Datasheet

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STM32F765xx STM32F767xx STM32F768Ax STM32F769xx Electrical characteristics
220
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
DD
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)=0.8473xR
p
xC
load
R
p
(min)= (VDD-V
OL
(max))/I
OL
(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 I
2
C SDA and SCL I/Os embed an analog filter. Refer to Table 85 for the analog filter
characteristics:
Table 84. Minimum I2CCLK frequency in all I2C modes
Symbol Parameter Condition Min Unit
f(I2CCLK)
I2CCLK
frequency
Standard-mode - 2
MHz
Fast-mode
Analog filter ON
DNF=0
8
Analog filter OFF
DNF=1
9
Fast-mode Plus
Analog filter ON
DNF=0
16
Analog filter OFF
DNF=1
16
Table 85. I2C analog filter characteristics
(1)
1. Guaranteed by characterization results.
Symbol Parameter Min Max Unit
t
AF
Maximum pulse width of spikes that
are suppressed by the analog filter
50
(2)
2. Spikes with widths below t
AF(min)
are filtered.
70
(3)
3. Spikes with widths above t
AF(max)
are not filtered.
ns
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