PT6554_10 Datasheet, PDF (6/30 Pages) Princeton Technology Corp – LCD Driver IC

PT6554
PIN DESCRIPTION
Pin
SG1/P1 to
SG4/P4
SG5 to SG39
COM1
COM2
COM3
COM4
KS1/SG40,
KS2/SG41,
KS3 to KS6
KI1to KI5
OSC
CE
CLK
DI
DO
TEST
VDD1
VDD2
VDD
VSS
Pin No.
Function
Active I/O
1 to 4
5 to 39
Segment outputs for displaying the display data
transferred by serial data input.
The SG1/P1 to SG4/P4 pins can be used as
general-purpose output ports under serial data control.
-
O
40
41
Common driver outputs
42
The frame frequency f_O is given by: f_O=(fosc/512)Hz
43
-
O
Key scan outputs
Although normal key scan timing lines require diodes to
44
45
46 to 49
be inserted in the timing lines to prevent shorts, since
these outputs are unbalanced CMOS transistor outputs,
these outputs will not be damaged by shorting when
these outputs are used to from a key matrix. The
-
O
KS1/SG40 and KS2/SG41 pins can be used as segment
outputs when so specified by the control data
50 to 54
Key scan inputs.
These pins have built-in pull-down resistors.
H
I
Oscillator connection.
60
An oscillator circuit is formed by connecting an external
-
I/O
resistor and capacitor at this pin.
Serial data interface connections to the controller. Note
62
that DO, being an open-drain output, requires a pull-up
H
I
63
resistor.
I
64
CE: Chip enable
-
I
CLK: Synchronization clock
61
DI: Transfer data
DO: Output data
-
O
55
This pin must be connected to ground.
-
I
Used for applying the LCD drive 2/3 bias voltage
57
externally. Must be connected to VDD1 when a 1/2 bias -
I
drive scheme is used.
Used for applying the LCD drive 1/3 bias voltage
58
externally. Must be connected to VDD1 when a 1/2 bias -
I
drive scheme is used.
56
Power supply connection. Provide a voltage of between
4.5 and 6.0V
-
-
59
Power supply connection. Connect to ground.
-
-
Handling
when unused
Open
Open
Open
GND
VDD
GND
Open
-
Open
Open
-
-
V1.4
6
June 2010