LM8342
www.ti.com SNOSAM0B – NOVEMBER 2005 – REVISED MARCH 2013 LM8342 Programmable TFT VCOM Calibrator with Non-Volatile Memory
Check for Samples: LM8342 FEATURES DESCRIPTION 1 2 The LM8342 is an integrated combination of a nonvolatile register (7 bits EEPROM) and a DAC
controlled current source. Using the LM8342, the
VCOM calibration procedure is simplified by elimination
of the potentiometer adjustment task. This adjustment
task is currently performed at the factory using a
trimmer adjustment tool and visual inspection. 2 I C Compatible Programmable DAC to Set the
Output Current
Ensured Monotonic DAC
Non-Volatile Memory to Hold the Setting
EEPROM in System Programmable
No External Programming Voltage Required
Maximum Interface Bus Speed is 400 kHz
SON-10 Package The VCOM adjustment can be done electronically in
production, using the I2C compatible interface. The
factory operator can physically view the screen headon (frontal viewing) when performing this step, easing
manufacturing especially for large TFT panels. APPLICATIONS TFT Panel Factory Calibration
Digital Potentiometer
Programmable Current Sink The VCOM level is typically at half AVDD (determined
by R1 and R2) and is buffered by the actual VCOM
driver. By controlling the level of IOUT, the VCOM level
can be tuned. The current level at the output of the …
