Electrical specifications STMPE321
34/40 Doc ID 15791 Rev 3
10 Electrical specifications
10.1 Capacitive sensing characteristics
Table 12. DC electrical characteristics (-40 - 85 °C unless otherwise stated)
Symbol Parameter Test condition
Value
Unit
Min Typ Max
V
CC
Core supply voltage 1.65 - 1.95 V
I
hibernate
HIBERNATE current
No touch sensing
capability
-1.83.0µA
I
sleep
SLEEP current
Touch sensing active,
no touch
-2743µA
I
active
ACTIVE current 100% touch activity - 280 470 µA
V
IL
Input voltage low state V
CC
=1.8 V -0.3V - 0.2V
CC
V
V
IH
Input voltage high state V
CC
=1.8 V 0.8Vcc - V
CC
+0.3V V
V
OL
Output voltage low state
V
CC
=1.8 V,
I
OUT
=4mA
-0.3V - 0.25V
CC
V
V
OH
Output voltage high
state
V
CC
=1.8
OUT
V,
I
OUT
=4mA
0.75Vcc - V
CC
+0.3V V
V
OL
(I
2
C)
Output voltage low state I
OL
=4 mA -0.3V - 0.25V
CC
V
I
leakage
Input leakage (GPIO)
GPIO as input,
V
IN
= 2.0 V
--0.5µA
Input leakage
(SCL, SDA, RST)
V
IN
= V
CC
= 1.95 V - - 0.5 µA
Table 13. Capacitive sensing characteristics
Symbol Parameter Test condition
Value
Unit
Min Typ Max
Res
Capacitive
measurement
resolution
Aref = not connected - 40 - fF
DR Dynamic range Aref = not connected - 5.1 - pF
L Linearity of sensor
Aref = not connected
Maximum deviation
calculated from full scale
capacitance
measurement data
-10 -%
