STLUX385ATR datasheet(72/99 Pages) STMICROELECTRONICS

72 / 99 page

Electrical characteristics

STLUX385A

72/98

DocID024387 Rev 2

10.3.1

VOUT external capacitor

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

CVOUT

(a)

to the VOUT pin. CVOUT is specified in the operating condition section. Care

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

Figure 12. External capacitor CVOUT

10.3.2

Supply current characteristics

The STLUX385A supply current is calculated by summing the supply base current in the

desired operating mode as per

Table 37, with the peripheral supply current value reported in

Table 39 and Table 40.

For example, considering an application where:

•

MASTER

= f

CPU

= 16 MHz provided by HSI internal RC oscillator

•

CPU code execution in Flash

•

All base peripheral actives: I

C, UART, DALI, ITC, GPIO0, SysTimr, WWDG and IWDG

•

ADC conversion frequency f

ADC

= 5.3 MHz

•

ACU (comparator and DAC units) actives

•

6 PWM toggling @ f

PWM

= 0.5 MHz provided by 6 SMEDs running @ f

SMED

= 12 MHz

PWM

= 6)

Power-on reset threshold

2.65

2.8

2.98

Brown-out reset threshold

2.58

2.73

2.88

HYS(BOR)

Brown-out reset hysteresis

Guaranteed by design, not tested in production.

Power supply ramp must be monotone

Table 36. Operating conditions at power-up/power-down (continued)

Symbol

Parameter

Conditions

Min.(1)

Typ.

Max.(1)

Unit

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

GIPD100520131002FSR

ESR

RLEAK

ESL

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