MXB7843EUE+

Overview

The MXB7843EUE+ is a standard four-wire resistive touch screen controller manufactured by Maxim Integrated, now part of Analog Devices Inc. It integrates a 12-bit sampling analog-to-digital converter (ADC) with a synchronous serial interface and low on-resistance switches for driving resistive touch screens. The device supports single-supply operation from 2.375V to 5.25V and features programmable resolution of 8 or 12 bits via SPI/QSPI interfaces. All analog inputs include ESD protection rated at ±15kV air discharge and ±8kV contact discharge per IEC 61000-4-2 standards. It operates within a temperature range of -40°C to +85°C and is housed in a 16-pin QSOP or TSSOP package.

Feature Summary

• Integrated 12-bit ADC with synchronous serial interface for high-speed touch coordinate acquisition
• Low power consumption suitable for battery-operated systems, with typical current draw of 2µA in shutdown mode
• Robust ESD protection on all analog inputs eliminating the need for external transient voltage suppressors
• Supports absolute or ratio measurements using an external reference voltage

Applications

• Personal Digital Assistants (PDAs)
• Point-of-Sale (POS) terminals
• Cellular phones and mobile devices
• Touchscreen monitors and displays
• Portable instruments

Procurement Notes

Verify component authenticity through authorized distributors as the MXB7843 series has reached end-of-life status. Confirm package type (QSOP or TSSOP) and suffix codes match design requirements. Check for obsolescence notices from Analog Devices regarding final purchase dates. Ensure supply chain sources provide valid traceability documentation for industrial applications.

Selection Notes

Select this controller for designs requiring integrated touch sensing and ADC functionality in a compact footprint. Consider the 12-bit resolution and 125ksps sampling rate for responsive touch performance. Verify compatibility with the system's microcontroller SPI interface. Evaluate power budget constraints against the device's multiple operating modes including auto-shutdown capabilities during conversion gaps.

Part Context

The MXB7843 belongs to the Maxim Integrated family of touch screen controllers designed for portable electronics. It shares pinout compatibility with the MXB7846 model, facilitating potential design upgrades or replacements within existing hardware architectures. The device represents a solution for integrating touch input processing directly into handheld devices without requiring separate touch controller ICs.

Replacement Considerations

The MXB7846 is a pin-compatible alternative within the same product family. Verify functional differences between these models before substitution. No other direct cross-references are confirmed in public documentation.