Datasheet

ManualsBrandsST ManualsEmbedded Processors & ControllersMicrocontroller 32bit 256KB LQFP

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Electrical characteristics STM32L476xx

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6.3.28 Communication interfaces characteristics

C interface

characteristics

The I2C interface meets the timings requirements of the I

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 RM0351 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 V

DDIOx

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 95. I2C analog filter characteristics

(1)

1. Guaranteed by design.

Symbol ParameterMinMaxUnit

Maximum pulse width of spikes

that are suppressed by the analog

filter

(2)

2. Spikes with widths below t

AF(min)

are filtered.

260

(3)

3. Spikes with widths above t

AF(max)

are not filtered

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