QST104 STMicroelectronics, QST104 Datasheet - Page 23

• Manufacturer Part Number: QST104
• Description: Capacitive touch sensor device 4 keys
• Manufacturer: STMicroelectronics

QST104
Note:
1
2
Key activation description
Table 14.
Key activation (Bit 7)
Key identifier (Bits 3:0)
Low power mode description
Table 15.
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
Key
0: Key enabled
1: Key disabled
0000: All keys
0001: Key 1
0010: Key 2
0
2
C QST device address is not acknowledged but forces the QST device to exit from
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
0011: Key 3
0100: Key 4
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 modes
Bit 1
Bit 1
www.DataSheet4U.com
2
C frame with
Bit 0
Bit 0
23/45