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QST608AB1 Datasheet(PDF) 39 Page - STMicroelectronics

Part # QST608AB1
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

QST608AB1 Datasheet(HTML) 39 Page - STMicroelectronics

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QST108
Electrical characteristics
39/51
6.8
RESET pin
TA = -40°C to 125°C, unless otherwise specified.
Table 33.
RESET pin characteristics
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
VIL
Input low level voltage
VSS − 0.3
0.3x VDD
V
VIH
Input high level voltage
0.7 x VDD
VDD + 0.3
Vhys
Schmitt trigger voltage
hysteresis(1)
1.
Data based on characterization results, not tested in production.
2V
VOL
Output low level
voltage(2)
2.
The IIO current sunk must always respect the absolute maximum rating specified in Table 22: Current
characteristics on page 31 and the sum of IIO (I/O ports and control pins) must not exceed IVSS.
VDD = 5V IIO = +2mA
200
mV
RON
Pull-up equivalent
resistor(3)
3.
The RON pull-up equivalent resistor is based on a resistive transistor. Specified for voltages on RESET pin
between VILmax and VDD.
VIN = VSS
VDD = 5V
30
50
70
k
Ω
VDD = 3V
90(1)
tw(RSTL)out
Generated reset pulse
duration
Internal reset sources
90(1)
μs
th(RSTL)in
External reset pulse
hold time(4)
4.
To guarantee the reset of the device, a minimum pulse has to be applied to the RESET pin. All short pulses
applied on RESET pin with a duration below th(RSTL)in can be ignored.
20
μs
tg(RSTL)in Filtered glitch duration
200
ns



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