PCF8545ATTSLASHA datasheet(10/72 Pages) NXP

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PCF8545

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Product data sheet

Rev. 1 — 13 November 2013

10 of 72

NXP Semiconductors

PCF8545

Universal LCD driver for multiplex rates up to 1:8

With the following sequence, the PCF8545 can be set to a state of minimum power

consumption, called power-down mode.

Remarks:

• It is necessary to run the power-down sequence before removing the supplies.

Depending on the application, care must be taken that no other signals are present at

the chip input or output pins when removing the supplies (see Section 10). Otherwise

it may cause unwanted display artifacts. If an uncontrolled removal of the supply

happens, the PCF8545 does not get damaged.

• Static voltages across the liquid crystal display can build up when the external LCD

supply voltage (VLCD) is on while the IC supply voltage is off, or the other way around.

This may cause unwanted display artifacts. To avoid such artifacts, VLCD and VDD

must be applied or removed together.

Table 9.

Effect of the power-down bit (PD)

Effect on function

Mode settings

Effect of setting PD

backplane output

E = 1

normal function

VSS

segment output

E = 1

normal function

VSS

internal oscillator

OSC = 0, COE = 1

off

OSCCLK pin

OSC = 0, COE = 1

output of internal

oscillator frequency

VDD

OSCCLK pin

OSC = 1

input clock

clock input, can be

logic 0, logic 1, or left

floating

Fig 6.

Recommended power-down sequence

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