STM32H757AI datasheet(212/251 Pages) STMICROELECTRONICS

212 / 251 page

Electrical characteristics

STM32H757xI

212/251

DS12931 Rev 1

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 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 6.3.18: 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 fil-

ter characteristics:

USART interface characteristics

Unless otherwise specified, the parameters given in Table 119 for USART are derived from

tests performed under the ambient temperature, fPCLKx frequency and VDD supply voltage

conditions summarized in Table 23: General operating conditions, with the following

configuration:

•

Output speed is set to OSPEEDRy[1:0] = 10

•

Capacitive load CL = 30 pF

•

Measurement points are done at CMOS levels: 0.5VDD

•

IO Compensation cell activated.

•

VOS level set to VOS1

Table 117. Minimum i2c_ker_ck frequency in all I2C modes

Symbol

Parameter

Condition

Min

Unit

f(I2CCLK)

I2CCLK

frequency

Standard-mode

MHz

Fast-mode

Analog Filtre ON

DNF=0

Analog Filtre OFF

DNF=1

Fast-mode Plus

Analog Filtre ON

DNF=0

Analog Filtre OFF

DNF=1

Table 118. I2C analog filter characteristics(1)

1. Guaranteed by characterization results.

Symbol

Parameter

Min

Max

Unit

tAF

Maximum pulse width of spikes

that are suppressed by analog

filter

50(2)

2. Spikes with widths below tAF(min) are filtered.

80(3)

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

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