STVM100 2 I C LCD/e-paper VCOM calibrator Datasheet - production data Applications TFT-LCD panels e-paper and e-book displays TDFN8 (3 mm x 3 mm) (DC) Description 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 TSSOP8 (3 mm x 3 mm) (DS) display refresh). It can replace a mechanical potentiometer, so that the factory operator can physically view the front screen when performing Features the VCOM adjustment. This significantly reduces labor costs, increases reliability, and enables 2 I C interface, slave address: 1001111 automation. 7-bit adjustable sink current output 2 The STVM100 provides a digital I C interface to 2.25 V to 3.6 V logic supply voltage V DD control the sink current output (I ). This output OUT drives an external resistive voltage divider, which AV operating voltages DD can then be applied to an external V buffer. COM 4.5 V to 20 V for V from 2.6 V to 3.6 V DD Three external resistors R , R , and R 1 2 SET 4.5 V to 13 V for V from 2.25 V to 3.6 V DD determine the highest and lowest value of the EEPROM for storing the optimum V setting COM V . An increase in the output sink current will COM lower the voltage on the external divider so that Guaranteed monotonic output over operating the V can be adjusted by 128 steps within this range COM range. Once the desired V setting is COM 400 kHz maximum interface bus speed achieved, it can be stored in the internal Operating temperature: 40 C to 85 C EEPROM that will be automatically recalled during each power-up. Available in an 8-pin 3 mm x 3 mm TDFN8 or 3 mm x 3 mm TSSOP8 package The STVM100 is available in an 8-pin, 3 mm x 3 mm TDFN8 or 3 mm x 3 mm TSSOP8 package. Table 1. Device summary Order code Optimum temperature range Package Packing STVM100DC6F 40 C to 85 C TDFN8 ECOPACK package, tape and reel STVM100DS6F 40 C to 85 C TSSOP8 ECOPACK package, tape and reel June 2013 DocID13236 Rev 9 1/28 This is information on a product in full production. www.st.comSTVM100 Contents Contents 1 Device overview 6 2 Device operation 8 2.1 2-wire bus characteristics and conditions 8 2.1.1 Bus not busy 8 2.1.2 Start data transfer 8 2.1.3 Stop data transfer 8 2.1.4 Data valid . 9 2.1.5 Acknowledge . 10 2.2 Read mode .11 2.3 Write mode .11 2.4 V power supply ramp-up 11 DD 3 Application information . 12 4 Maximum ratings . 14 5 DC and AC parameters 15 6 Typical operating characteristics . 18 7 Package mechanical data 24 8 Part numbering 26 9 Revision history . 27 DocID13236 Rev 9 3/28 3