www.nxp.com

© 2011 NXP Semiconductors N.V.

All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The

information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and

may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof

does not convey nor imply any license under patent- or other industrial or intellectual property rights.

Date of release: November 2011

Document order number: 9397 750 17189

Printed in the Netherlands

per`channel`allow`to`control`2`RGB`backlights`with`a`spectrum`

of`more`than`2`million`colors.`Each`channel`can`also`be`used`

for`static`LED`drive`or`as`logic`output.

The`PCx8536`generates`the`drive`signals`for`any`multiplexed`

LCD`containing`up`to`eight`backplanes,`up`to`44`segments,`

and`up`to`320`elements.`4,`6,`or`8`backplanes`can`be`driven.`

The`320`segments`can`include`up`to`40`seven-segment`digits,`

up`to`20`fourteen-segment`alphanumeric`characters,`or`any`

graphic`of`up`to`320`elements.`The`frame`frequency`can`

be`programmed`in`the`range`of`60`to`300`Hz`in`steps`of`10`

Hz.`The`reference`oscillator`is`factory`calibrated.`The`device`

compensates`the`DC`offset`voltage`across`the`LCD`in`line`

inversion`mode,`or`in`frame`inversion`mode`(selectable).

The`LCD`supply`range`from`2.5`V,`for`use`with`low-threshold`

LCDs,`up`to`9.0`V`for`high-threshold`TN`LCDs.`The`digital`

power`supply`can`be`from`1.8`to`5.5`V,`and`the`logic`supply`

can`be`separated`from`the`LCD`supply.`Also,`to`avoid`flicker`

of`the`display,`the`PWM`and`LCD`frame`frequencies`can`be`

set`independently.`Backplane`swapping`eases`PCB`design`

by`making`it`possible`to`move`the`backplane`and`segment`

outputs`from`one`side`to`the`other.`

Integrated PWM controller for LED backlighting and button lighting

Ordering information

PCx8536BT (SPI version) block diagram

PWM Controller



For LED Backlighting



For LED Button Lighting

PWM 1

PWM 2

PWM 6

PCx8536

MCU

Easy color mixing

PWM 3

Larger current /

higher voltage

Each of the 6 PWM channels

can be controlled

independently

NXP

BC847 /

BC857

PCA8536AT/Q900/1

Yes

TSSOP56

SOT364-1

PCA8536BT/Q900/1

Yes

SPI-bus

TSSOP56

SOT364-1

PCF8536AT/1

-

TSSOP56

SOT364-1

PCF8536BT/1

-

SPI-bus

TSSOP56

SOT364-1