The QT240 charge-transfer (“QT’”) QTouch IC is a self-contained digital sensor IC capable of detecting near-proximity or touch on 4 electrodes. It allows electrodes to project independent sense fields through any dielectric like glass, plastic, stone, ceramic, and wood. It can also turn metal-bearing objects into intrinsic sensors, making them responsive to proximity or touch. This capability coupled with its continuous self-calibration feature can lead to entirely new product concepts, adding high value to product designs.
The QT240 is a 4‑key charge‑transfer (QT) sensor IC designed for human‑interface applications such as appliance controls, gaming devices, and touch panels. It integrates all hardware and signal‑processing functions needed for stable touch detection, offering independent channels, auto‑calibration, and spread‑spectrum operation.
The device operates from a single 3.9 V to 5.5 V supply, supports low‑power (≈90 µA) and fast (≈1.5 mA) modes, and provides configurable options for sync, timeout, and toggle functions via external resistors.
| Supply Voltage | 3.9 V to 5.5 V |
|---|---|
| Threshold Level | 12 counts |
| Hysteresis | 2 counts (17 %) |
| Package | 20‑SSOP, Pb‑free |
| Operating Temperature | -40 °C to +85 °C |
The QT240 operates from 3.9 V up to 5.5 V.
It provides four completely independent sensing channels.