ADS7843E/2K5

Overview

The ADS7843E/2K5 is a resistive touch screen controller manufactured by Texas Instruments, belonging to the ADS7843 series. It integrates a 12-bit analog-to-digital converter (ADC) with a serial interface compatible with standard SPI protocols. The device supports 4-wire and 8-wire resistive touch screens, offering a sampling rate of 125 kS/s. It operates within a supply voltage range of 2.7 V to 5.5 V and draws a typical operating current of 280 µA. Housed in a 16-SSOP package, it functions across an industrial temperature range of -40°C to +85°C.

Feature Summary

• 12-bit resolution ADC with 125 kS/s sampling rate for precise coordinate detection
• Serial interface compatible with SPI, Microwire, and QSPI standards
• Supports 4-wire and 8-wire resistive touch screen configurations
• Low power consumption with 280 µA operating current and shutdown mode

Applications

• Industrial human-machine interfaces (HMIs)
• Medical equipment requiring resistive touch input
• Portable consumer electronics with low-power constraints

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and moisture sensitivity level (MSL) ratings prior to assembly. Check for recent product change notifications (PCN) regarding manufacturing site changes or specification updates. Ensure storage conditions adhere to humidity sensitivity guidelines to prevent package damage during soldering processes.

Selection Notes

Select this model when a 12-bit resolution and high-speed sampling are required for resistive touch applications. Compare against the ADS7846 if 4-wire specific optimization is needed, or the ADS7845 for 5-wire support. Verify that the system voltage aligns with the 2.7 V to 5.5 V operating range. Consider the 16-SSOP package dimensions for PCB layout compatibility.

Part Context

The ADS7843E/2K5 is part of the ADS784x family of touch screen controllers from Texas Instruments. This series provides integrated solutions for converting analog touch coordinates into digital data via serial interfaces. The 'E' suffix typically denotes an extended temperature range variant, while '/2K5' indicates a reel packaging quantity of 2,500 units.

Replacement Considerations

ADS7846E/2K5: Similar 12-bit controller but optimized for 4-wire screens; verify interface compatibility. ADS7845E: Supports 5-wire touch screens; check pinout differences.