QST608 ST Microelectronics, QST608 Datasheet - Page 21
QST608
Manufacturer Part Number
QST608
Description
Capacitive touch sensor device
Manufacturer
ST Microelectronics
Datasheet
1.QST608.pdf
(44 pages)
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QST608
Note:
1
2
Key activation description
Table 8.
Key activation (Bit 7)
Key identifier (Bits 3:0)
Low power mode description
Table 9.
Device Frequency (Bit 7)
Free Run in Detect (Bit 6)
Sleep Duration Factor (Bits 5 to 0)
When the device is in Sleep or Deep Sleep, any I
The I
Low Power mode. The Master device will have to repeat the command to ensure that it is
taken in account.
Activation
Bit 7
Bit 7
Freq
Key
0: Key disabled
1: Key enabled
0000: All keys
0001: Key 1
0010: Key 2
0011: Key 3
2
C QST device address is not acknowledged but forces the QST device to exit from
0: Reduced internal frequency (default)
1: Maximum internal frequency
0: Low Power mode is always enabled, whatever the state of the keys.
1: Low Power mode is automatically suspended when any key is in Detect state.
Low Power mode is automatically resumed when no key is in Detect state.
0x00 or 0x20 to 0x3E: Low power mode is disabled.
0x01 to 0x19: Low Power mode. The sleep duration is ‘Sleep Duration Factor’ x 20
milliseconds (20 ms to 500 ms)
0x3F: Deep Sleep mode is entered immediately. Only a reset or an I
the correct device address allows exiting Deep Sleep mode.
KeyActivation
SetLowPower
Free Run
in Detect
Bit 6
Bit 6
0
Bit 5
Bit 5
0
0100: Key 4
0101: Key 5
0111: Rotor/Slider 1
Bit 4
Bit 4
0
Sleep Duration Factor
2
Bit 3
Bit 3
C bus activity will wake-up the device.
Key ID (binary coded)
Bit 2
Bit 2
Device operating mode
Bit 1
Bit 1
2
C frame with
Bit 0
Bit 0
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