Renesas MK712R

Overview

MK712R from Integrated Device Technology (IDT) is a 4-wire analog resistive touch screen controller IC with integrated 12-bit ratiometric A/D converter, parallel interface, and ultra-low standby current of 0.5 µA (typical at 5.0 V). It continuously monitors touch activity, performs up to 197 points/second conversions, stores X/Y coordinates in internal registers, and asserts an interrupt signal-enabling direct integration into industrial HMI panels and automotive infotainment displays.

For engineers reviewing the MK712R datasheet, MK712R pinout, MK712R application, or MK712R equivalent, key selection considerations include its 28-pin SSOP package, 3.3 V/5 V dual-supply support, monotonic 12-bit ADC, programmable conversion rate, and compatibility with Gazelle pen digitizer register mapping for software reuse.

Technical Context

The MK712R implements a dedicated analog front-end for 4-wire resistive touch screens, applying voltage across X-plate (XH/XL) or Y-plate (YH/YL) and measuring the resulting ratiometric voltage on the orthogonal plate. Its internal timing engine synchronizes sampling with clock input (12–20 MHz), supports automatic wake-up from sub-3 µA power-down mode upon touch detection, and uses register-based control (8×8-bit registers) for configuration and data retrieval.

Operation relies on parallel bus interface (8-bit bidirectional data bus D0–D7, address lines A0–A2, RD/WR/CS controls) and discrete touch-screen drive pins (XH, XL, YH, YL, TOUCH). The IC requires no external transistors-capacitors are the only external components-and features built-in debouncing logic tied to screen decoupling time constants.

Key Specifications

Pinout & Package

Packaged in 28-pin SSOP (150 mil wide body), JEDEC MS-012AC compliant, with 0.635 mm pitch and 9.80–10.00 mm body length. Pin 1 is NC (no connect); all VDD pins must be tied to same supply rail; GND pins (10, 11, 13, 21) require low-inductance grounding.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar touch screen controller applications.

Compared with AK4183VT-EVAL and TSC2007IPW, the MK712R delivers superior integration (parallel interface, touch detection, ultra-low standby), guaranteed monotonicity, and automotive qualification - making it optimal for deterministic, low-power, single-touch HMI designs where software reuse and thermal robustness are priorities.

Availability

MK712R is available at Aetrix Electronics and suitable for automotive infotainment displays, industrial HMI panels, and medical handheld devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MK712R includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Integrated Device Technology (IDT) is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor signal conditioning solutions for communications, computing, and industrial markets.

The MK712R belongs to IDT's touch screen controller product line, designed specifically to simplify integration of 4-wire resistive touchscreens into resource-constrained embedded systems through fully integrated analog front-end, low-power operation, and register-level software compatibility.

FAQ

What is the primary function of the MK712R in a touch-enabled system?

The MK712R serves as a dedicated 4-wire analog resistive touch screen controller IC that performs real-time X/Y coordinate digitization using a 12-bit ratiometric A/D converter, manages autonomous touch detection and wake-up, stores results in internal registers, and signals completion via the INT pin. It eliminates the need for external analog circuitry or MCU-based polling loops, enabling deterministic, low-latency touch response in systems like automotive displays and industrial HMIs.

Does the MK712R support both 3.3 V and 5 V supply rails?

Yes, the MK712R operates across a supply voltage range of 3.0–5.5 V for commercial and industrial grades, and 3.135–5.5 V for automotive-grade variants (e.g., MK712RWLFTR). All VDD pins (4, 5, 22) must be connected to the same rail, and the device maintains full functionality-including 0.5 µA standby current and 197 PPS conversion rate-across both voltages without configuration changes.

How does the MK712R achieve calibration-free operation?

The MK712R uses a ratiometric A/D conversion technique where the full-scale reference is derived directly from the voltage applied across the touch screen plates. This makes coordinate values independent of absolute VDD variations, screen resistance drift, and temperature shifts. As a result, the MK712R can deliver repeatable X/Y positions without factory or runtime calibration-though parasitic interconnect resistance may reduce usable full-scale range by ~20%.

What package type is used for the MK712R, and is it RoHS-compliant?

The MK712R is packaged in a 28-pin SSOP (150 mil wide body) with 0.635 mm lead pitch, compliant with JEDEC MS-012AC. Ordering suffixes "LF" or "WLF" (e.g., MK712RWLFTR) indicate lead-free, RoHS-compliant construction. The SSOP footprint offers higher density than SOIC while maintaining hand-solderability and compatibility with standard SMT assembly processes.

Can existing Gazelle digitizer software drivers be reused with the MK712R?

Yes-the MK712R register map is explicitly designed to match the Gazelle pen digitizer, supporting identical 8×8-bit register addressing (Registers 0–7) and command sequences. This allows direct reuse of mature Gazelle driver stacks in embedded Linux, RTOS, or bare-metal firmware without modification, significantly reducing integration time and validation risk for legacy system upgrades.