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PCF2119VU-2

LCD controllers/drivers

Philips Electronics 

Philips Semiconductors

LCD controllers/drivers

Product specification

PCF2119X

6 PAD INFORMATION

The identification of each pad and its location is given in Chapter 18.

6.1 Pad functions

Table 1 Pad function description

SYMBOL

VDD1

VDD2, VDD3

VSS1

VSS2

VLCD1

VLCD2

VLCDSENSE

E

T1 to T3

R1 to R18;

R17DUP

C1 to C80

SCL

POR

PD

SDA

R/W

RS

DB0 to DB7

OSC

DESCRIPTION

Logic supply voltage.

High voltage generator supply voltages (always put VDD2 = VDD3).

This is the ground pad for all except the high voltage generator.

This is the ground pad for the high voltage generator.

This input is used for the generation of the LCD bias levels.

This is the VLCD output pad if VLCD is generated internally then pad VLCD2 must be connected to VLCD1.

The pad must be left open-circuit when VLCD is generated externally.

This input (VLCD) is used for the voltage multiplier’s regulation circuitry. This pad must be connected to

VLCD2 when using internal LCD supply and to VLCD1 and VLCD2 when using external LCD supply.

The data bus clock input is set HIGH to signal the start of a read or write operation; data is clocked in

or out of the chip on the negative edge of the clock; note 1.

These are three test pads. T1 and T2 must be connected to VSS1; T3 is left open-circuit and is not user

accessible.

LCD row driver outputs R1 to R18; these pads output the row select waveforms to the display;

R17 and R18 drive the icons. R17 has two pads R17 and R17DUP.

LCD column driver outputs C1 to C80.

I2C-bus serial clock input; note 1.

External power-on reset input.

PD selects the chip power-down mode; for normal operation PD = 0.

I2C-bus serial data input/output; note 1.

This is the read/write input. R/W selects either the read (R/W = 1) or write (R/W = 0) operation. This

pad has an internal pull-up resistor.

The RS input selects the register to be accessed for read and write. RS = 0, selects the instruction

register for write and the busy flag and address counter for read. RS = 1, selects the data register for

both read and write. This pad has an internal pull-up resistor.

The 8-bit bidirectional data bus (3-state) transfers data between the system controller and the

PCF2119x. DB7 may be used as the busy flag, signalling that internal operations are not yet

completed. In 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), when selected this is the I2C-bus

address pad. Each data line has its own internal pull-up resistor; note 1.

Oscillator or external clock input. When the on-chip oscillator is used this pad must be connected to

VDD1.

Note

1. When the I2C-bus is used, the parallel interface pad E must be at logic 0. In the I2C-bus read mode DB7 to DB4 and

DB2 to DB0 should be connected to VDD1 or left open-circuit.

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

open-circuit.

b) If the 4-bit interface is used without reading out from the PCF2119x (i.e. R/W is set permanently to logic 0), the

unused ports DB0 to DB4 can either be set to VSS1 or VDD1 instead of leaving them open-circuit.

2003 Jan 30

6

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