PCF8536AT/1 View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

MFG CO.

PCF8536AT/1

Universal LCD driver for low multiplex rates including a 6 channel PWM generator

NXP Semiconductors. 

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NXP Semiconductors

PCF8536

Universal LCD low multiplex driver with 6 channel PWM generator

D

=

-V----o---n----R---M----S---

VoffRMS

=

a----2---+-----2----a----+-----n--

a2 – 2a + n

(6)

It should be noted that VLCD is sometimes referred to as the LCD operating voltage.

8.4.1 Electro-optical performance

Suitable values for Von(RMS) and Voff(RMS) are dependent on the LCD liquid used. The

RMS voltage, at which a pixel will be switched on or off, determine the transmissibility of

the pixel.

For any given liquid, there are two threshold values defined. One point is at 10 % relative

transmission (at Vth(off)) and the other at 90 % relative transmission (at Vth(on)), see

Figure 14. For a good contrast performance, the following rules should be followed:

VonRMS  Vthon

(7)

VoffRMS  Vthoff

(8)

Von(RMS) and Voff(RMS) are properties of the display driver and are affected by the selection

of a, n (see Equation 4 to Equation 6) and the VLCD voltage.

Vth(off) and Vth(on) are properties of the LCD liquid and can be provided by the module

manufacturer.

It is important to match the module properties to those of the driver in order to achieve

optimum performance.

100 %

90 %

10 %

Vth(off)

Vth(on)

VRMS [V]

OFF

SEGMENT

GREY

SEGMENT

ON

SEGMENT

013aaa494

Fig 14. Electro-optical characteristic: relative transmission curve of the liquid

PCF8536

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 1 — 6 October 2011

© NXP B.V. 2011. All rights reserved.

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