STM32F328C8 datasheet(82/109 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F328C8

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DocID026351 Rev 3

6.3.17

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

configured (refer to 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 VDD 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/O characteristics.

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

filter characteristics:

Table 54. 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 width below tAF(min.) are filtered.

260(3)

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

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