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QST108 Datasheet(PDF) 21 Page - STMicroelectronics

Part # QST108
Description  Capacitive touch sensor device 8 keys with individual key state outputs or I2C interface
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

QST108 Datasheet(HTML) 21 Page - STMicroelectronics

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QST108
Device operating modes
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KeyError byte description
Key state (Bit 7)
When set to ‘1’, the corresponding key is touched. This bit is always cleared for the
Get_Key_State command.
Key error codes (Bits 2:0)
Key error code describes the errors in the system on all keys.
Bit 0: When set to ‘1’, calibration in progress
Bit 1: When set to ‘1’, maximum count reached
Bit 2: When set to ‘1’, minimum count not reached
All key state description
Key n state
When set to ‘1’, the corresponding key is touched.
Key activation description
Key activation (Bit 7)
0: Key enabled
1: Key disabled
Key identifier (Bits 3:0)
0000: All keys
0101: Key 5
0001: Key 1
0110: Key 6
0010: Key 2
0111: Key 7
0011: Key 3
1000: Key 8
0100: Key 4
Table 12.
KeyError byte description
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Key State
0
0
0
0
Key error codes
Table 13.
AllKeyState
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Key 8 State Key 7 State Key 6 State Key 5 State Key 4 State Key 3 State Key 2 State Key 1 State
Table 14.
KeyActivation
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Key
Activation
0
0
0
Key ID (binary coded)



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