BU9728 Ver la hoja de datos (PDF) - ROHM Semiconductor

Número de pieza

componentes Descripción

Fabricante

BU9728

For 128～ 140 Segment type LCD, LCD Segment Driver

ROHM Semiconductor 

● Cautions of Power-On condition (BU9795AKV /AFV /AGUW)

This LSI has “P.O.R” (Power-On Reset) circuit and Software Reset function.

Please keep the following recommended Power-On conditions in order to power up

properly.

1. Please set power up conditions to meet the recommended tR, tF, tOFF, and Vbot spec below

in order to ensure P.O.R operation.

VDD

tF

tOFF

tR

Vbot

Recommendation condition of tR,tF,tOFF,Vbot

tR

tF

tOFF

Vbot

Less than 1ms Less than 1ms More than Less than 0.1V

150ms

Power

ON/OFF

Fig. BU9795AKV /AFV /AGUW-18 Power on-off waveform

2. If it is difficult to meet above conditions, execute the following sequence after Power-On.

Because it doesn’t accept the command in power off, it is necessary to care that correspondence

by software reset doesn’t become alternative to POR function completely.

(1) CSB=”L”→”H” condition

VDD

CSB

Fig. BU9795AKV-19 CSB Timing

(2) After CSB”H”→“L”, execute Software Reset (ICSET command).

● IO Circuit (BU9795AKV /AFV /AGUW)

VDD

VLCD

VDD

TEST

VSS

VSS

VDD

CSB, SD, SCL

VSS

VDD

OSCIN

VSS

VDD

INHb

VSS

VDD

VSS

Fig. BU9795AKV /AFV /AGUW-20 IO circuit

20/23

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