PCF8812USLASH2 datasheet(5/36 Pages) PHILIPS

5 / 36 page

2000 Nov 22

Philips Semiconductors

Product speciﬁcation

× 102 pixels matrix LCD driver

PCF8812

PINNING

PIN FUNCTIONS

7.1

Pin functions

7.1.1

ROW 0 TO ROW 64 ROW DRIVER OUTPUTS

These pads output the row signals.

7.1.2

COL 0 TO COL 101 COLUMN DRIVER OUTPUTS

These pads output the column signals.

7.1.3

VSS1 AND VSS2: NEGATIVE POWER SUPPLY RAILS

The 2 supply rails VSS1 and VSS2 must be connected

together.

7.1.4

VDD1 TO VDD3: POSITIVE POWER SUPPLY RAILS

VDD2 and VDD3 are the supply voltage for the internal

voltage generator. Both have the same voltage and may

be connected together outside of the chip. VDD1 is used as

supply for the rest of the chip. VDD1 can be connected

together with VDD2 and VDD3 but in this case care must be

taken to respect the supply voltage range

(see Chapter 13).

If the internal voltage generator is not used then VDD2 and

VDD3 must be connected to VDD1 or connected to power.

7.1.5

VLCDIN: LCD POWER SUPPLY

Positive power supply for the liquid crystal display.

An external LCD supply voltage can be supplied using the

VLCDIN pad. In this case VLCDOUT has to be left open-circuit

and the internal voltage generator has to be programmed

to zero. If the PCF8812 is in Power-down mode, the

external LCD supply voltage has to be switched off.

7.1.6

VLCDOUT: LCD POWER SUPPLY

Positive power supply for the liquid crystal display. If the

internal voltage generator is used, the two supply rails

VLCDIN and VLCDOUT must be connected together. If an

external supply is used this pin must be left open-circuit.

7.1.7

VLCDSENSE: VOLTAGE MULTIPLIER REGULATION

INPUT

(VLCD)

VLCDSENSE is the input of the internal voltage multiplier

regulation.

If the internal voltage generator is used then VLCDSENSE

must be connected to VLCDOUT. If a external supply voltage

is used then the VLCDSENSE can be let open-circuit or

connected to ground.

SYMBOL

PAD

DESCRIPTION

RES

external reset input

(active LOW)

ROW 32 to

ROW 19

2 to 15

LCD row driver outputs

ROW 0 to

ROW 18

18 to 36

LCD row driver outputs

COL0to

COL 101

37 to 138

LCD column driver

outputs

ROW 50 to

ROW 33

139 to 156

LCD row driver outputs

ROW 51 to

ROW 64

159 to 172

LCD row driver outputs

VDD1

174 to 179

supply voltage 1

VDD3

180

supply voltage 3

VDD2

181 to 193

supply voltage 2

OSC

194

oscillator input

SDIN

195

serial data input

D/C

196

data/command input

SCE

197

chip enable input

(active LOW)

198

test 2 output

SCLK

199

serial clock input

VSS2

200 to 213

negative power supply 2

VSS1

214 to 217

negative power supply 1

218

test 1 input

219

test 5 input

220

test 4 input

VSS1

221 and 222

negative power supply 1

223

test 3 input/output

VLCDIN

224 to 229

LCD supply voltage

VLCDOUT

230 to 236

voltage multiplier output

VLCDSENSE

237

voltage multiplier

regulation input (VLCD)

16, 17, 157,

158 and 173

dummy pads

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