at42qt2160 ATMEL Corporation, at42qt2160 Datasheet - Page 25

• Manufacturer Part Number: at42qt2160
• Description: Qslide?, 16-key Qmatrix? Sensor Ic
• Manufacturer: ATMEL Corporation

7.4
7.5
9502A–AT42–07/08
Address 2: General Status
Address 3...4: Key Status
Table 7-4.
Table 7-5.
These bits indicate the general status of the device. A change in this byte will cause the
CHANGE line to trigger.
RESET: this bit is set after a reset. This bit is clear after this byte is read back by the host.
CYCLE OVERRUN: this bit is set if the cycle time is more than 16ms. It will be cleared when the
cycle time is less than 16ms.
Note: holding any of the
increase the cycle time.
CC: this common change bit is set if all the selected keys (address 78...79) have a signal
change of more than half the detection threshold, NTHR. The CC bit is not debounced.
This bit can be used to indicate a common change in signals, e.g. In a notebook application,
where the cover is closing, so that the host can suppress key detections.
Note: the CC bit will be set to 1 if no keys are selected to be in the Common Change group (see
Section 7.27 on page
SDET: this bit is set if a touch is detected on the slider.
Address 3: detect status for keys 0 to 7
Address 4: detect status for keys 8 to 15
Each location indicates all keys in detection, if any, as a bitfield; touched keys report as “1”,
untouched or disabled keys report as “0”. A change in this byte will cause the CHANGE line to
trigger.
Address
Address
2
3
4
General Status
Key Status and Numbering
RESET
k15
b7
b7
k7
35).
CYCLE
OVER
I
RUN
2
k14
b6
b6
C
k6
-compatible lines, for clock stretching or other purposes, will
k13
b5
b5
k5
0
k12
b4
b4
k4
0
k11
b3
b3
k3
0
k10
b2
b2
k2
0
AT42QT2160
CC
b1
b1
k1
k9
SDET
b0
b0
k0
k8
25