PCF8820U Philips Semiconductors, PCF8820U Datasheet - Page 47

• Manufacturer Part Number: PCF8820U
• Description: 67 x 101 Grey-scale/ECB colour dot matrix LCD driver
• Manufacturer: Philips Semiconductors

Philips Semiconductors
13.4
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:
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
supply connections and <100
Increasing the track resistance reduces the performance
and increases the current consumption.
2000 Dec 07
handbook, full pagewidth
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.
67 101 Grey-scale/ECB colour dot matrix
LCD driver
Application for COG
for the I/O connections.
Fig.30 Application diagram for COG display module.
34 row drivers
R I/O
I/O
for the power
3
(67
PCF8820
V P1
101 pixels)
LCD
C ext1
101 colum drivers
GND
47
The common supply resistor values especially, have to be
minimized (<5
GND).
The minimum value required for the external capacitors is:
A higher value of the capacitors is recommended to reduce
the ripple voltage.
C ext2
C
C
ext1
ext2
V LCD
> 470 nF (C
> 100 nF (470 nF to 1 F recommended).
R supply
R common
MGT137
33 row drivers
for high supply voltage V
ext1
> C
ext2
recommended)
Product specification
PCF8820
P1
, V
LCD
and