PCF8531 datasheet(40/51 Pages) NXP

40 / 51 page

PCF8531

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Product data sheet

Rev. 05 — 10 August 2010

40 of 51

NXP Semiconductors

PCF8531

34 x 128 pixel matrix driver

15.3 Power supply connections for external VLCD generation

15.4 Information about VLCD connections

VLCDIN — This input is used for generating the 5 LCD bias levels. It is the power supply for

the bias level buffers.

VLCDOUT — This is the VLCD output if VLCD is generated internally. It is the output of the

charge pump. In this case pin VLCDOUT must be connected to VLCDIN and to VLCDSENSE

(see Figure 31). VLCDOUT must be left open circuit when VLCD is supplied from an external

source (see Figure 32).

VLCDSENSE — When using the internal VLCD generation, this pin must be connected to

VLCDOUT and VLCDIN (see Figure 31). When using an external VLCD supply it must be

connected to VLCDIN or to ground (see Figure 32).

Fig 31. Recommended VLCD connections for internal VLCD generation

013aaa356

VSS2

VLCDIN

VLCDOUT

VLCDSENSE

μF

Remark: When using an external VLCD, the internal VLCD generator must never be switched on

otherwise damages will occur.

Fig 32. Recommended VDD connections for external VLCD generation

013aaa358

VLCDIN

VLCDOUT

VLCDSENSE

n.c.

4.0 V to 9.0 V

μF

VLCDIN

VLCDOUT

VLCDSENSE

n.c.

4.0 V to 9.0 V

VDD1

VDD2

VDD3

VSS1

VSS2

GND

1.8 V (1.9 V) to 5.5 V

μF

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