PCF8545ATTSLASHA datasheet(7/72 Pages) NXP

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PCF8545

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Product data sheet

Rev. 1 — 13 November 2013

7 of 72

NXP Semiconductors

PCF8545

Universal LCD driver for multiplex rates up to 1:8

Functional description

The PCF8545 is a versatile peripheral device designed to interface any microcontroller to

a wide variety of LCDs. It can directly drive any multiplexed LCD containing up to eight

backplanes and up to 44 segments.

8.1 Commands of PCF8545

The PCF8545 is controlled by 9 commands, which are defined in Table 5. Any other

combinations of operation code bits that are not mentioned in this document may lead to

undesired operation modes of PCF8545.

[1]

Information about control byte and register selection see Section 9.1 on page 36.

8.1.1 Command: initialize

This command generates a chip-wide reset. It has the same function as the RESET pin.

Reset takes 1 ms to complete.

8.1.2 Command: OTP-refresh

During production of the device, each IC is calibrated to achieve the specified accuracy of

the frame frequency. This calibration is performed on EPROM cells called One Time

Programmable (OTP) cells. The device reads these cells every time the OTP-refresh

command is sent. The OTP-refresh command has to be sent after a reset has been made

and before the display is enabled.

This command will be completed after a maximum of 30 ms and requires either the

internal or external clock to run. If the internal oscillator is not used, then a clock must be

supplied to the OSCCLK pin. If the OTP-refresh instruction is sent and no clock is present,

then the request is stored until a clock is available.

Remark: It is recommended not to enter power-down mode during the OTP refresh cycle.

Table 5.

Commands of PCF8545

Command name

selection

RS[1:0][1]

Bits

Reference

initialize

0001

011

Section 8.1.1

OTP-refresh

1111

000

Section 8.1.2

mode-settings

0101

BPS

INV

Section 8.1.3

oscillator-control

0001

1EFR

COE

OSC

Section 8.1.4

set-MUX-mode

0000

00M[1:0]

Section 8.1.5

set-bias-mode

0000

01B[1:0]

Section 8.1.6

frame-frequency

001FD[4:0]

Section 8.1.7

load-data-pointer

DP[5:0]

Section 8.1.8

write-RAM-data

D[7:0]

Section 8.1.9

Table 6.

Initialize - initialize command bit description

Bit

Symbol

Value

Description

7 to 0

00010110

fixed value

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