PCF88331 datasheet(52/112 Pages) PHILIPS

52 / 112 page

2003 Feb 14

Philips Semiconductors

Objective speciﬁcation

STN RGB - 132

× 132 × 3 driver

PCF8833

6.2.39

SET MULTIPLICATION FACTOR

The Set multiplication factor (SETMUL) command sets the multiplication factor of voltage multiplier 1. A detailed

explanation of the LCD voltage supply architecture is given in Section 7.8.

The different multiplication factor settings for voltage multiplier 1 are given in Table 63.

Table 62 Set multiplication factor register bits; note 1

Note

1. X = don’t care.

Table 63 Multiplication factor settings voltage multiplier

Note

1. Reset state.

6.2.40

SET TCVOP SLOPES A, B, C AND D

The Set TCVOP slopes A, B, C and D (TCVOPAB and TCVOPCD) command splits the temperature range into 4 parts

and can be programmed by using the following commands.

Due to the temperature dependency of the liquid crystals viscosity, the LCD controlling voltage VLCD might have to be

adjusted at different temperatures to maintain optimum contrast.

There are four equally spaced temperature regions. For each temperature region a different temperature coefficient can

be selected. Each coefficient can be selected from a choice of eight different slopes, or multiplication factors

(see Table 66) by setting TCVOPAB and TCVOPCD. The controlled VLCD will not be changed linearly, but in 40 mV steps

(parameter b in Table 47). Slopes SLA, SLB, SLC and SLD are overwritten by OTP values if these are set.

Table 64 Set TCVOP slopes A and B register bits; note 1

Note

1. X = don’t care.

D/C

D7D6D5D4D3D2D1D0

DEFAULT

011000010

C2H

XXXXXX

03H

MULTIPLICATION FACTOR

× multiplication

× multiplication; note 1

D/C

76543210

DEFAULT

011000011

C3H

SLB2

SLB1

SLB0

SLA2

SLA1

SLA0

34H

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