1/3 Duty General Purpose LCD Driver IC
CT6523
DESCRIPTION
CT6523 is an LCD Driver IC which can drive up to 156 segments. It can be used for frequency display
in microprocessor-controlled radio receiver and in other display applications. CT6523 supports both
1/2 bias, 1/3 duty and 1/3 duty, 1/3 bias. Pin assignments and application circuit are optimized for easy
PCB layout and cost saving advantages.
FEATURES
• Up to 156 Segments Outputs
• 1/3 Duty - 1/2 Bias and 1/3 Duty - 1/3 Bias Drive Techniques
• Power Saving Mode and all Segments OFF Function
• Direct Display of Display Data without using a Decoder
• RC Oscillation Circuit
• Power Supply Voltage: 4.5 to 6V
• LCD Drive Bias Voltage can be provided internally or externally
• Available in 64 pins, QFP or LQFP
APPLICATIONS
• Electronic Dictionary / Translator
• P.O.S.
• Caller ID
• Pager
• Mini Compo
• Electronic Equipment with LCD Display
CT6523 V1.0
-1-
June, 2006
1/3 Duty General Purpose LCD Driver IC
FUNCTION DESCRIPTION
SERIAL DATA TRANSFER
CONDITION 1: CLK IS TERMINATED AT THE “LOW” LEVEL
CT6523
CONDITION 2: CLK IS TERMINATED AT THE “HIGH” LEVEL
Note:
1. Address: 41H
2. D1 to D156 = Display Data
When D1 to D156 are set to “1”, Display is turned ON.
When D1 to D156 are set to “0”, Display is turned OFF.
3. DR = 1/2 Bias Drive or 1/3 Bias Drive Switching Control Data
4. SC = Segment ON/OFF Control Data
5. BU = Normal Mode/Power-Saving Control Data
6. x = Not Relevant
For example, there are 63 segments that are being used, the 63 bits of display data (D94 to D156)
must be sent. Please refer to the diagram below.
8 BITS
67 BITS
10000010
D94 D95 D96
D154 D155 D156 DR SC BU X
←------------ ADDRESS
Note: x = Not Relevant
------------→
CT6523 V1.0
-6-
June, 2006
1/3 Duty General Purpose LCD Driver IC
1/3 DUTY, 1/3 BIAS DRIVE WAVEFORMS
CT6523
CT6523 V1.0
- 12 -
June, 2006
