STSAFE-A110 datasheet(27/36 Pages) STMICROELECTRONICS

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DS13039 Rev 1

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STSAFE-A110

Electrical characteristics

5.2.5

Power consumption optimization

When the STSAFE-A110 is not in use, it is possible to decrease its power consumption by

removing the power supply properly.

This could be achieved by using a transistor to pilot the STSAFE-A110 power supply, or by

using a GPIO able to provide an ICC-PROC current that respects the STSAFE-A110 powering

conditions.

Note:

The RESET signal must remain low when power is removed.

5.3

DC characteristics

The following tables provide the detailed description of the DC operating conditions of

STSAFE-A110 from 1.62 V to 5.5 V voltages.

Note:

VCC Max is the maximum VCC as defined in Table 3: Power supply specifications.

Tset_4mA

Minimum time required to supply

4 mA

From POWER

OFF

500

From IDLE

150

tWL

Pulse width for Reset

µs

tR/tF

Reset

Reset rise and fall time

VCC > VPOR

µs

tI2C_

READY

Delay for STSAFE-A110 to accept

I²C commands after a reset

sequence.

-20

Table 4. Power-on and reset sequence timings (continued)

Name

Description

Conditions

Min.

Typ.

Max.

Units

Table 5. DC operating specifications and input parameters

Name

Description

Conditions

Min.

Max.

Units

VIH

Input high voltage

T = 25 °C

0.7 × VCC

-V

VIL

Input low voltage

T = 25 °C

0.3 × VCC

IIH

Input high current

RST

µA

SDA, SCL

−11

IIL

Input low current

RST

µA

SDA, SCL

−11

µA

VOL

Output low voltage

IOL = 1 mA

0.54

IOL

Output low current

VCC = 3.3 V and

VOL = 0.4 V

CIN1

SCL input capacitance

VIN = 0 to VCC Max

-30

CIN2

SDA input capacitance

VIN = 0 to VCC Max

-30

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