LM8342SD

Specialized ICS Overview

The LM8342 is a programmable TFT VCOM calibrator integrating a non-volatile register and a DAC-controlled current sink. It features a 7-bit EEPROM for persistent storage of calibration data, accessible via an I2C compatible interface with a maximum bus speed of 400 kHz. The device operates with a digital supply (VDD) of 2.25V to 3.6V and an analog reference (AVDD) of 4.5V to 18V. The output current is adjustable in 128 steps, determined by an external resistor on the SET pin and the AVDD voltage. Packaged in a 10-WSON (3x3 mm) surface-mount case, it supports an operating temperature range of -40°C to 85°C.

Specialized ICS Feature Summary

• I2C Compatible Programmable DAC: Controls output current in 128 steps for precise VCOM tuning.
• Non-Volatile Memory: 7-bit EEPROM stores settings permanently; data copies to volatile register at power-on.
• No External Programming Voltage Required: Simplifies factory calibration by eliminating potentiometer adjustments.
• Switched SCL Input: Supports in-circuit PCB testing via the SCL-S pin.

Specialized ICS Applications

• TFT Panel Factory Calibration
• Digital Potentiometer Replacement
• Programmable Current Sink

Specialized ICS Procurement Notes

Verify the package marking and date code against the manufacturer's latest production data sheet. Confirm that the ordering suffix corresponds to the Tape & Reel packaging format. Ensure the specific revision level matches the design requirements for the I2C interface timing and electrical characteristics.

Specialized ICS Selection Notes

Select the LM8342 when electronic VCOM calibration is required to replace manual potentiometer trimming. Ensure the system AVDD voltage falls within the 4.5V to 18V range and VDD is between 2.25V and 3.6V. Calculate the RSET value based on the desired maximum output current range using the provided equations in the datasheet.

Specialized ICS Part Context

The LM8342 is part of Texas Instruments' specialized ICs for display drivers. It serves as a dedicated solution for liquid crystal display manufacturing, specifically addressing the need for stable and repeatable VCOM voltage calibration during the assembly of TFT panels.

Specialized ICS Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing I2C addresses and pin configurations if considering alternative vendors.