PCA9620 datasheet(18/71 Pages) NXP

18 / 71 page

PCA9620

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Product data sheet

Rev. 1 — 9 December 2010

18 of 71

NXP Semiconductors

PCA9620

Universal LCD driver for low multiplex rates

7.3.3 Recommended power-down sequences

With the following sequences the PCA9620 can be set to a state of minimum power

consumption, called power-down mode.

Fig 9.

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

external clock signal

Wait 1 ms

START

Initialize

command

013aaa252

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 10. 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

013aaa253

STOP

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