PT6553_10 Datasheet, PDF (22/41 Pages) Princeton Technology Corp – LCD Driver IC with Key Input Function

LCD Driver IC with Key Input Function
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URL: http://www.princeton.com.tw
PT6553
STATES OF THE PT6553 INTERNAL BLOCK DURING THE RESET PERIOD
Clock Generator
When the reset function is initialized, the base clock is terminated. The OSC Pin state, however is
determined after the S0 and S1 control data bits are transferred.
Common Driver, Segment Driver & Latch
When the reset function is initialized, the display is turned off. The display data, however, can be
inputted to the latch circuit in this state.
Key Scan
When the reset function is applied, the circuit is set to the initial state and at the same time, the key
scan operation is disabled.
Key Buffer
When the reset function is initialized, all the key data are set to "LOW".
Interface, Control Register, Shift Register
These circuits are not reset since serial data transfer is possible.
COM1 COM2 COM3
SG40
SG5 SG4/P4 SG3/P3 SG2/P2 SG1/P1
TEST
COMMON
DRIVER
SEGMENT DRIVER & LATCH
OSC
DO
DI
CLK
CE
VDD
VDD1
VDD2
VSS
CLOCK
GENERATOR
INTERFACE
VDET
Blocks that are reset
SHIFT REGISTER
CONTROL
REGISTER
KEY BUFFER
KEY SCAN
KI5
KI1 KO6 KO3 SG42/KO2 SG41/KO1
PT6553 V1.7
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November, 2007