PCF2119AUSLASH2DASLASH2 datasheet(6/79 Pages) NXP

6 / 79 page

PCF2119X_5

Product data sheet

Rev. 05 — 13 August 2009

6 of 79

NXP Semiconductors

PCF2119x

LCD controllers/drivers

[1]

Always put VDD2 =VDD3.

[2]

When the I2C-bus is used, the parallel interface pin E must be LOW.

[3]

The substrate (rear side of the die) is wired to VSS but should not be electrically connected.

[4]

On the device connected to VSS1.

[5]

When the parallel bus is used, the pins SCL and SDA must be connected to VSS1 or VDD1; they must not be

left open-circuit.

[6]

In the I2C-bus read mode, ports DB7 to DB4 and DB2 to DB0 should be connected to VDD1 or left

open-circuit.

[7]

When the 4-bit interface is used without reading out from the PCF2119x (bit R/W is set permanently to

logic 0), the unused ports DB4 to DB0 can either be set to VSS1 or VDD1 instead of leaving them

open-circuit.

R/W

158

read/write input

• pin R/W = HIGH selects the read operation

• pin R/W = LOW selects the write operation

• this pin has an internal pull-up resistor

159

• this pin has an internal pull-up resistor

DB0 to DB2,

DB3/SA0,

DB4 to DB7

160 to 162,

163,

164 to 167

[6][7

]

8 bit bidirectional data bus (bit 0 to bit 7)

• the 8-bit bidirectional data bus (3-state) transfers data

between the microcontroller and the PCF2119x

• pin DB7 may be used as the busy ﬂag, signalling that

internal operations are not yet completed

• 4-bit operations the 4 higher order lines DB7 to DB4 are

used, DB3 to DB0 must be left open-circuit

• data bus line DB3 has an alternative function (SA0) as the

I2C-bus address pin

• each data line has its own internal pull-up resistor

OSC

168

oscillator or external clock input

• when the on-chip oscillator is used this pin must be

connected to VDD1

Table 3.

Pin description …continued

Symbol

Description

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