AT42QT2120 Datasheet
Table Of Contents
- Features
- 1. Pinouts and Schematics
- 2. Overview
- 3. Wiring and Parts
- 4. I2C-compatible Communications (Comms Mode Only)
- 5. Setups
- 5.1 Introduction
- 5.2 Address 0: Chip ID
- 5.3 Address 1: Firmware Version
- 5.4 Address 2: Detection Status
- 5.5 Addresses 3 – 4: Key Status
- 5.6 Address 5: Slider Position
- 5.7 Address 6: Calibrate
- 5.8 Address 7: Reset
- 5.9 Address 8: Low Power (LP) Mode
- 5.10 Address 9 – 10: Toward Touch and Away from Touch Drift (TTD, ATD)
- 5.11 Address 11: Detection Integrator (DI)
- 5.12 Address 12: Touch Recal Delay (TRD)
- 5.13 Address 13: Drift Hold Time (DHT)
- 5.14 Address 14: Slider Options
- 5.15 Address 15: Charge Time
- 5.16 Address 16 – 27: Detect Threshold (DTHR)
- 5.17 Addresses 28 – 39: Key Control
- 5.18 Addresses 40 – 51: Pulse/Scale for Keys
- 5.19 Address 52 – 75: Key Signal
- 5.20 Address 76 – 99: Reference Data
- 6. Specifications
- Appendix A. I2C-compatible Operation
- Associated Documents
- Revision History
40
9634E–AT42–06/12
AT42QT2120
6.8 Part Number
The part number comprises:
AT = Atmel
42 = Touch Business Unit
QT = Charge-transfer technology
2120 = (2) capable of slider/wheel, (12) number of channels, (0) variant number
SU = SOIC chip
XU = TSSOP chip
MMH = VQFN chip
R = Tape and reel
6.9 Moisture Sensitivity Level (MSL)
Part Number Order Code Description
AT42QT2120-SU
AT42QT2120-SUR
QS589 20-pin 0.300 inch wide body, SOIC RoHS-compliant IC
AT42QT2120-XU
AT42QT2120-XUR
QS589 20-pin 4.4 mm body, TSSOP RoHS-compliant IC
AT42QT2120-MMH
AT42QT2120-MMHR
QS589 20-pad 3 × 3 × 0.85 mm body VQFN RoHS-compliant IC
MSL Rating Peak Body Temperature Specifications
MSL3 260
o
C IPC/JEDEC J-STD-020