ADS7846EG4

Overview

The ADS7846EG4 is a 12-bit resolution resistive touch screen controller manufactured by Texas Instruments. It features a serial interface compatible with SPI, QSPI, and MICROWIRE protocols, supporting sampling rates up to 125 kSPS. The device operates within a supply voltage range of 2.2 V to 5.25 V and includes an internal 2.5-V reference. Key capabilities include direct battery voltage measurement (0 V to 6 V), on-chip temperature sensing, and touch pressure detection. Designed for low-power applications, it consumes less than 0.75 mW with the reference disabled at 2.7 V. The component is housed in a 16-lead SSOP package and supports industrial operating temperatures from -40°C to +85°C.

Feature Summary

• 12-bit resolution with 125 kSPS sampling rate
• Integrated 2.5-V reference and direct battery measurement capability
• Low power consumption (<0.75 mW typical)
• Serial interface compatibility (SPI/QSPI/MICROWIRE)

Applications

• Personal Digital Assistants (PDA)
• Portable instruments
• Point-of-sale terminals
• Mobile phones

Procurement Notes

Verify the specific suffix 'G4' against current manufacturer documentation to confirm lead-free status and RoHS compliance details. Check for active production status or obsolescence notices, as distribution data indicates potential end-of-life phases for certain variants. Ensure the SSOP-16 package matches the design requirements.

Selection Notes

Select this component for designs requiring a 12-bit ADC specifically optimized for resistive touch screens. It serves as a drop-in replacement for the ADS7843 with enhanced features like battery monitoring. Verify that the system clock can support the required 125 kHz conversion speed and that the 2.2 V to 5.25 V supply range aligns with the target battery or rail voltages.

Part Context

The ADS7846EG4 belongs to the ADS7846 family of touch screen controllers. It is the lead-free, RoHS-compliant version of the ADS7846E. The device maintains pin-to-pin compatibility with the industry-standard ADS7843, allowing for straightforward upgrades in existing designs without PCB layout changes.

Replacement Considerations

The ADS7846E is the non-lead-free equivalent. For automotive applications, consider the ADS7846EVM evaluation module for testing. Direct substitutes may include the ADS7843 if battery monitoring features are not required.