PCF8831 datasheet(5/28 Pages) PHILIPS

5 / 28 page

2002 Aug 14

Philips Semiconductors

Preliminary speciﬁcation

STN RGB - 160 output row driver

PCF8831

PINNING

Note

1. Dummy pads are located at positions 1 (slanted), 162 to 186 and 243 to 272.

SYMBOL

PAD(1)

TYPE

DESCRIPTION

R159 to R0

2 to 161

LCD row outputs

RCLK

187

clock input to the shift register; data is transmitted with the positive clock

edge; connect RCLK to the RCLK output of the PCF8832 column driver

188

row pulse input; driven by the RP output of the PCF8832 column driver

189

frame inversion input; controls frame and N-line inversion; FI is synchronized

internally by the rising edge of RCLK; FI can change only when RP changes;

connect FI to the FI output of the PCF8832 column driver

SVM

190

input that switches the non-selected level (VM or VSS, depending on

ROWRES2) to all row outputs; connect SVM to the SVM output of the

PCF8832 column driver

ROWRES1

191

external reset input 1; when LOW, the shift register is reset at the next rising

edge of RCLK and all outputs (R0 to R159) go to their non-selected level;

connect ROWRES1 to the RESROW output of the PCF8832 column driver

ROWRES2

192

external reset input 2; when LOW, the non-selected level goes to VSS; when

HIGH, the non-selected level goes to VM; connect ROWREST to the

RESROW output of the PCF8832 column driver

R1F

193

inputs R1F (row block 1 ﬁrst), SW1 (swap row block 1) and SW2 (swap row

block 2) control the shift direction through the register and the order of the

PCF8832 column driver, or connect directly to VDD or VSS as required by the

display module configuration

SW1

194

SW2

195

T1 to T5

196 to 200

test inputs; connect to VSS for normal operation

VSS

201 to 207

logic power supply, negative; normally connected to system ground

VDD

208 to 214

logic power supply, positive; 2.4 to 3.5 V referred to VSS

215 to 221

MID-level LCD driving voltage; level is between VH and VL; output at rows for

non-selecting periods when ROWRES2 is HIGH; 1.25 to 2.0 V referred to VSS

VMH

222 to 228

auxiliary supply voltage for row switch; higher than VM; limited at VL +40V

229 to 235

HIGH-level LCD driving voltage; top level of the positive selecting pulse of row

outputs

236 to 242

LOW-level LCD driving voltage; bottom level of the negative selecting pulse of

row outputs

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