PCA8530DUGSLASHDAZ datasheet(15/103 Pages) NXP

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PCA8530

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Product data sheet

Rev. 2 — 25 September 2014

15 of 103

NXP Semiconductors

PCA8530

Automotive 102 x 4 Chip-On-Glass LCD segment driver

8.3 Charge pump and LCD bias control commands

8.3.1 Command: Charge-pump-ctrl

The Charge-pump-ctrl command enables or disables the internal VLCD generation and

controls the charge pump voltage multiplier settings.

8.3.2 Command: Set-VLCD

The Set-VLCD command allows setting the LCD voltage.

A value of 0h corresponds to VLCD = 4 V and values equal or higher than 10Ch

correspond to VLCD = 12 V without temperature compensation. Every LSB change

corresponds to a VLCD programming step of 0.03 V. For further information, see

Table 14.

Charge-pump-ctrl - charge pump control command bit description

Bit

Symbol

Value

Description

-R/W

fixed value

RS[1:0]

fixed value

7 to 4

1100

fixed value

3CPE

charge pump status

charge pump disabled;

no internal VLCD generation;

external supply of VLCD

charge pump enabled;

internal VLCD generation;

no external supply of VLCD

2 to 0

CPC[2:0]

charge pump voltage multiplier setting

000

VLCD = 2  VDD2

001

VLCD = 3  VDD2

010

VLCD = 4  VDD2

011

VLCD = 5  VDD2

100 to 111

VLCD = VDD2 (direct mode)

Table 15.

Set-VLCD - Set-VLCD command bit description

Bit

Symbol

Value

Description

Set-VLCD-MSB

-R/W

fixed value

RS[1:0]

fixed value

7 to 5

010

fixed value

4 to 0

V[8:4]

set VLCD MSB

00000 to

11111

the 5 most significant bits of V[8:0]

Set-VLCD-LSB

-R/W

fixed value

RS[1:0]

fixed value

7 to 4

0110

fixed value

3 to 0

V[3:0]

set VLCD LSB

0000 to 1111

the 4 least significant bits of V[8:0]

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