The LM8342 is an integrated combination of a non-volatile register (7 bits EEPROM) and a DAC controlled current source. Using the LM8342, the V_COM 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.

The V_COM adjustment can be done electronically in production, using the I²C compatible interface. The factory operator can physically view the screen head-on (frontal viewing) when performing this step, easing manufacturing especially for large TFT panels.

The V_COM level is typically at half AV_DD (determined by R1 and R2) and is buffered by the actual V_COM driver. By controlling the level of I_OUT, the V_COM level can be tuned. The current level at the output of the LM8342 is a fraction (1/128 to 128/128) of a maximum current which is set by R_SET and an analog reference (AV_DD). The actual fraction is determined by the 7-bit DAC. As a result, the output current of the LM8342 has a good temperature stability yielding a very stable V_COM adjustment. Controlling the DAC setting of the LM8342 is done via its I²C compatible interface. The actual DAC setting is stored in a volatile register. Using a “Write to EE” command the data can be stored permanently in the embedded EEPROM. At power on of the device, the EEPROM data is copied to the volatile register, setting the DAC. At any time, the data in the EEPROM can be changed again via the I²C compatible interface.

• I2C 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

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• Display type
• LCD unipolar
• IC integration
• VCOM
• Vin (Min) (V)
• 4.5
• Vin (Max) (V)
• 18
• Source driver voltage (Min) (V)
• 4.5
• Source driver voltage (Max) (V)
• 18
• Level shifter/scan driver (ch)
• 0
• Features
• Gamma buffer, I2C interface, VCOM or op amp
• Rating
• Catalog

LM8342的完整型号有：LM8342SD/NOPB、LM8342SDX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM8342SD/NOPB，工作温度：-40 to 85，封装：WSON (DSC)-10，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM8342SD/NOPB的批量USD价格：.536（1000+）

LM8342SDX/NOPB，工作温度：-40 to 85，封装：WSON (DSC)-10，包装数量MPQ：4500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM8342SDX/NOPB的批量USD价格：.447（1000+）

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