QT1106-ISG View Datasheet(PDF) - Quantum Research Group
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QT1106-ISG Datasheet PDF : 20 Pages
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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 become
non-responsive.
Note that the device recalibrates automatically on power-up,
so that the use of Recal should rarely be required excepting
Key 7 when used as a proximity sensor, in which case this
channel should be recalibrated soon after each proximity
detection to ensure stability.
Resolution - the resolution of the wheel/slider’s reported
position. Refer to Figure 3.2.
Resolution
Bits
Resolution
765
0 0 0 Reserved
0 0 1 2 Bits : 4 positions (0...3)
0 1 0 3 Bits : 8 positions (0...7)
0 1 1 4 Bits : 16 positions (0...15)
1 0 0 5 Bits : 32 positions (0...31)
1 0 1 6 Bits : 64 positions (0...63)
1 1 0 7 Bits : 128 positions (0...127) (default)
1 1 1 8 Bits : 256 positions (0...255)
Note: a resolution change will only become effective on the
next touch.
3.5.3 Custom Threshold Command Mode
When CT=1, the three host command bytes should contain
the following bits:
Host
Bit
Byte # 7 6 5 4 3 2 1 0
1 CT=1 0 0 0 0 0 0 0
2
T1 - Wheel/Slider Threshold
3
00000000
T1: Custom threshold value of the wheel/slider. Higher
numbers are less sensitive. Touch detection uses this
threshold combined with a hysteresis equal to 12.5% of the
threshold (with a minimum hysteresis value of one).
Power-up default setting: 40
Note: Custom Threshold Command is only used if the
detection threshold of the wheel/slider needs to be changed
from the power-up default.
3.6 SPI Responses
The 3 return bytes which contain key states are as follows:
Return
Bit
byte # 7 6 5 4 3 2 1 0
1
CW CK EW EK LPS QM 0 CTL
2
W K7 K6 K5 K4 K3 K2 K1
3
Position
CTL: Custom Threshold Loaded: If CTL=1, a custom
wheel/slider threshold has been loaded from the host. If a
custom threshold is utilised, CTL can be used to indicate
if the threshold needs to be resent due to a reset of the
device.
QM: QMagic Proximity Mode: If QM=1, QMagic Proximity
mode is activated (see Section 2.6).
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. All keys will be recalibrated if this
condition is seen for six successive cycles. If QMagic
Proximity mode is active, an error on the Proximity Key
(Key 7) will only cause a recalibration on itself.
EW: Wheel/Slider in Error: If EW=1, there is a sufficient
decrease in capacitance of the wheel/slider from the
reference level. The wheel/slider will be recalibrated if
this condition is seen for six successive cycles.
CK: Key(s) in Calibration: If CK=1, one or more key(s) are
being calibrated.
CW: Wheel/Slider in Calibration: If CW=1, the wheel/slider
is being calibrated.
K1...K7: Contains the key states of each key. A ‘1’ in a bit
position means the key is confirmed as being touched.
Figure 3.2 Wheel and Slider Resolution
(see end of Section 3.5.2)
Slider Mode
Wheel Mode
SNSA
A3
2 bits
0
SNSA
A1
1
SNSA
A2
2
SNSA
A3
3
SNSA
A3
3 bits
0
SNSA
A1
1
2
3
SNSA
A2
4
5
6
SNSA
A3
7
SNSA
A3
SNSA
A1
SNSA
A2
SNSA
A3
4 bits
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Note: the first and last slider positions
(shaded) have larger touch areas.
SNSA
A3
3
0
SNSA
A2
2
1
2 bits
SNSA
A1
SNSA
A3
7
6
0
1
5
2
SNSA
A2
43
SNSA
A1
3 bits
SNSA
A3
14 15 0 1
13
2
12
3
11
4
10
5
SNSA
98 76
A2
4 bits
SNSA
A1
Lq
10
QT1106-ISG R8I.05/0906
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