ISL24211
Programmable V_COM Calibrator with EEPROM and Output Buffer

Key Features

• 8-bit, 256-Step, Adjustable Sink Current Output
• 60MHz V_COM Buffer/Amplifier
• 4.5V to 19.0V Analog Supply Range for Normal Operation (10.8V Minimum Analog Supply Voltage for Programming)
• 2.25V to 3.6V Logic Supply Voltage Operating Range
• 400kHz, I²C Interface
• On-Chip 8-Bit EEPROM
• Guaranteed Monotonic Over-Temperature
• Compatible with applications using the 7-bit ISL45041
• Pb-free (RoHS-compliant)
• Ultra-Thin 10 Ld TDFN (3 x 3 x 0.8mm max)

Description

The ISL24211 is an 8-bit programmable current sink that can be used in conjunction with an external voltage divider to generate a voltage source (V_COM) positioned between the analog supply voltage and ground. The current sink's full-scale range is controlled by an external resistor, R_SET. With the appropriate choice of external resistors R₁ and R₂, the V_COM voltage range can be controlled between any arbitrary voltage range. The ISL24211 has an 8-bit data register and 8-bit EEPROM for storing both a volatile and a permanent value for its output, with an I²C interface to read and write to the register and EEPROM. After the part is programmed, the I²C interface is no longer needed; on power-up the EEPROM contents are automatically transferred to the data register, and the
pre-programmed output voltage appears on the VCOM_OUT pin.

The ISL24211 also features an integrated, wide-bandwidth, high output drive buffer amplifier that can directly drive the V_COM input of an LCD panel.

The ISL24211 is available in an 10 Ld 3mm x 3mm TDFN package. This package has a maximum height of 0.8mm for very low profile designs. The ambient operating temperature range is -40°C to +85°C.

Applications

• LCD Panel V_COM Generator
• Electrophoretic Display V_COM Generator