AK4188EN

Overview

The AK4188EN is a 4-wire resistive touch screen controller featuring an integrated 12-bit SAR A/D converter. It supports dual touch gestures, detecting pressed locations, pressure, and dual touch center coordinates. The device operates with VDD at 2.7V–3.6V and TVDD at 1.6V–3.6V. Key specifications include a typical power consumption of 276µA at 450Hz, an internal oscillator, and a median averaging filter. It utilizes an SPI interface for communication and is housed in a 16-pin QFN package (3.0mm x 3.0mm).

Feature Summary

• Dual Touch Functions: Detects center location and distance parameters for two simultaneous touch points.
• 12-bit SAR A/D Converter: Includes sample/hold circuitry for precise position and pressure measurement.
• Low Voltage Operation: Supports VDD 2.7V–3.6V and digital I/F TVDD 1.6V–3.6V.
• Integrated Features: Includes internal oscillator, median averaging filter, and auto power down.

Applications

• Mobile phones
• Digital Still Cameras (DSC)
• Digital Video Cameras (DVC)
• Smartphones
• Portable devices

Procurement Notes

Verify the specific ordering suffix (EN or VN) against the required temperature range and package type. Confirm that the TEST pin is connected to VSS during installation, as it has an internal pull-down device. Ensure all digital input pins (CSN, SCLK, SDI) are prevented from floating to maintain proper operation.

Selection Notes

Select the AK4188EN for applications requiring dual touch gesture support on 4-wire resistive screens. Ensure the host microcontroller supports SPI Mode 0 or Mode 3 with clock frequencies up to 5MHz. Verify that the system voltage levels align with the specified VDD and TVDD ranges to guarantee correct logic level compatibility.

Part Context

The AK4188EN is part of the AK4188 family manufactured by Asahi Kasei Microdevices. It is designed specifically for resistive touch screen interfaces in portable electronics. The EN variant denotes the standard commercial/industrial temperature range version available in the 16-pin QFN package.

Replacement Considerations

The AK4188VN is a direct alternative within the same family, sharing identical electrical characteristics and package dimensions. Both variants operate within the -40°C to +85°C temperature range and utilize the same 16-pin QFN footprint.