The STVM100 is a programmable VCOM adjustment solution for thin-film transistor (TFT) liquid-crystal displays (LCDs) to remove “flickers”. It is also used in e-paper and e-book applications to avoid the “ghosting” effect (residual pixels after display refresh). It can replace a mechanical potentiometer, so that the factory operator can physically view the front screen when performing the VCOM adjustment. This significantly reduces labor costs, increases reliability, and enables automation.
The STVM100 provides a digital I2C interface to control the sink current output (IOUT). This output drives an external resistive voltage divider, which can then be applied to an external VCOMbuffer. Three external resistors R1, R2, and RSET determine the highest and lowest value of the VCOM. An increase in the output sink current will lower the voltage on the external divider so that the VCOMcan be adjusted by 128 steps within this range. Once the desired VCOMsetting is achieved, it can be stored in the internal EEPROM that will be automatically recalled during each power-up.
The STVM100 is available in an 8-pin, 3 mm x 3 mm TDFN8 or 3 mm x 3 mm TSSOP8 package.
**Key Features**
I2C interface, slave address: 1001111
7-bit adjustable sink current output
2.25 V to 3.6 V logic supply voltage VDD
AVDD operating voltages
4.5 V to 20 V for VDD from 2.6 V to 3.6 V
4.5 V to 13 V for VDD from 2.25 V to 3.6 V
EEPROM for storing the optimum VCOM setting
Guaranteed monotonic output over operating range
400 kHz maximum interface bus speed
Operating temperature: –40 °C to 85 °C
Available in an 8-pin 3 mm x 3 mm TDFN8 or 3 mm x 3 mm TSSOP8 package
