Datasheet

DocID027100 Rev 4 111/149
STM32L072xx Electrical characteristics
120
The analog spike filter is compliant with
I
2
C timings requirements only for the following
voltage ranges:
• Fast mode Plus: 2.7 V ≤
V
DD
≤ 3.6 V and voltage scaling Range 1
• Fast mode:
–2 V ≤ V
DD
≤ 3.6 V and voltage scaling Range 1 or Range 2.
–V
DD
< 2 V, voltage scaling Range 1 or Range 2, C
load
< 200 pF.
In other ranges, the analog filter should be disabled. The digital filter can be used instead.
Note: In Standard mode, no spike filter is required.
SPI characteristics
Unless otherwise specified, the parameters given in the following tables are derived from
tests performed under ambient temperature, f
PCLKx
frequency and V
DD
supply voltage
conditions summarized in Table 26.
Refer to Section 6.3.12: I/O current injection characteristics for more details on the
input/output alternate function characteristics (NSS, SCK, MOSI, MISO).
Table 73. I2C analog filter characteristics
(1)
1. Guaranteed by characterization results.
Symbol Parameter Conditions Min Max Unit
t
AF
Maximum pulse width of spikes that
are suppressed by the analog filter
Range 1
50
(2)
2. Spikes with widths below t
AF(min)
are filtered.
260
(3)
3. Spikes with widths above t
AF(max)
are not filtered
nsRange 2 -
Range 3 -
Table 74. SPI characteristics in voltage Range 1
(1)
Symbol Parameter Conditions Min Typ Max Unit
f
SCK
1/t
c(SCK)
SPI clock frequency
Master mode
--
16
MHz
Slave mode
receiver
16
Slave mode
Transmitter
1.71<V
DD
<3.6V
--12
(2)
Slave mode
Transmitter
2.7<V
DD
<3.6V
--16
(2)
Duty
(SCK)
Duty cycle of SPI clock
frequency
Slave mode 30 50 70 %
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