Reference design guide for a touch‑metal button with integrated haptic feedback using TI components.
This reference design shows how to replace a mechanical button with a high‑resolution inductive metal‑touch solution that includes built‑in haptic feedback. The system uses the LDC1614 inductance‑to‑digital converter, DRV2605L or DRV2667 haptic drivers, an HDC1000 temperature/humidity sensor, and an MSP430F5528 MCU, all powered from a USB 5 V source.
The design is housed in an aluminum enclosure (12.5 cm × 5.5 cm × 1.5 cm) with four button locations, and it provides EMI protection, environmental compensation, and support for operation with gloves, underwater, or in harsh conditions. This manual is written in Chinese.
| Input voltage | 5 V (USB VBUS) |
|---|---|
| Operating temperature range | –20 °C to 70 °C |
| Enclosure dimensions | 12.5 cm × 5.5 cm × 1.5 cm |
| LDC1614 peak current | 8.4 mA (peak) |
| ERM actuator peak current | 580 mA (peak) |
| LRA actuator peak current | 216 mA (peak) |
| ESD rating (IEC61000‑4‑2) | ±4 kV on enclosure |
The system is powered from the USB VBUS at a nominal 5 V.
It operates from –20 °C up to 70 °C.