at42qt1070 ATMEL Corporation, at42qt1070 Datasheet - Page 22

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

5.11
5.12
22
Address 53: FastOutDI/Max Cal/Guard Channel
Address 54: Low Power (LP) Mode
AT42QT1070
Table 5-11.
Table 5-12.
FO: Fast Out DI – when bit 5 is set then a key filters out with an integrator of 4. Could have a DI
in of 100 but filter out with DI of 4 (global setting for all keys).
MAX CAL: if this bit is clear then all keys recalibrate after a Max On Duration timeout, otherwise
only the key with the incorrect timing gets recalibrated.
GUARD CHANNEL: bits 0 – 3 are used to set a key as the guard channel (which gets priority
filtering). Valid values are 0 – 6, with any larger value disabling the guard key feature.
LP MODE: this 8-bit value determines the number of 8 ms intervals between key
measurements. Longer intervals between measurements yield a lower power consumption but
at the expense of a slower response to touch.
Default: 2 (16 ms between key acquisitions)
Address
Address
Setting
...254
53
54
255
0
1
2
3
4
Max On/Guard Channel
LP Mode
b7
b7
2.032s
2.040s
16 ms
24 ms
32 ms
Time
8 ms
8 ms
–
b6
b6
FO
b5
b5
MAX CAL
LOW POWER MODE
b4
b4
b3
b3
GUARD CHANNEL
b2
b2
b1
b1
9596A–AT42–10/10
b0
b0