PCF8531 datasheet(25/51 Pages) NXP

25 / 51 page

PCF8531

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Product data sheet

Rev. 05 — 10 August 2010

25 of 51

NXP Semiconductors

PCF8531

34 x 128 pixel matrix driver

Linear temperature compensation is supported in the PCF8531. The temperature

coefficient of VLCD can be selected from eight values by setting bits TC[2:0] (see

Table 13).

Fig 13. VLCD as a function of liquid crystal temperature

mgs473

VLCD

°C

Table 11.

Instruction set

Instruction

I2C-bus

command[1]

I2C-bus command byte

Description

R/W

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

H1 and H0 = don’t care (H independent command page)

NOP

00000

00000no operation

write data

D7D6D5

D4D3D2D1

D0write data to

display RAM

set default H[1:0]

00000

00001select H[1:0] = 0

H1 = 0 and H0 = 0 (function and RAM command page)

instruction set

select command

page

function set

power-down

control; entry

mode

set Y address of

RAM

Set Y address of

RAM; 0

≤ Y ≤ 5

set X address of

RAM

Set X address of

RAM; 0

≤ X ≤ 127

H1 = 0 and H0 = 1 (display setting command page)

multiplex rate

set multiplex rate

display control

set display

configuration

bias system

BS2

BS1

BS0

set bias system

(BSx)

H1 = 1 and H0 = 0 (HV-gen command page)

HV-gen control

00000

001PRS

HVE

set VLCD

programming

range

HV-gen

configuration

00000

010S1

set voltage

multiplication

factor

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