Datasheet

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STM32F446xC/E Electrical characteristics
175
The I
2
C characteristics are described in Table 61. Refer also to Section 6.3.17: I/O port
characteristics
for more details on the input/output alternate function characteristics (SDA
and SCL)
.
Table 61. I
2
C characteristics
Symbol Parameter
Standard mode
I
2
C
(1)(2)
1.
Guaranteed based on test during characterization.
Fast mode I
2
C
(1)(2)
2. f
PCLK1
must be at least 2 MHz to achieve standard mode I
2
C frequencies. It must be at least 4 MHz to
achieve fast mode I
2
C frequencies, and a multiple of 10 MHz to reach the 400 kHz maximum I
2
C fast mode
clock.
Unit
Min Max Min Max
t
w(SCLL)
SCL clock low time 4.7 - 1.3 -
µs
t
w(SCLH)
SCL clock high time 4.0 - 0.6 -
t
su(SDA)
SDA setup time 250 - 100 -
ns
t
h(SDA)
SDA data hold time - 3450
(3)
3. The device must internally provide a hold time of at least 300 ns for the SDA signal in order to bridge the
undefined region of the falling edge of SCL.
-900
(4)
4. The maximum data hold time has only to be met if the interface does not stretch the low period of SCL
signal.
t
v(SDA, ACK)
Data, ACK valid time - 3.45 - 0.9
t
r(SDA)
t
r(SCL)
SDA and SCL rise time - 1000 - 300
t
f(SDA)
t
f(SCL)
SDA and SCL fall time - 300 - 300
t
h(STA)
Start condition hold time 4.0 - 0.6 -
µs
t
su(STA)
Repeated Start condition
setup time
4.7 - 0.6 -
t
su(STO)
Stop condition setup time 4.0 - 0.6 - µs
t
w(STO:STA)
Stop to Start condition time
(bus free)
4.7 - 1.3 - µs
t
SP
Pulse width of the spikes
that are suppressed by the
analog filter for standard and
fast mode
- - 0.05 0.09
(5)
5. The minimum width of the spikes filtered by the analog filter is above t
SP
(max).
µs
C
b
Capacitive load for each bus
line
- 400 - 400 pF
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