STLUX datasheet(86/126 Pages) STMICROELECTRONICS

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Electrical characteristics

STLUX

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DocID027870 Rev 1

12.3.1

VOUT external capacitor

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

CVOUT(c) to the VOUT pin. The CVOUT is specified in Section 12.3: Operating conditions.

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

Figure 15. External capacitor CVOUT

12.3.2

Supply current characteristics

The STLUX supply current is calculated by summing the supply base current in the desired

operating mode as per Table 72, with the peripheral supply current value reported in

Table 74 on page 90 and Table Table 75 on page 92.

For example, considering an application where:



fMASTER = fCPU = 16 MHz provided by HSI internal RC oscillator



CPU code execution in Flash



All base peripheral actives: I2C, UART, DALI, ITC, GPIO0, SysTmrWWDG and IWDG



ADC conversion frequency fADC = 5.3 MHz



ACU (comparator and DAC units) active



6 PWM toggling at fPWM = 0.5 MHz provided by 6 SMEDs running at fSMED = 12 MHz

(NPWM = 6).

Table 71. Operating conditions at power-up/power-down

Symbol

Parameter

Conditions

Min.(1)

1. Guaranteed by design, not tested in production.

Typ.

Max.(1)

Unit

tVDD

VDD rise time rate

2 µs/V

1 sec./V(2)

2. Power supply ramp must be monotone.

VDD fall time rate

2 µs/V

1 sec./V(2)

tTEMP

Reset release delay

VDD rising

VIT+

Power-on reset threshold

2.65

2.8

2.98

VIT-

Brownout reset threshold

2.58

2.73

2.88

VHYS(BOR) Brownout reset hysteresis

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

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