Document
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
BLOCK DIAGRAM COM1 COM2 COM3
SG52
CT6523
SG5 SG4 SG3 SG2 SG1
VDD1 VDD2
/INH
COMMON DRIVER
SEGMENT DRIVER & LATCH
OSC
DI CLK
CE VDD VSS
CLOCK GENERATOR
ADDRESS DETECTOR
SHIFT REGISTER
CT6523 V1.0
-2-
June, 2006
1/3 Duty General Purpose LCD Driver IC
CT6523
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
V SS
OUTPUT PIN: COM1 TO COM3, SG1 TO SG52 VDD VDD1
VSS
VDD2
CT6523 V1.0
-3-
June, 2006
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
SG48 SG47 SG46 SG45 SG44 SG43 SG42 SG41 SG40 SG39 SG38 SG37 SG36 SG35 SG34 SG33
1/3 Duty General Purpose LCD Driver IC
PIN CONFIGURATION
SG49 SG50 SG51 SG52 COM1 COM2 COM3 VDD
/INH VDD1 VDD2
VSS OSC
CE CLK
DI
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
CT6523
CT6523
32 SG32 31 SG31 30 SG30 29 SG29 28 SG28 27 SG27 26 SG26 25 SG25 24 SG24 23 SG23 22 SG22 21 SG21 20 SG20 19 SG19 18 SG18 17 SG17
SG1 SG2 SG3 SG4 SG5 SG6 SG7 SG8 SG9 SG10 SG11 SG12 SG13 SG14 SG15 SG16
CT6523 V1.0
-4-
June, 2006
1/3 Duty General Purpose LCD Driver IC
CT6523
PIN DESCRIPTION
Pin Name SG1 to SG52 COM1 to COM3
VDD
/INH
VDD1
VDD2
VSS OSC CE CLK
DI
I/O Description
O
Segment Output Pins Common Driver Output Pins
- Power Supply
Display OFF Control Input Pin
I When this pin is Low, the display is forcibly turned off.
(SG1~SG52, COM1~COM3 are set to Low) (see Note)
Used for the 2/3 Bias Voltage when the Bias Voltages are
I provided externally. Connect to VDD2 when 1/2 bias is
used.
Used for 1/3 Bias Voltage when the Bias Voltage are
I provided externally. Connect to VDD1 when 1/2 Bias is
used.
- Ground Pin
I/O Oscillation Input/Output Pin
I Chip Enable Pin
I Synchronization Clock
I Transfer Data Pin
Pin No. 1~52 53~55 56
57
58
59
60 61 62 63 64
Note: 1. When /INH = Low: Serial data transfers can be performed when the display is forcibly off.
CT6523 V1.0
-5-
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
CT6523
CONTROL DATA
DR: 1/2 BIAS DRIVE OR 1/3 BIAS DRIVE SWITCHING CONTROL DATA.
DR is the 1/2 bias drive or 1/3 bias drive switching control data bit. It is used to select either 1/2 bias drive or 1/3 bias drive. When this pin is set to “0” the 1/2 bias drive is selected. When this pin is set to “1’, the 1/3 bias drive is selected. Please refer to the table below for the DR settings.
DR Drive Type “0” 1/2 Bias Drive “1” 1/3 Bias Drive
SC: SEGMENT ON/OFF CONTROL DATA
SC is the Segment ON/OFF Control Data Bit. It is used to select the state of the segments. If the SC is set to “0”, then the Segment Display are turned ON, however, if the SC is set to “1”, the Display State is OFF. Please refer to the table below.
SC Display State “0” ON “1” OFF
It should be noted that when the segments are turned off via the SC setting (SC=”1”), the segments are turned off the outputting of the segment OFF waveforms from the Segment Output Pins.
BU: NORMAL MODE/POWER SAVING MODE CONTROL DATA BIT
BU is the Normal Mode/Power Saving Mode Control Data Bit. It is used to select either the Normal Mode or the Power saving Mode. When the BU is set to “0”, the Normal Mode is enabled, however, if the.