The QT411 is a new type of linear capacitive touch slider sensor IC based on Quantum's patented charge-transfer methods. It can be used to create speed or volume controls, menu bars, and other more exotic forms of human interface on the panel of an appliance or personal electronic device.
This manual describes the QT411-ISSG QSlide™ touch slider IC, a linear capacitive sensor that operates from a single 2.5‑5.5 V supply and communicates via an SPI slave‑mode interface. It explains the device’s architecture, pin functions, and how it reports position as a 7‑bit value (0‑127) with typical 5 % accuracy.
The document covers wiring diagrams, PCB layout recommendations, calibration procedures, sensitivity settings, drift compensation, and power‑supply considerations. It also provides guidance on handling multiple devices, minimizing cross‑talk, and dealing with hand‑shadow effects in thicker panels.
| Supply Voltage | 2.5 V – 5.5 V single supply |
|---|---|
| Package | 14‑pin TSSOP, Pb‑free |
| Positional Accuracy | ≈ 5 % or better |
| Power Consumption | Very low power |
The DETECT pin goes high when a touch is detected and the chip is reporting an angular position; it may be left unconnected.
It spreads its acquisition bursts in a spread‑spectrum pattern, which heavily suppresses external noise and RF emissions.