STWBC datasheet(18/36 Pages) STMICROELECTRONICS

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Electrical characteristics

STWBC

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DocID027322 Rev 3

5.3.1

VOUT external capacitor

The stabilization of the main regulator is achieved by connecting an external capacitor

CVOUT(b) to the VOUT pin. The CVOUT is specified in Section 5.3: Operating conditions.

Care should be taken to limit the series inductance to less than 15 nH.

Figure 7. External capacitor CVOUT

5.3.2

Internal clock sources and timing characteristics

HSI RC oscillator

The HSI RC oscillator parameters are specified under general operating conditions for VDD

and TA.

b. ESR is the equivalent series resistance and ESL is the equivalent inductance.

Table 7. HSI RC oscillator

Symbol

Parameter

Conditions

Min.(1)

1. Data based on characterization results, not tested in production.

Typ.

Max.(1) Unit

fHSI

Frequency

MHz

ACCHSI

Accuracy of HSI oscillator

(factory calibrated)(1), (2)

2. Variation referred to fHSI nominal value.

VDD = 3.3 V

TA= 25 ºC

-1%

+1%

VDD = 3.3 V

-40 ºC

 TA  105 ºC

-4%

+4%

VDD = 5 V

-40 ºC

 TA  105 ºC

-4%

+4%

tSU(HSI)

HSI oscillator wakeup time

including calibration

1µs

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