Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
LCD Driver IC with Key Input Function
PT6553
DESCRIPTION
PT6553 is an LCD Driver IC providing key scan circuitry which can accept up to a maximum of 30 keys,
thereby, reducing printed circuit board wiring. It can drive up to 126 segments and is capable of
controlling up to 4 general purpose output ports. The reset circuit provides on-chip voltage detection
making it possible to prevent incorrect displays. Pin assignments and application circuit are optimized
for easy PCB layout and cost saving advantages.
FEATURES
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Up to 126 segments outputs
Up to 4 general purpose output ports
Key input function (up to 30 Keys)
1/3 duty - 1/2 bias and 1/3 duty - 1/3 bias drive techniques
Sleep mode and all segments off function
Direct display of display data without using a decoder
On-chip voltage-detection type reset circuit
RC oscillation circuit
APPLICATIONS
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Cellular phone
Data bank, Organizer
Electronic dictionary/Translator
P.D.A.
P.O.S.
Information appliance
Caller ID
Pager
Electronic equipment with LCD display
PT6553 V1.7
-1-
November, 2007
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
LCD Driver IC with Key Input Function
PT6553
BLOCK DIAGRAM
COM1 COM2
COM3
SG40
SG5 SG4/P4 SG3/P3 SG2/P2 SG1/P1
TEST
COMMON
DRIVER
SEGMENT DRIVER & LATCH
SHIFT REGISTER
OSC
CLOCK
GENERATOR
CONTROL
REGISTER
DO
DI
CLK
CE
VDD
VDD1
VDD2
VSS
KEY SCAN
VDET
KEY BUFFER
INTERFACE
KI5
KI1
KO6
KO3
SG42/KO2 SG41/KO1
PT6553 V1.7
-2-
November, 2007
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
LCD Driver IC with Key Input Function
PT6553
INPUT/OUTPUT CONFIGURATIONS
The schematic diagrams of the input and output circuits of the logic section are shown below:
INPUT PIN: CLK, CE, DI
VDD
VSS
INPUT PIN: KI1 TO KI5
V
DD
VSS
OUTPUT PIN: DO
VDD
VSS
PT6553 V1.7
-3-
November, 2007
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
LCD Driver IC with Key Input Function
PT6553
OUTPUT PIN: SG1/P1 TO SG4/P4, SG5 TO SG40, SG41/KO1, SG42/KO2
VDD
VDD
V
DD
1
VSS
VSS
V
DD
2
OUTPUT PIN: KO3 TO KO6
VDD
VSS
OUTPUT PIN: COM1 TO COM3
V
DD
V
DD
2
V
SS
V
DD
2
PT6553 V1.7
-4-
November, 2007
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