STM32F769AI datasheet(179/255 Pages) STMICROELECTRONICS

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STM32F765xx STM32F767xx STM32F768Ax STM32F769xx

Electrical characteristics

224

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.

•

The 20mA 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 5.3.20: I/O port characteristics for the

I2C I/Os characteristics.

All I2C SDA and SCL I/Os embed an analog filter. Refer to Table 84 for the analog filter

characteristics:

Table 84. 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 the analog filter

50(2)

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

70(3)

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

STM32F769AI 数据表(PDF) 179 Page - STMicroelectronics