参数资料
型号: BU97930MUV-E2
厂商: Rohm Semiconductor
文件页数: 24/31页
文件大小: 0K
描述: IC LCD DVR MULTI 27X4COM 40-VQFN
标准包装: 1
显示器类型: LCD
配置: 点阵
接口: 3 线 SPI 串行
电流 - 电源: 30µA
电源电压: 1.8 V ~ 3.6 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 40-VFQFN,40-VFQFPN
供应商设备封装: 40-VQFN
包装: 标准包装
其它名称: BU97930MUV-E2DKR
BU97930MUV
MAX 108 segments (SEG27×COM4)
Datasheet
● Power ON / OFF sequence
Display ON/OFF control by INHb terminal is not asynchronous with frame cycle.
In order to prevent display flickering under the power on/off sequence, please send MODESET command (Display off) and
set INHb terminal ="L"
VLCD
VDD
INHb
±0ns No Limit
±0ns No Limit
Command
SWRST
MODE SET
Display off
Various setup
REGSET
RAM WRITE
Blink RAM
WRITE
MODE SET
Display on
MODE SET
Display off
Figure 19. Power On/Off Sequence
● Notes on pull down resistor usage
Satisfy the following sequence if input terminals are pulled down by external resistors (In case MPU output Hi-Z).
Date transaction period with MPU
Input "L"
period
Input"Hi-Z"
period
CSB
SD
SCL
Figure 20. Recommended sequence when input ports are pulled down
BU97930MUV adopts a 5V tolerant I/O for the digital input. This circuit includes a bus-hold function to keep
HIGH level. A pull down resistor of below 10K Ω shall be connected to the input terminals for transitions
from HIGH to LOW because the bus-hold transistor turns on during the input’s HIGH level. (Refer to the
Figure 5; I/O Equivalent Circuit)
A higher resistor than 10K Ω (approximate) causes input terminals being steady by intermediate potential between HIGH
and LOW level so unexpected current is consumed by the system.
The potential depends on the pull down resistance and bus-hold transistor ’s resistance.
As the bus-hold transistor turns off upon the input level is cleared to LOW, a higher resistor can be used as a pull down
resistor if MPU sets SD and SCL lines to LOW before it releases the lines.
The LOW period preceding MPU’s bus release shall be at least 50ns as same as a minimum CLK width ( tSLW ).
www.rohm.com
? 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
24/28
TSZ02201-0A0A2D300060-1-2
8.Jan.2013 Rev.002
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