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QST108 数据表(PDF) 29 Page - STMicroelectronics

部件名 QST108
功能描述  Capacitive touch sensor device 8 keys with individual key state outputs or I2C interface
PDF  38 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

QST108 数据表(HTML) 29 Page - STMicroelectronics

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QST108
Electrical characteristics
29/38
6.3
Operating conditions
6.4
Supply current characteristics
Table 21.
Current characteristics
Symbol
Ratings
Maximum value
Unit
IVDD
Total current into VDD power lines (source)
(1)
1.
All power (VDD) and ground (VSS) lines must always be connected to the external supply.
75
mA
IVSS
Total current out of VSS ground lines (sink)
(1)
150
IIO
Output current sunk by RESET pin
20
Output current sunk by output pin
40
Output current source by output pin
− 25
IINJ(PIN)
(2)
(3)
2.
IINJ(PIN) must never be exceeded. This is implicitly ensured if VIN maximum is respected. If VIN maximum
cannot be respected, the injection current must be limited externally to the IINJ(PIN) value. A positive
injection is induced by VIN>VDD while a negative injection is induced by VIN<VSS. For true open-drain
pads, there is no positive injection current, and the corresponding VIN maximum must always be
respected.
3.
When several inputs are submitted to a current injection, the maximum
ΣIINJ(PIN) is the absolute sum of the
positive and negative injected currents (instantaneous values). These results are based on
characterisation with
ΣIINJ(PIN) maximum current injection on four I/O port pins of the device.
Injected current on RESET pin
± 5
Injected current output pin
± 5
ΣIINJ(PIN)(2) Total injected current (sum of all I/O and control pins)
± 20
Table 22.
Operating conditions
Symbol
Feature
Value
Unit
VDD
Operating supply voltage
2.4 to 5.5
V
TA
Operating temperature
-40° to +85°
C
Table 23.
Supply current characteristics
Symbol
Parameter
Conditions
Min.
Typ. (1)
1.
The results are based on CS = 2.7nF and CX = 12.5pF
Max.
Unit
IDD (FR)
Average suppy current
Free Run mode
VDD = 2.4 V
1.61
mA
VDD = 3.3 V
2.15
VDD = 5 V
3.15
IDD
(Sleep
100ms)
Average suppy current
100ms Sleep mode
VDD = 2.4 V
286
µA
VDD = 3.3 V
340
VDD = 5 V
497



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