PCF8531 datasheet(39/51 Pages) NXP

39 / 51 page

PCF8531

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Product data sheet

Rev. 05 — 10 August 2010

39 of 51

NXP Semiconductors

PCF8531

34 x 128 pixel matrix driver

15. Application information

15.1 Typical system configuration

The host microprocessor/microcontroller and the PCF8531 are both connected to the

I2C-bus. The SDA and SCL lines must be connected to the positive power supply via

pull-up resistors. The internal oscillator requires no external components. The appropriate

intermediate biasing voltage for the multiplexed LCD waveforms are generated on-chip.

The only other connections required to complete the system are to the power supplies

(VDD, VSS and VLCD) and suitable capacitors for decoupling VLCD and VDD.

15.2 Power supply connections for internal VLCD generation

Fig 29. Typical system configuration

mgs483

HOST

MICROPROCESSOR/

MICROCONTROLLER

LCD PANEL

VSS1,

VSS2

VSS

VDD(I2C)

VLCD

VDD1 to VDD3

VSS1, VSS2

SDA

SCL

PCF8531

Rpu

RES

128 column drivers

34 row drivers

Fig 30. Recommended VDD connections for internal VLCD generation

VDD1

VDD2

VDD3

VSS1

VSS2

GND

1.8 V (1.9 V) to 5.5 V

2.5 V to 4.5 V

013aaa354

μF

VDD1

VDD2

VDD3

VSS1

VSS2

GND

2.5 V to 4.5 V

013aaa355

μF

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