PCF8576D datasheet(7/50 Pages) NXP

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PCF8576D

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Product data sheet

Rev. 10 — 14 February 2011

7 of 50

NXP Semiconductors

PCF8576D

Universal LCD driver for low multiplex rates

Functional description

The PCF8576D is a versatile peripheral device designed to interface any

microprocessor or microcontroller with a wide variety of LCDs. It can directly drive any

static or multiplexed LCD containing up to four backplanes and up to 40 segments.

The possible display configurations of the PCF8576D depend on the number of active

backplane outputs required. A selection of display configurations is shown in Table 4. All

of these configurations can be implemented in the typical system shown in Figure 4.

The host microprocessor or microcontroller maintains the 2-line I2C-bus communication

channel with the PCF8576D. The internal oscillator is enabled by connecting

pin OSC to pin VSS. The appropriate biasing voltages for the multiplexed LCD waveforms

are generated internally. The only other connections required to complete the system are

to the power supplies (VDD, VSS and VLCD) and the LCD panel chosen for the application.

7.1 Power-on reset

At power-on the PCF8576D resets to the following starting conditions:

• All backplane outputs are set to VLCD

• All segment outputs are set to VLCD

• The selected drive mode is: 1:4 multiplex with 1⁄3 bias

• Blinking is switched off

Table 4.

Selection of possible display configurations

Number of

Backplanes

Icons

Digits/Characters

Dot matrix/

Elements

7-segment

14-segment

160

160 (4

× 40)

120

120 (3

× 40)

280

80 (2

× 40)

140

240 (1

× 40)

The resistance of the power lines must be kept to a minimum.

For chip-on-glass applications, due to the Indium Tin Oxide (ITO) track resistance, each supply line

must be routed separately between the chip and the connector.

Fig 4.

Typical system configuration

HOST

MICRO-

PROCESSOR/

MICRO-

CONTROLLER

2CB

SDA

SCL

OSC

40 segment drives

4 backplanes

LCD PANEL

(up to 160

elements)

PCF8576D

SA0

VDD

VSS

VDD

VLCD

mdb079

≤

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