ST7549T
68 x 102 Dot Matrix LCD Controller/Driver
Product Description
The ST7549T is a driver & controller LSI for graphic dot-matrix liquid crystal display systems. It contains 102 segment
and 67 common with 1 ICOM driver circuits. This chip is connected directly to a microprocessor, accepts 3-line or 4-line
serial peripheral interface (SPI)¡BI2C interface or 8-bit parallel interface, display data can stores in an on-chip display
data RAM of 68 x 102 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 to drive liquid crystal, it is possible
to make a display system with the fewest components.
Features - Single-chip LCD controller & driver
- Driver Output Circuits
102 segment outputs / 67 common + 1 ICON common
- On-chip Display Data Ram
- Capacity: 68X102=6,936 bits
- Microprocessor Interface
- 8-bit parallel bi-directional interface with 6800-series or 8080-series
- 4-line SPI (serial peripheral interface) available (only write operation)
- 3-line SPI (serial peripheral interface) available
- I2C (Inter-Integrated Circuit) Interface
- On-chip Low Power Analog Circuit
- Generation of LCD supply voltage (externally Vout voltage supply is possible)
- Generation of intermediate LCD bias voltages
- Oscillator requires no external components (external clock also possible)
- Voltage converter (x4, x5)
- Voltage regulator(temperature gradient -0.05%/¢XC)
- Voltage follower
- On-chip electronic contrast control function (256 steps)
- External RESB (reset) pin
- Logic supply voltage range VDD1,2 -VSS
- 1.7 to 3.3V
- Display supply voltage range VLCD -VSS
- 4.5 to 13V
- Temperature range: -40 to +85 degree
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