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QST108AB0 Datasheet(PDF) 23 Page - STMicroelectronics

Part # QST108AB0
Description  Capacitive touch sensor device 8 keys with individual key state outputs or I2C interface
PDF  51 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

QST108AB0 Datasheet(HTML) 23 Page - STMicroelectronics

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QST108
Device operating modes
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Note:
1
See Section 6.6: Capacitive sensing characteristics on page 35 for default values.
2
The value is a signed character (0x80...0x7F <=> -128 ... +128).
3
The value is an unsigned number (0x01..0xFF <=> 1 ... 255).
4
Enabling or disabling keys triggers a new calibration of all enabled keys.
SET_KEY_ACTIVATION (see Note 4)
Write
0x97 KeyActivation
Checksum
Enables or disables a single key.
KeyActivation: Byte containing the key number selection and
requested state.
ErrCode: Standard Error code (see Table 11)
Read
ErrCode
SET_KEY_GROUP
Write
0x00 0x09
AKSGrpMode Key1Grp
Key2Grp ...Key8Grp
CheckSum
Defines the AKS groups for each key.
AKSGrpMode: AKS mode selection of each group (see
Table 17)
KeynGrp: AKS group selection for key n (see Table 18)
ErrCode: Standard Error code (see Table 11)
Read
ErrCode
SET_LOW_POWER_MODE
Write
0x92 LowPowerMode
Checksum
Selects standard or Low Power mode.
LowPowerMode: Configure Low Power mode (see Table 15)
ErrCode: Standard Error code (see Table 11)
Read
ErrCode
SET_MAX_ON_DURATION
Write
0x8A MaxOnDuration
Checksum
Sets the maximum detected ON time before triggering an
automatic recalibration.
MaxOnDuration: Time, in second (0 for infinite)
ErrCode: Standard Error code (see Table 11)
Read
ErrCode
SET_SCKEY_PARAMETERS
Write
0x01 0x04 0x00 DeTh
EofDeTh PosRecalTh
Checksum
Sets the Detection, End Of Detection and Positive
Recalibration Thresholds for a single key.
DeTh: Detection Threshold 1) 2)
EofDeTh: End of Detection Threshold 1) 2)
PosRecalTh: Positive Recalibration Threshold 1) 2)
ErrCode: Standard Error code (see Table 11)
Read
ErrCode
Table 10.
Supported commands (continued)
I2C commands
Description



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