at42qt2100 ATMEL Corporation, at42qt2100 Datasheet - Page 23

• Manufacturer Part Number: at42qt2100
• Description: Qtouch Touch Sensor Ic
• Manufacturer: ATMEL Corporation

9554CX–AT42–11/11
Table 5-5.
Table 5-6.
Cal Key Num Bits
Resolution Bits
CalK – Recalibrates the key(s) specified by Cal Key Num.
CalW – Recalibrates the slider/wheel.
Set CalK/CalW only once when required, and set CalK/CalW = 0 thereafter. If the bit is
constantly set to 1, the device will keep recalibrating and will never detect a touch.
Note that the device recalibrates automatically on power-up, so that the use of Recal
should rarely be required. Any channel used as a proximity detector should be recalibrated
soon after each proximity detection, to ensure stability.
Resolution – the resolution of the slider/wheel’s reported position (see
Figure
Note: A resolution change will only become effective on the next touch.
CalK = 0: No recalibration (normal state of this bit).
CalK = 1: The device recalibrates key(s).
CalW = 0: No recalibration (normal state of this bit).
CalW = 1: The device recalibrates the slider/wheel.
011
100
101
110
111
000
001
010
011
100
101
110
111
5-1).
Key Recalibration
Resolution
Resolution
Key
Recalibrate Key 3
Recalibrate Key 4
Recalibrate Key 5
Recalibrate Key 6
Recalibrate Key 7
Reserved
2 Bits : 4 positions (0 – 3)
3 Bits : 8 positions (0 – 7)
4 Bits : 16 positions (0 – 15)
5 Bits : 32 positions (0 – 31)
6 Bits : 64 positions (0 – 63)
7 Bits : 128 positions (0 – 127) (default)
8 Bits : 256 positions (0 – 255)
AT42QT2100
Table 5-6
and
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