Datasheet

DocID026289 Rev 6 105/149
STM32F411xC STM32F411xE Electrical characteristics
123
Table 58. I
2
C characteristics
Symbol Parameter
Standard mode
I
2
C
(1)(2)
1.
Guaranteed by design.
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 0 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.
0900
(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
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 fast
mode
050
(5)
5. The minimum width of the spikes filtered by the analog filter is above t
SP
(max)
050
(5)
ns
C
b
Capacitive load for each bus
line
- 400 - 400 pF
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