ST7541
4 Gray Scale Dot Matrix LCD Controller/Driver
Product Description
The ST7541 is a driver & controller LSI for 4-level gray scale graphic dot-matrix liquid crystal display systems. This chip is connected directly to a microprocessor, accepts Serial Peripheral Interface (SPI),IIC or 8-bit parallel display data and stores in an on-chip display data RAM of 128 x 129 x 2 bits. 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.
Features
- Driver Output Circuits
-- 128 segment outputs / 128+1 common outputs
- Applicable Duty Ratios
-- Various partial display
-- Partial window moving & data scrolling
- On-chip Display Data RAM
-- Capacity: 128 ¡Ñ 129 ¡Ñ 2= 33,024 bits
- Microprocessor Interface
-- 8-bit parallel bi-directional interface with 6800-series or 8080-series
-- 4-line serial interface (4-line-SIF)
-- 3-line serial interface (3-line-SIF)
-- IIC serial interface
- On-chip Low Power Analog Circuit
-- On-chip oscillator circuit
-- Voltage converter (x3, x4, x5 or x6)
-- Voltage regulator (temperature coefficient: -0.125%/ C, or external input)
-- On-chip electronic contrast control function (64 steps X 8)
-- Voltage follower (LCD bias : 1/5 to 1/12)
- Operating Voltage Range
-- Supply voltage (VDD): 1.8 to 3.3V
-- LCD driving voltage (VLCD = V0 - VSS): 4.0 to 15.0 V
- Package Type
-- Application for COG
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