STMPE321 datasheet(34/40 Pages) STMICROELECTRONICS

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Electrical specifications

STMPE321

34/40

Doc ID 15791 Rev 3

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

VCC

Core supply voltage

1.65

1.95

Ihibernate

HIBERNATE current

No touch sensing

capability

-1.8

3.0

µA

Isleep

SLEEP current

Touch sensing active,

no touch

-27

µA

Iactive

ACTIVE current

100% touch activity

280

470

µA

VIL

Input voltage low state

VCC=1.8 V

-0.3V

0.2VCC

VIH

Input voltage high state

VCC=1.8 V

0.8Vcc

VCC+0.3V

VOL

Output voltage low state

VCC=1.8 V,

IOUT=4mA

-0.3V

0.25VCC

VOH

Output voltage high

state

VCC=1.8OUTV,

IOUT =4mA

0.75Vcc

VCC+0.3V

VOL

(I2C)

Output voltage low state IOL=4 mA

-0.3V

0.25VCC

Ileakage

Input leakage (GPIO)

GPIO as input,

VIN = 2.0 V

0.5

µA

Input leakage

(SCL, SDA, RST)

VIN = VCC = 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

Dynamic range

Aref = not connected

5.1

Linearity of sensor

Aref = not connected

Maximum deviation

calculated from full scale

capacitance

measurement data

-10

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