LM8300IMT9B

Overview

The LM8300IMT9B 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 at a baud rate of 38400 bps via UART. The device operates within a voltage range of 2.7 V to 5.5 V and includes internal non-volatile memory for storing calibration data and configuration settings. It supports automatic power-down modes with standby current typically less than 2 µA, and offers on-chip touch screen current drivers eliminating the need for external hardware.

Feature Summary

• Integrated 10-bit A/D converter supporting up to 500 coordinate pairs per second
• Internal non-volatile storage for calibration points and controller configurations
• Low power standby mode with typical current draw under 2 µA at 5.5 V
• On-chip touch screen current drivers requiring no external driver hardware

Applications

• Personal Digital Assistants
• Smart Hand-Held Devices
• Point-of-Sales Terminals
• KIOSK Systems
• Pagers and Cell Phones

Procurement Notes

Verify the package type matches the required PCB footprint, as the LM8300 family is available in WQFN, PLCC, and TSSOP packages. Confirm that the specific ordering suffix corresponds to the desired pin count and thermal characteristics. Ensure the design accommodates the 48-pin TSSOP or equivalent package variant associated with this model number.

Selection Notes

Select the LM8300 when a dedicated four-wire resistive interface with low power consumption is required. The device is suitable for applications needing embedded calibration storage to remove external EEPROM dependencies. Consider the UART communication protocol requirements and ensure the host system can handle the 38400 bps data rate for coordinate transmission.

Part Context

The LM8300 is part of the LM8300/LM8500 family of four-wire resistive touchscreen controllers. While the LM8500 supports higher clock frequencies up to 10 MHz, the LM8300 is optimized for 3.3 MHz operation. Both devices share similar architectural features but differ in maximum operating frequency capabilities.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source documentation.