STM32L011X3 datasheet(87/115 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32L011x3/4

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DocID027973 Rev 4

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) and when the I2CCLK frequency is

greater than the minimum given in Table 63. 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 62 for the analog filter

characteristics).

Table 62. I2C analog filter characteristics(1)

1. Guaranteed by design, not tested in production.

Symbol

Parameter

Min

Max

Unit

tAF

Maximum pulse width of spikes

that are suppressed by the analog

filter

50(2)

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

100(3)

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

Table 63. I2C frequency in all I2C modes

Symbol

Parameter

Condition

Min

Unit

fI2CCLK

I2C clock frequency

Standard-mode

MHz

Fast-mode

Fast-mode Plus

Analog filter ON,

DNF = 0

Analog filter OFF,

DNF = 1

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