEG36×COM4)

Functional descriptions

Command /Data transfer method

This device is controlled by 2wire signal (SDA, SCL).

SDA

SCL

START condition

STOP condition

Figure 7. 2 wire Command/Data transfer Format

It has to generate the condition such as START condition and STOP condition in 2wire serial interface transfer method.

Slave address

Display Data

A P

Command

0 1 1 1 1 1 0 M A C

R/W

Command or data judgment bit

START condition

STOP condition

Acknowledge

Figure 8. Interface protcol

Method of how to transfer command and data is shown as follows.

(1) Generate “START condition”.

(2) Issue Slave address.

(3) Transfer command and display data.

Acknowledge (ACK)

Data format is 8bits and return Acknowledge after transfer 8bits data.

When SCL 8th=’L’ after transfer 8bit data (Slave Address, Command, Display Data), output ’L’ and open SDA line.

When SCL 9th=’L’, stop output function.

(As Output format is NMOS-Open-Drain, can’t output ‘H’ level.)

If no need Acknowledge function, please input ‘L’ level from SCL 8th=’L’ to SCL 9th=’L’.

SDA

1-7

SCL

ACK

DATA

SLAVE ADDRESS

ACK

START

STOP

condition

Figure 9. Acknowledge timing

www.rohm.com

TSZ02201-0P4P0D300430-1-2

5.Aug.2014 Rev.002

6/25

TSZ22111･15･001

1...3 4 567 8 9...28

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