PCF8537 datasheet(18/82 Pages) NXP

18 / 82 page

PCF8537

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Product data sheet

Rev. 1 — 31 May 2012

18 of 82

NXP Semiconductors

PCF8537

Industrial LCD driver for multiplex rates up to 1:8

The first command sent to the device after the power-on event must be the Initialize

command (see Section 8.1.1).

After POR and before enabling the display, the RAM content should be brought to a

defined status

• by clearing it (setting it all to logic 0) or

• by writing meaningful content (for example, a graphic)

otherwise unwanted display artifacts may appear on the display.

8.2.2 RESET pin function

The RESET pin of the PCF8537 resets all the registers to their default state. The reset

state is given in Table 23. The RAM contents remain unchanged. After the reset signal is

removed, the PCF8537 will behave in the same manner as after POR. See Section 8.2.1

for details.

8.2.3 Recommended start-up sequences

This chapter describes how to proceed with the initialization of the chip in different

application modes.

(1) This time depends on the external capacitor on pin VLCD. For a capacitor of 100 nF a delay of 5 ms

to 15 ms is expected.

Fig 5.

Recommended start-up sequence when using the internal charge pump and the

internal clock signal

Wait minimum

1 ms

START

Power-on

VDD1 and

VDD2 at the

same time

013aaa632

Set VPR

desired VLCD

value

Set

multiplication

factor for

charge pump

and enable it

Wait till

VLCD reaches

programmed

value(1)

Write RAM

content to be

displayed and

enable the

display

STOP

Initiate an

OTP-refresh

Initialize

command

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