PCF8531USLASH2 datasheet(6/44 Pages) PHILIPS

6 / 44 page

2000 Feb 11

Philips Semiconductors

Product speciﬁcation

× 128 pixel matrix driver

PCF8531

Notes

1. If the on-chip oscillator is used, this input must be connected to VDD1.

2. If the internal VLCD generation is used, VLCDOUT, VLCDIN and VLCDSENSE must be connected together.

3. If an external VLCD is used in the application, then pin VLCDOUT must be left open circuit, otherwise the chip will be

damaged.

4. If only the internal Power-on reset is used, this input must be connected to VDD1.

5. VDD1 is for the logic supply, VDD2, and VDD3 are for the voltage multiplier. For split power supplies, VDD2 and VDD3

must be connected together. If only one supply voltage is available, VDD1, VDD2 and VDD3 must be connected

together.

6. Serial data acknowledge for the I2C-bus. By connecting SDACK to SDA externally, the SDA line becomes fully

I2C-bus compatible. Having the acknowledge output separated from the serial data line is advantageous in

Chip-On-Glass (COG) applications. In COG applications where the track resistance from the SDACK pad to the

system SDA line can be significant, a potential divider is generated by the bus pull-up resistor and the Indium Tin

Oxide (ITO) track resistance. It is possible that the PCF8531 will not be able to create a valid logic 0 level during the

acknowledge cycle. By splitting the SDA input from the SDACK output, the device could be used in a mode that

ignores the acknowledge bit. In COG applications where the acknowledge cycle is required, it is necessary to

minimize the track resistance from the SDACK pad to the system SDA line to guarantee a valid LOW level.

7. If ENR is connected to VSS, Power-on reset is disabled; to enable Power-on reset ENR should be connected to VDD1.

8. In the application, this input must be connected to VSS.

9. VSS1 and VSS2 must be connected together.

10. In the application, T2 must be left open circuit.

C0 to C127

104 to 231

LCD column driver outputs

R33

232

LCD row driver output; icon row

R31

233

LCD row driver output

R29

234

LCD row driver output

R27

235

LCD row driver output

R25

236

LCD row driver output

R23

237

LCD row driver output

R21

238

LCD row driver output

R19

239

LCD row driver output

R17

240

LCD row driver output

R15

241

LCD row driver output

R13

242

LCD row driver output

R11

243

LCD row driver output

244

LCD row driver output

245

LCD row driver output

246

LCD row driver output

247

LCD row driver output

248

LCD row driver output

SYMBOL

PAD

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