MK712R

Overview

The MK712R is a touch screen controller IC designed for 4-wire analog resistive screens. It integrates screen drive, A/D conversion, and control circuits in a 28-pin SSOP package. The device operates on a 3.0 V to 5.5 V supply with a typical standby current of 0.5 µA. It features a 12-bit monotonic ADC, resolving coordinates at up to 197 points per second. The part supports commercial temperature ranges (0°C to +70°C) and utilizes a parallel interface for register access.

Feature Summary

• Integrated 12-bit A/D converter with ratiometric conversion capability
• Low power consumption: 0.5 µA standby current at 5.0 V
• Supports 4-wire resistive touch screens with direct drive
• Parallel interface with programmable conversion rates

Applications

• 4-wire analog resistive touch screen interfaces
• Commercial display systems requiring low standby power
• Embedded controllers needing integrated pen digitizer functionality

Procurement Notes

Verify the specific suffix configuration against the ordering table. The base model MK712R denotes the commercial temperature range (0°C to +70°C) in a 28-pin SSOP tube. Ensure compatibility with existing PCB layouts designed for IDT specifications, as Renesas acquired IDT's assets. Confirm lead times and availability status directly with authorized distributors.

Selection Notes

Select the MK712R for applications requiring a fully integrated solution for 4-wire resistive screens without external transistors. Choose this part over SOIC variants if the design requires the smaller 28-pin SSOP footprint. Verify that the system clock input can be driven within the 12 MHz to 20 MHz range, typically using a 14.3 MHz source.

Part Context

The MK712 was originally manufactured by Integrated Device Technology (IDT). Following Renesas Electronics Corporation's acquisition of IDT, the product line became part of the Renesas portfolio. The MK712R specifically refers to the commercial grade version packaged in a 28-pin Shrink Small Outline Package (SSOP).

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify pinout and register compatibility if considering alternative touch screen controllers from other manufacturers.