PCF8537 datasheet(6/82 Pages) NXP

6 / 82 page

PCF8537

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Product data sheet

Rev. 1 — 31 May 2012

6 of 82

NXP Semiconductors

PCF8537

Industrial LCD driver for multiplex rates up to 1:8

7.2 Pin description

[1]

VLCD must be equal to or greater than VDD2.

[2]

When the internal VLCD generation is used, this pin drives the VLCD voltage. In this case pin VLCD is an

output. When the external supply is requested, then pin VLCD is an input and VLCD can be supplied on it. In

this case, the internal charge pump must be disabled (see Table 8).

Table 3.

Pin description of PCF8537AH and PCF8537BH

Symbol

Type

Description

PCF8537AH

PCF8537BH

1 to 32

S31 to S0

output

LCD segments

RESET

input

active low reset input

SDA

input/output I2C-bus serial data

input

SPI-bus chip enable - active LOW

SCL

input

I2C-bus serial clock

SCL

input

SPI-bus serial clock

input

I2C-bus slave address selection

SDIO

input/output SPI-bus serial data

37, 38,

T1 to T3

input

test pins; must be tied to VSS in

applications

CLK

input/output internal oscillator output, external

oscillator input

VSS

supply

ground supply

VDD1

supply

supply voltage 1

VDD2

supply

supply voltage 2

VLCD[1]

supply

LCD supply[2]

45 to 50

BP0 to BP5

output

LCD backplanes

S45/BP6

output

LCD segments for 1:6 multiplex drive

mode;

LCD backplanes for 1:8 multiplex drive

mode

S44/BP7

output

53 to 64

S43 to S32

output

LCD segments

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