ST
Sitronix
1. INTRODUCTION
ST7637
65K 132
x
132 Color Dot Matrix LCD Controller/Driver
The ST7637 is a driver & controller LSI for 65K color graphic dot-matrix liquid crystal display systems. It generates 396
Segment and 132 Common driver circuits. This chip is connected directly to a microprocessor, accepts Serial Peripheral
Interface (SPI) or 8-bit/16-bit parallel display data and stores in an on-chip display data RAM. It performs display data RAM
read/write operation with no external operating clock to minimize power consumption. In addition, because it contains
power supply circuits necessary to drive liquid crystal, it is possible to make a display system with the fewest components.
2. FEATURES
Driver Output Circuits
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396 segment outputs / 132 common outputs
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3-line (9-bits) serial interface
On-chip Low Power Analog Circuit
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On-chip oscillator circuit
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Voltage converter (x2~x8) with internal capacitors.
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Extremely Few Outsider Components. (3 Capacitors)
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On-chip Voltage Regulator
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On-chip electronic contrast control function
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Voltage follower (LCD bias: 1/5~1/12)
Applicable Duty Ratios
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Various partial display
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Partial window moving & data scrolling
Gray-Scale Display
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4FRC & 31 PWM function circuit to display 64
gray-scale display
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Support 8 color mode (Idle mode)
Operating Voltage Range
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Supply Digital Voltage (VDD, VDD1): 1.65 to 3.0V
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Supply Analog Voltage (VDD2~VDD5): 2.4 to 3.3V
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LCD driving voltage (VOP = V0 - VSS): Max: 18V
On-chip Display Data RAM
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Capacity: 132 x 132 x 16 =278,784 bits
Color support by Interface
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256 colors (RGB)=(332) mode
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4k colors (RGB)=(444) mode
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65K colors (RGB)=(565) mode
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Truncated 262K colors (RGB)=(666) mode
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Truncated 16M colors (RGB)=(888) mode
LCD Driving Voltage (OTP)
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Contrast Adjustment Value is stored in the Built-In
OTP-ROM for better display quality.
LCD Driving setting suggestion
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VOP = 14V, BIAS=1/9. (VDD=2.8V)
♦
VOP=15.5V,BIAS=1/10. (VDD=2.8V)
Microprocessor Interface
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8/16-bit parallel bi-directional interface with 6800-series
or 8080-series
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4-line serial interface
Package Type
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Application for COG
ST7637
6800, 8080, 4-Line, 3-Line interface
Sitronix Technology Corp. reserves the right to change the contents in this document without prior notice.
Ver 1.6
1/210
2009/03