PCF8831 datasheet(6/28 Pages) PHILIPS

6 / 28 page

2002 Aug 14

Philips Semiconductors

Preliminary speciﬁcation

STN RGB - 160 output row driver

PCF8831

FUNCTIONAL DESCRIPTION

7.1

Row driver

The row driver comprises high voltage outputs, level

shifters and logic circuits.

The row driver power supplies are:

• VH for the top level of selecting pulses

• VL for the bottom level of selecting pulses

• VM for the non-selecting level when ROWRES2 = HIGH;

the non-selecting level goes to VSS when

ROWRES2 = LOW (active)

• VMH is an intermediate auxiliary supply

• VDD and VSS for the logic circuits.

7.2

80-bit shift register

Two shift registers of 80 bits each are contained in the

PCF8831 row driver. With ROWRES1, the complete shift

two shift registers can be configured for different

applications by row control signals R1F, SW1 and SW2.

7.3

Row control

Row control signals SW1, SW2 and R1F control the shift

direction through the register and the order of the register

(see Fig.2). Some switching combinations require the

order of one or both shift registers to be swapped as

shown by the example in Fig.3. All row control

combinations are shown in Table 1, these can be software

controlled when connected to the corresponding row

control signals of the PCF8832 column driver.

ndbook, full pagewidth

MGW630

SW1

R79

SW2

SHIFT DIRECTION

SW1

R1F

SHIFT REGISTER 1

LCD ROW OUTPUTS

R80

SW1

R159

SW2

R1F

SHIFT REGISTER 2

LCD ROW OUTPUTS

Fig.2 Shift directions; R1F = 1.

handbook, full pagewidth

MGW631

R79

SW1

SW2

R1F

SHIFT REGISTER 1

LCD ROW OUTPUTS

R159

SW1

R80

SW2

R1F

SHIFT REGISTER 2

LCD ROW OUTPUTS

Fig.3 Row swapping; SW1 = SW2 = 1.

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