DocID027322 Rev 3

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STWBC

Electrical characteristics

36

5.3

Operating conditions

The device must be used in operating conditions that respect the parameters in Table 5. In

addition, a full account must be taken for all physical capacitor characteristics and

tolerances.

Table 5. General operating conditions

Symbol

Parameter

Conditions

Min.

Typ.

Max. Unit

1. The external power supply can be within range from 3 V up to 5.5 V.

5.5(1)

V

3.3(1)

5(1)

Core digital power supply

2. Internal core power supply voltage.

3. Care should be taken when the capacitor is selected due to its tolerance, its dependency on temperature,

DC bias and frequency.

at 1 MHz

470

3300

nF

ESR of external capacitor(2)

0.05

0.2



ESL of external capacitor(2)

FR4 multilayer PCB

VFQFPN32

26

°C/W

Ambient temperature

Pd = 100 mW

-40

105

°C

Table 6. Operating conditions at power-up/power-down

Symbol

Parameter

Conditions

1. Guaranteed by design, not tested in production.

2. Power supply ramp must be monotone.

Unit

Reset release delay

3

ms

Power-on reset threshold

2.65

2.8

2.98

V

Brownout reset threshold

2.58

2.73

2.88