STM32L072KB datasheet(109/147 Pages) STMICROELECTRONICS

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STM32L072xx

Electrical characteristics

117

The analog spike filter is compliant with I2C timings requirements only for the following

voltage ranges:



Fast mode Plus: 2.7 V

VDD 3.6 V and voltage scaling Range 1



Fast mode:

–2 V

 VDD  3.6 V and voltage scaling Range 1 or Range 2.

–VDD < 2 V, voltage scaling Range 1 or Range 2, Cload < 200 pF.

In other ranges, the analog filter should be disabled. The digital filter can be used instead.

Note:

In Standard mode, no spike filter is required.

USART/LPUART characteristics

The parameters given in the following table are guaranteed by design.

Table 73. I2C analog filter characteristics(1)

1. Guaranteed by characterization results.

Symbol

Parameter

Conditions

Min

Max

Unit

tAF

Maximum pulse width of spikes that

are suppressed by the analog filter

Range 1

50(2)

2. Spikes with widths below tAF(min) are filtered.

100(3)

3. Spikes with widths above tAF(max) are not filtered

Range 2

Range 3

Table 74. USART/LPUART characteristics

Symbol

Parameter

Conditions

Typ

Max

Unit

tWUUSART

Wakeup time needed to

calculate the maximum

USART/LPUART baudrate

allowing to wake up from

Stop mode

Stop mode with main regulator in

Run mode, Range 2 or 3

-8.7

µs

Stop mode with main regulator in

Run mode, Range 1

-8.1

Stop mode with main regulator in

low-power mode, Range 2 or 3

-12

Stop mode with main regulator in

low-power mode, Range 1

-11.4

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