PCF8537 datasheet(20/82 Pages) NXP

20 / 82 page

PCF8537

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Product data sheet

Rev. 1 — 31 May 2012

20 of 82

NXP Semiconductors

PCF8537

Industrial LCD driver for multiplex rates up to 1:8

8.2.4 Recommended sequences to enter power-down mode

With the following sequences, the PCF8537 can be set to a state of minimum power

consumption, called power-down mode.

Fig 8.

Recommended start-up sequence when using an external supplied VLCD and an

external clock signal

Wait minimum

1 ms

START

Initialize

command

013aaa635

Write RAM

content to be

displayed and

enable the

display

STOP

Apply external

clock signal

to pin CLK;

set OSC bit

logic 1

Power-on

VDD1, VDD2

and VLCD

at the

same time

Initiate an

OTP-refresh

Fig 9.

Recommended power-down sequence for minimum power-down current when

using the internal charge pump and the internal clock signal

Stop genera-

tion of VLCD

by setting bit

CPE logic 0

START

Disable dis-

play by setting

bit E logic 0

Disable tem-

perature mea-

surement by

setting bit

TME logic 0

013aaa636

STOP

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