LM8300HLQ9

Overview

The LM8300HLQ9 is a four-wire resistive touchscreen controller manufactured by Texas Instruments. It features an integrated 10-bit analog-to-digital converter capable of sampling up to 500 coordinate pairs per second. Data is transmitted via a UART interface operating at 38400 bps. The device includes internal non-volatile memory for storing calibration data and configuration settings, eliminating the need for external EEPROM. It supports low-power standby modes with current consumption typically below 2 µA and incorporates brownout reset functionality.

Feature Summary

• Integrated 10-bit A/D converter providing up to 500 coordinate pairs per second
• Internal non-volatile memory for calibration points and controller configurations
• UART communication interface at 38400 bps with support for pressure measurement
• Low power standby mode with typical current draw less than 2 µA

Applications

• Personal Digital Assistants
• Smart Hand-Held Devices
• Point-of-Sales Terminals
• KIOSK Systems

Procurement Notes

Verify that the component matches the specific package type indicated by the ordering suffix. Confirm the operating temperature range aligns with system requirements. Ensure the voltage supply meets the specified limits for the LM8300 variant. Check for authenticity through authorized distribution channels to avoid counterfeit components.

Selection Notes

Select this controller for applications requiring four-wire resistive touch input without external driver hardware. Consider the internal non-volatile storage if external memory resources are limited. Evaluate the UART interface compatibility with the host processor. Verify that the operating frequency and brownout thresholds suit the power supply characteristics of the target design.

Part Context

This component belongs to the LM8300/LM8500 family of touchscreen controllers. The LM8300 variant is distinguished by its lower brownout voltage threshold compared to the LM8500. Both devices share similar functional architectures but differ in operating voltage specifications and maximum clock frequencies.

Replacement Considerations

Direct substitutes within the same family include the LM8500 series, though voltage and frequency specifications differ. Cross-family replacements require verification of pin compatibility and interface protocols. No other specific replacement part numbers are documented in the provided source material.