STM32L433CB datasheet(181/225 Pages) STMICROELECTRONICS

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DS11449 Rev 5

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STM32L433xx

Electrical characteristics

193

6.3.27

Communication interfaces characteristics

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 timings requirements are guaranteed by design when the I2C peripheral is properly

configured (refer to RM0394 reference manual).

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 FT_f I/O pins

support Fm+ low level output current maximum requirement. Refer to Section 6.3.14: I/O

port characteristics for the I2C I/Os characteristics.

All I2C SDA and SCL I/Os embed an analog filter. Refer to the table below for the analog

filter characteristics:

Table 93. WWDG min/max timeout value at 80 MHz (PCLK)

Prescaler

WDGTB

Min timeout value

Max timeout value

Unit

0.0512

3.2768

0.1024

6.5536

0.2048

13.1072

0.4096

26.2144

Table 94. I2C analog filter characteristics(1)

1. Guaranteed by design.

Symbol

ParameterMin

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.

260(3)

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

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