at42qt1070 ATMEL Corporation, at42qt1070 Datasheet - Page 35

• Manufacturer Part Number: at42qt1070
• Description: Qtouch 7-channel Sensor Ic
• Manufacturer: ATMEL Corporation

9596A–AT42–10/10
3
4
5
6
Wiring and Parts ..................................................................................... 13
I2C-compatible Communications (Comms Mode Only) ...................... 15
Setups ...................................................................................................... 18
Specifications.......................................................................................... 24
3.1
3.2
3.3
3.4
4.1
4.2
4.3
4.4
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
5.11
5.12
5.13
5.14
5.15
6.1
6.2
6.3
6.4
Rs Resistors .....................................................................................................13
LED Traces and Other Switching Signals ........................................................13
PCB Cleanliness...............................................................................................14
Power Supply ...................................................................................................14
I2C-compatible Protocol ...................................................................................15
I2C-compatible Address ...................................................................................15
Data Read/Write ...............................................................................................15
SDA, SCL .........................................................................................................17
Introduction.......................................................................................................18
Address 0: Chip ID ...........................................................................................19
Address 1: Firmware Version ...........................................................................19
Address 2: Detection Status .............................................................................20
Address 3: Key Status ......................................................................................20
Address 4 – 17: Key Signal ..............................................................................20
Address 18 – 31: Reference Data ....................................................................20
Address 32 – 38: Negative Threshold (NTHR).................................................21
Address 39 – 45: Averaging Factor/Adjacent Key Suppression (AVE/AKS) ....21
Address 46 – 52: Detection Integrator (DI).......................................................21
Address 53: FastOutDI/Max Cal/Guard Channel .............................................22
Address 54: Low Power (LP) Mode..................................................................22
Address 55: Max On Duration ..........................................................................23
Address 56: Calibrate .......................................................................................23
Address 57: RESET .........................................................................................23
Absolute Maximum Specifications....................................................................24
Recommended Operating Conditions ..............................................................24
DC Specifications .............................................................................................24
Power Consumption Measurements ................................................................25
4.1.1
4.1.2
4.3.1
4.3.2
Protocol........................................................................................15
Signals .........................................................................................15
Writing Data to the Device ...........................................................15
Reading Data From the Device ...................................................16
AT42QT1070
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