Datasheet

Electrical characteristics STM32F302x6 STM32F302x8
94/138 DocID025147 Rev 7
6.3.17 Communications interfaces
I
2
C interface characteristics
The I2C interface meets the timings requirements of the I
2
C-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 VDDIOx is disabled, but is still present. Only FTf I/O pins
support Fm+ low level output current maximum requirement. Refer to
Section 6.3.14: 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 60. I2C analog filter characteristics
(1)
1. Guaranteed by design.
Symbol Parameter Min Max Unit
t
AF
Maximum pulse width of spikes that
are suppressed by the analog filter
50
(2)
2. Spikes with widths below t
AF(min)
are filtered.
260
(3)
3. Spikes with widths above t
AF(max)
are not filtered
ns
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