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STM32F769AI bảng dữ liệu(PDF) 179 Page - STMicroelectronics

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STM32F769AI bảng dữ liệu(HTML) 179 Page - 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.
ns



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