Texas Instruments LDC-HALL-HMI-EVM

Overview

LDC-HALL-HMI-EVM from Texas Instruments is an evaluation module for human-machine interface (HMI) development, integrating inductive touch buttons via dual LDC3114 ICs and a contactless magnetic dial using the TMAG5273 Hall sensor. It supports four operational modes, real-time I²C data streaming, LED-based angle visualization (12-segment ring), and haptic feedback via DRV2605. Designed for rapid prototyping of non-mechanical control interfaces in industrial and consumer HMI applications.

For engineers reviewing the LDC-HALL-HMI-EVM datasheet, LDC-HALL-HMI-EVM pinout, LDC-HALL-HMI-EVM application, or LDC-HALL-HMI-EVM equivalent, this page delivers verified technical context, GUI integration details, SCB firmware management, mode-switching behavior, and hardware-software co-design considerations for inductive + Hall-based HMI validation.

Technical Context

The LDC-HALL-HMI-EVM implements a dual-sensor HMI architecture: two LDC3114 4-channel inductance-to-digital converters (TSSOP-16) monitor eight discrete inductive coil buttons with baseline tracking or raw data output, while the TMAG5273 (SOT-23-6) provides 3-axis linear Hall sensing for absolute angular position detection. All sensors communicate over shared I²C buses routed through a PCA9543A 2-channel I²C switch and level-shifted via SN74AVCH4T245.

Operation requires the Sensor Control Board (SCB), which hosts a microcontroller running TI's GUI Composer framework, enabling USB-connected configuration, real-time data plotting, firmware updates, and mode selection via mechanical press on the magnetic dial. The EVM includes on-board TCA9534 I/O expanders for LED driving and DRV2605 haptic actuation control.

Key Specifications

Availability

LDC-HALL-HMI-EVM is available at Aetrix Electronics and suitable for industrial HMI prototyping, consumer appliance interface validation, and automotive interior control design requiring stable component supply and reference-grade sensor fusion evaluation.

Supply support for LDC-HALL-HMI-EVM 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

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and connectivity technologies, with leadership in precision sensing and low-power signal chain solutions.

The LDC-HALL-HMI-EVM belongs to TI's Sensor Evaluation Module product line, designed to accelerate development of contactless, robust, and maintenance-free human-machine interfaces for harsh or sealed environments.

FAQ

What is the required host interface to operate the LDC-HALL-HMI-EVM?

The LDC-HALL-HMI-EVM requires the Texas Instruments Sensor Control Board (SCB), which connects via micro-USB to a Windows/macOS/Linux host. The SCB acts as the bridge between the EVM's I²C sensors and the LDC-HALL-HMI-GUI - no direct USB connection from host to EVM is supported. Without the SCB, the LDC-HALL-HMI-EVM cannot be powered, configured, or monitored.

How does the magnetic dial on the LDC-HALL-HMI-EVM determine rotational position?

The LDC-HALL-HMI-EVM uses the TMAG5273 3-axis Hall-effect sensor to detect the angular orientation of a diametric N42 magnet mounted on the dial. The sensor outputs raw X/Y/Z field data over I²C; firmware on the SCB computes arctangent-based angle and maps it to one of twelve discrete segments, illuminating corresponding LEDs in the top-right circular ring - no mechanical detents or optical encoders are used.

What are the differences between Operational Modes 3 and 4 on the LDC-HALL-HMI-EVM?

Operational Mode 3 configures the LDC-HALL-HMI-EVM to stream raw inductance data exclusively from the left-side set of four inductive buttons (connected to U2), while Mode 4 streams raw data only from the right-side set (connected to U4). Both modes disable the LDC3114's baseline tracking algorithm to expose unprocessed sensor output - essential for algorithm development and noise characterization.

Can the LDC-HALL-HMI-EVM function without the 3D-printed housing?

Yes - the LDC-HALL-HMI-EVM PCB operates fully functional without the 3D-printed housing, base, button surface, dial, or top cover. These mechanical components are provided for ergonomic demonstration and tactile integration but are not electrically required. All connectors, test points, and sensor interfaces remain accessible on the bare PCB for lab testing and custom enclosure integration.

Does the LDC-HALL-HMI-EVM include haptic feedback, and how is it implemented?

Yes - the LDC-HALL-HMI-EVM integrates haptic feedback using the DRV2605YZF haptic driver (DSBGA-9) and a G1040003D coin-type LRA motor. Feedback is triggered via firmware-controlled PWM signals from the SCB; the driver supports both ERM and LRA actuator types and includes smart-loop closed-loop control for consistent response across temperature and aging - activated during mode transitions or button events in GUI-configured scenarios.