STMicroelectronics STEVAL-IHI002V1

Overview

STEVAL-IHI002V1 from STMicroelectronics is a daughter demonstration board implementing S-Touch™ capacitive user interface for home appliances, built around the STMPE1208S 12-bit GPIO expander with 12-channel capacitive sensing, interfacing via I²C, and enabling replacement of mechanical keypads with a wheel, slider, and five tactile buttons.

For engineers reviewing the STEVAL-IHI002V1 datasheet, STEVAL-IHI002V1 pinout, STEVAL-IHI002V1 application, or STEVAL-IHI002V1 equivalent, this board supports rapid evaluation of touch-based UI integration into washing machine control systems, low-power capacitive sensing deployment, and I²C-based peripheral expansion in embedded appliance designs.

Technical Context

The board functions as a plug-in daughter board for the STEVAL-IHI001V1 mother board, enabling automatic detection and seamless substitution of mechanical keys. It relies on the STMPE1208S to deliver 12-bit analog input resolution and dedicated capacitive sensing channels with integrated signal conditioning.

Interface is strictly I²C-based (I2CDATA/PA6 and I2CCLK/PA7), with IRQ_N output for interrupt-driven host notification, and supports segmented LED display driving (8-digit, 8-segment common-anode) via STLED316S driver IC.

Key Specifications

Availability

STEVAL-IHI002V1 is available at Aetrix Electronics and suitable for washing machine UI modernization, home appliance HMI prototyping, and capacitive touch evaluation requiring stable component supply and legacy design continuity.

Supply support for STEVAL-IHI002V1 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, sensors, power management, and analog/mixed-signal ICs for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) series, developed specifically to accelerate adoption of S-Touch™ capacitive sensing technology in white-goods human-machine interfaces.

FAQ

Is STEVAL-IHI002V1 compatible with microcontrollers other than the one on STEVAL-IHI001V1?

Yes - it communicates via standard I²C protocol and exposes all required signals (I2CDATA, I2CCLK, IRQ_N, RESET) on its edge connector. Any I²C-capable MCU with appropriate pull-ups and voltage level compatibility (3.3 V logic) can interface directly, though firmware must implement STMPE1208S register mapping and capacitive sensor calibration.

Does the board include firmware or require external programming?

No - STEVAL-IHI002V1 is hardware-only and contains no programmable memory or embedded firmware. It relies entirely on host MCU firmware to configure the STMPE1208S registers, read capacitive sensor data, and drive the LED display via the STLED316S. Reference code is available in ST application notes AN3149 and AN3227.

Can the capacitive sensing channels be reconfigured for custom electrode layouts?

Yes - the STMPE1208S supports flexible electrode routing through its internal multiplexer and configurable thresholds. The board's PCB layout provides access to all 12 sensing inputs (PB0–PB7, PC0–PC3), allowing physical redesign of electrodes (e.g., larger sliders, proximity zones) while retaining full register-level control over sampling rate, baseline tracking, and noise filtering.

What is the role of the L5970D DC-DC converter on this board?

The L5970D (U4) is a step-down switching regulator providing a stable 5 V output from the 5–30 V input range. It powers the STLED316S display driver and digital logic sections, ensuring consistent LED brightness and I²C signal integrity across wide input voltage variations typical in appliance power rails.