PCF8537 datasheet(22/82 Pages) NXP

22 / 82 page

PCF8537

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Product data sheet

Rev. 1 — 31 May 2012

22 of 82

NXP Semiconductors

PCF8537

Industrial LCD driver for multiplex rates up to 1:8

Remark: 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 this

may cause unwanted display artifacts. In the case of uncontrolled removal of supply

voltages the PCF8537 will not be damaged.

Remark: Static voltages across the liquid crystal display can build up when the external

LCD supply voltage (VLCD) is on while the IC supply voltage (VDD1 or VDD2) is off, or the

other way around. This may cause unwanted display artifacts. To avoid such artifacts,

VLCD, VDD1, and VDD2 must be applied or removed together.

Remark: A clock signal must always be supplied to the device when the display is active.

Removing the clock may freeze the LCD in a DC state, which is not suitable for the liquid

crystal. It is recommended to first disable the display and afterwards to remove the clock

signal.

Fig 12. Recommended power-down sequence for minimum power-down current when

using an external supplied VLCD and an external clock signal

START

Disable dis-

play by setting

bit E logic 0

Disable tem-

perature mea-

surement by

setting bit

TME logic 0

013aaa639

STOP

Bring pin CLK

to 3-state by

setting bit

OSC and bit

COE logic 0

External

clock may

be switched

off

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