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 VCOM buffer. 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.
The STVM100 is a programmable VCOM adjustment solution designed for thin-film transistor (TFT) liquid-crystal displays (LCDs) and e-paper applications. It functions as a digital replacement for mechanical potentiometers to remove flickers in LCDs and avoid the ghosting effect in e-paper displays. The device features an I2C interface and an adjustable sink current output to drive an external resistive voltage divider for VCOM adjustment.
The STVM100 allows factory operators to physically view the screen during VCOM adjustment, significantly reducing labor costs and enabling automation. Once the desired VCOM setting is achieved, it is stored in an internal EEPROM and automatically recalled during each power-up. The device is available in 8-pin TDFN8 or TSSOP8 packages and operates with logic supply voltages from 2.25 V to 3.6 V.
| Interface | I2C interface, slave address: 1001111 |
|---|---|
| Logic supply voltage | 2.25 V to 3.6 V |
| AVDD operating voltage (VDD 2.6V to 3.6V) | 4.5 V to 20 V |
| AVDD operating voltage (VDD 2.25V to 3.6V) | 4.5 V to 13 V |
| Maximum interface bus speed | 400 kHz |
| Operating temperature | -40 °C to 85 °C |
| Package options | 8-pin 3 mm x 3 mm TDFN8 or TSSOP8 |
The slave address is 1001111.
The desired VCOM setting is stored in an internal EEPROM and is automatically recalled during each power-up.
The maximum interface bus speed is 400 kHz.