STM32L031C6 datasheet(91/126 Pages) STMICROELECTRONICS

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DS10668 Rev 6

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STM32L031x4/6

Electrical characteristics

6.3.19

Communications interfaces

I2C interface characteristics

The I2C interface meets the timings requirements of the I2C-bus specification and user

manual rev. 03 for:

•

Standard-mode (Sm) : with a bit rate up to 100 kbit/s

•

Fast-mode (Fm) : with a bit rate up to 400 kbit/s

•

Fast-mode Plus (Fm+) : with a bit rate up to 1 Mbit/s.

The I2C timing requirements are guaranteed by design when the I2C peripheral is properly

configured (refer to the reference manual for details). The SDA and SCL I/O requirements

are met with the following restrictions: the SDA and SCL I/O pins are not "true" open-drain.

When configured as open-drain, the PMOS connected between the I/O pin and VDDIOx is

disabled, but is still present. Only FTf I/O pins support Fm+ low level output current

maximum requirement (refer to Section 6.3.13: I/O port characteristics for the I2C I/Os

characteristics).

All I2C SDA and SCL I/Os embed an analog filter (see Table 65 for the analog filter

characteristics).

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 must be disabled. The digital filter can be used instead.

Note:

In Standard mode, no spike filter is required.

tCOUNTER

16-bit counter clock

period when internal clock

is selected (timer’s

prescaler disabled)

65536

tTIMxCLK

fTIMxCLK = 32 MHz 0.0312

2048

µs

tMAX_COUNT Maximum possible count

65536 × 65536

tTIMxCLK

fTIMxCLK = 32 MHz

134.2

1. TIMx is used as a general term to refer to the TIM2, TIM21, and TIM22 timers.

Table 64. TIMx(1) characteristics (continued)

Symbol

Parameter

Conditions

Min

Max

Unit

Table 65. 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)

Range 2

Range 3

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