QT60168, QT60248 16, 24 KEY QMATRIX™ ICs are digital charge-transfer (“QT”) QMatrix™ ICs designed to detect human touch on up to 16 or 24 keys when used with a scanned, passive X-Y matrix.
The Quantum QProx QT60168 and QT60248 are digital charge‑transfer QMatrix™ ICs that detect human touch on up to 16 or 24 keys in a passive X‑Y matrix. The devices use an SPI interface, require only a few passive components, and support adaptive auto‑calibration, drift compensation and FMEA diagnostics for robust operation in harsh environments.
The manual provides detailed hardware guidelines, key‑enabling procedures, timing specifications, power‑supply recommendations and programming commands. It also includes PCB layout advice, sample capacitor and resistor values, and guidance for achieving reliable touch detection through various dielectric materials.
| Maximum keys per device | 16 (QT60168) or 24 (QT60248) |
|---|---|
| Supply voltage | +3 V to +5 V |
| Package | 32‑pin lead‑free TQFP |
| Interface | SPI slave interface |
| Typical sample resistor value | 470 kΩ |
| Typical sample capacitor value | 4.7 nF |
The QT60248 can detect up to 24 touch keys in a passive X‑Y matrix.
The device operates from a single supply of +3 V to +5 V.
Key data is transferred over an SPI slave interface using simple single‑byte commands.
A sample resistor of 470 kΩ is a reasonable default for most applications.