PCF8811USLASH2DASLASH1 datasheet(17/81 Pages) NXP

17 / 81 page

PCF8811_4

Product data sheet

Rev. 04 — 27 June 2008

17 of 81

NXP Semiconductors

PCF8811

80 x 128 pixels matrix LCD driver

7.1.14 R/W/WR

Input to select read or write mode when the 6800 parallel interface is selected. Not used in

the serial and I2C-bus mode and must be connected to VDD1 or VSS1.

7.1.15 E/RD

E is the clock enable input for the 6800 parallel bus. Not used in the serial or I2C-bus

interface and must be connected to VDD1 or VSS1.

7.1.16 SCLH/SCE

Input to select the chip and so allowing data or commands to be clocked in or input for

serial clock when the I2C-bus interface is selected.

7.1.17 SDAH

I2C-bus serial data input. When not used, it must be connected to VDD1 and VSS1.

7.1.18 SDAHOUT

SDAHOUT is the serial data acknowledge output for the I2C-bus interface.

• By connecting SDAHOUT to SDAH externally, the SDAH line becomes fully I2C-bus

compatible

• The acknowledge output is separated from the serial data line due to the following

reasons:

– In COG applications where the track resistance from the SDAHOUT pad to the

system SDAH line can be signiﬁcant, a potential divider is generated by the bus

pull-up resistor and the ITO track resistance

– It is possible that during the acknowledge cycle the PCF8811 will not be able to

create a valid LOW level

– By splitting the SDAH input from the SDAHOUT 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 SDAHOUT pad to the system SDAH line to

guarantee a valid LOW level

• When not used it must be connected to VDD1 or VSS1.

7.1.19 DB7 to DB0

These input/output lines are used by several interfaces as described below. When not

used in the serial interface or the I2C-bus interface they must be connected to VDD1 or

VSS1.

7.1.19.1

DB7 to DB0 (parallel interface)

8-bit bidirectional bus. DB7 is the MSB.

7.1.19.2

DB7, DB6 and DB5 (serial interface)

• DB7 is used for serial input data (SDATA) when the serial interface is selected

• DB6 (SCLK) is used for the serial input clock when the serial interface is selected

• DB5 is used as the serial output of the serial interface (SDO)

PCF8811U/2DA/1 数据表(PDF) 17 Page - NXP Semiconductors

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