at42qt2100 ATMEL Corporation, at42qt2100 Datasheet - Page 24

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

Figure 5-1.
5.2.3
24
AT42QT2100
QT2100 Data
Slider and Wheel Resolution
2 bits
3 bits
4 bits
SNSKA
SNSKA
SNSKA
SNSA3
SNSA3
SNSA3
Note: the first and last slider positions
(shaded) have larger touch areas.
0
0
0
1
The three return bytes contain the response to the previously sent command. Initially it is
assumed that the previously sent command was a “Normal Exchange” command. The return
bytes for the “Normal Exchange” command is shown in
Table 5-7.
Byte 0
2
1
QT2100
3
Byte
CTL: Custom Threshold Loaded: If CTL = 1, a custom slider/wheel threshold has been
loaded from the host. This is set as a result of a “Custom Threshold” command. Once the
QT2100 has received a custom threshold, this bit is set and stays set until reset.
PM: Proximity Mode: This setting is disabled as there is no proximity mode on the
QT2100 because each key can be configured as a proximity sensor. This setting has been
left to ensure compatibility with the QT1106.
LPS: LP/Sleep State: If LPS = 1, the device was in LP, Sync, or Sleep mode when the
requesting command was received. If LPS = 0, the device was in Free Run mode.
EK: Key(s) in Error: If EK = 1, there is a sufficient decrease in capacitance of one or more
normal key(s) from the reference level. The affected key will be recalibrated if this condition
is seen for more than 1.5 seconds.
SNSKA
SNSKA
SNSKA
SNSA1
SNSA1
SNSA1
0
1
2
4
2
Slider Mode
5 6 7
1
3
CW
8
“Normal Exchange” Mode – Return Bytes
W
7
4
9 10 11 12 13 14 15
SNSKA
SNSA2
SNSKA
SNSA2
SNSKA
SNSA2
2
5
CK
K7
6
6
3
7
SNSKA
SNSA3
SNSKA
SNSA3
SNSKA
SNSA3
EW
K6
5
SNSKA
SNSA2
6
5
EK
K5
4
SNSKA
SNSA3
7
4
3 bits
Position
Bit
0
3
SNSKA
SNSA2
2
1
LPS
Table
K4
SNSKA
SNSA1
3
Wheel Mode
3
2
SNSKA
SNSA3
5-7.
2 bits
PM
K3
0
1
2
SNSKA
SNSA2
SNSKA
SNSA1
12
11
13
10
14 15
9
K2
SNSKA
SNSA3
4 bits
1
0
8
9554CX–AT42–11/11
0 1
7
6
5
2
3
4
SNSKA
SNSA1
CTL
K1
0