STM32L072CB datasheet(113/160 Pages) STMICROELECTRONICS

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DS10689 Rev 5

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STM32L072xx

Electrical characteristics

122

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.

SPI characteristics

Unless otherwise specified, the parameters given in the following tables are derived from

tests performed under ambient temperature, fPCLKx frequency and VDD supply voltage

conditions summarized in Table 26.

Refer to Section 6.3.12: I/O current injection characteristics for more details on the

input/output alternate function characteristics (NSS, SCK, MOSI, MISO).

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. SPI characteristics in voltage Range 1 (1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fSCK

1/tc(SCK)

SPI clock frequency

Master mode

MHz

Slave mode

receiver

Slave mode

Transmitter

1.71<VDD<3.6V

12(2)

Slave mode

Transmitter

2.7<VDD<3.6V

16(2)

Duty(SCK)

Duty cycle of SPI clock

frequency

Slave mode

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