STM32H753II datasheet(189/361 Pages) STMICROELECTRONICS

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DS12117 Rev 8

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STM32H753xI

Electrical characteristics (rev Y)

318

6.3.32

Communications interfaces

I2C interface characteristics

The I2C interface meets the timings requirements of the I2C-bus specification and user

manual revision 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 1Mbit/s.

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

configured (refer to RM0433 reference manual) and when the i2c_ker_ck frequency is

greater than the minimum shown in the table below:

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 still present.

•

The 20 mA output drive requirement in Fast-mode Plus is not supported. This limits the

maximum load Cload supported in Fm+, which is given by these formulas:

tr(SDA/SCL)=0.8473xRpxCload

Rp(min)= (VDD-VOL(max))/IOL(max)

Where Rp is the I2C lines pull-up. Refer to Section 6.3.15: I/O port characteristics for

the I2C I/Os characteristics.

All I2C SDA and SCL I/Os embed an analog filter. Refer to Table 104 for the analog filter

characteristics:

Table 103. Minimum i2c_ker_ck frequency in all I2C modes

Symbol

Parameter

Condition

Min

Unit

f(I2CCLK)

I2CCLK

frequency

Standard-mode

MHz

Fast-mode

Analog filter ON

DNF=0

Analog filter OFF

DNF=1

Fast-mode Plus

Analog filter ON

DNF=0

Analog filter OFF

DNF=1

Table 104. I2C analog filter characteristics(1)

1. Guaranteed by design.

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.

260(3)

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

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