PCF8820 datasheet(47/60 Pages) PHILIPS

47 / 60 page

2000 Dec 07

Philips Semiconductors

Product speciﬁcation

× 101 Grey-scale/ECB colour dot matrix

LCD driver

PCF8820

13.4

Application for COG

The PCF8820 physical pad positions are optimized for

single plane wiring e.g. for Chip-On-Glass (COG) display

modules (see Fig.30). The pad lines are as follows:

• 3 input/output lines: SDA, SCL and RES

• 101 column driver lines

• 33 and 34 row driver lines

• pads SA0, SA1 and OSC can be tied in the application

to appropriate levels.

For COG applications, it is recommended that the Indium

Tin Oxide (ITO) track resistance is minimized for the I/O

and power supply connections. These connections should

have an optimum track resistance of <50

Ω for the power

supply connections and <100

Ω for the I/O connections.

Increasing the track resistance reduces the performance

and increases the current consumption.

The common supply resistor values especially, have to be

minimized (<5

Ω for high supply voltage VP1, VLCD and

GND).

The minimum value required for the external capacitors is:

• Cext1 > 470 nF (Cext1 >Cext2 recommended)

• Cext2 > 100 nF (470 nF to 1 µF recommended).

A higher value of the capacitors is recommended to reduce

the ripple voltage.

handbook, full pagewidth

MGT137

LCD

(67

× 101 pixels)

VP1

I/O

GND

Cext1

Cext2

Rsupply

Rcommon

RI/O

VLCD

PCF8820

101 colum drivers

34 row drivers

33 row drivers

Fig.30 Application diagram for COG display module.

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