STMPE321 ST Microelectronics, STMPE321 Datasheet - Page 34

• Manufacturer Part Number: STMPE321
• Description: 3-channel capacitive touch key controller
• Manufacturer: ST Microelectronics

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Electrical specifications
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10.1
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Electrical specifications
Table 12.
Capacitive sensing characteristics
Table 13.
Symbol
I
Symbol
hibernate
I
leakage
I
I
(I
V
active
V
Res
sleep
V
V
V
DR
V
2
CC
OH
L
OL
OL
IH
IL
C)
Core supply voltage
HIBERNATE current
SLEEP current
ACTIVE current
Input voltage low state
Input voltage high state V
Output voltage low state
Output voltage high
state
Output voltage low state I
Input leakage (GPIO)
Input leakage
(SCL, SDA, RST)
Capacitive
measurement
resolution
Dynamic range
Linearity of sensor
DC electrical characteristics (-40 - 85 °C unless otherwise stated)
Capacitive sensing characteristics
Parameter
Parameter
Doc ID 15791 Rev 1
No touch sensing
capability
Touch sensing active,
no touch
100% touch activity
V
V
I
V
I
GPIO as input,
V
V
Aref = not connected
Aref = not connected
Aref = not connected
Maximum deviation
calculated from full scale
capacitance
measurement data
OUT
OUT
OL
CC
CC
CC
CC
IN
IN
=4 mA
Test condition
= 2.0 V
= V
=1.8 V
=1.8 V
=1.8 V,
=1.8
= 4 mA
= 4 mA
Test condition
CC
OUT
= 1.95 V
V,
0.75Vcc
0.8Vcc
-0.3V
-0.3V
-0.3V
1.65
Min
-
-
-
-
-
Min
-
-
-
Value
Typ
280
1.8
27
Value
-
-
-
-
-
-
-
-
Typ
5.1
40
10
V
V
0.25V
0.25V
0.2V
CC
CC
Max
1.95
470
3.0
0.5
0.5
Max
43
+0.3V
+0.3V
-
-
-
STMPE321
CC
CC
CC
Unit
Unit
µA
µA
µA
µA
µA
pF
V
V
V
V
V
V
fF
%