Datasheet

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STM32F427xx STM32F429xx Electrical characteristics
198
SPI interface characteristics
Unless otherwise specified, the parameters given in Table 62 for the SPI interface are
derived from tests performed under the ambient temperature, f
PCLKx
frequency and V
DD
supply voltage conditions summarized in Table 17, with the following configuration:
• Output speed is set to OSPEEDRy[1:0] = 10
• Capacitive load C = 30 pF
• Measurement points are done at CMOS levels: 0.5V
DD
Refer to Section 6.3.17: I/O port characteristics for more details on the input/output alternate
function characteristics (NSS, SCK, MOSI, MISO for SPI).
Table 61. I2C analog filter characteristics
(1)
1. Guaranteed by design.
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.
260
(3)
3. Spikes with widths above t
AF(max)
are not filtered
ns
Table 62. SPI dynamic characteristics
(1)
Symbol Parameter Conditions Min Typ Max Unit
f
SCK
1/t
c(SCK)
SPI clock frequency
Master mode, SPI1/4/5/6,
2.7 V≤V
DD
≤3.6 V
--
45
MHz
Slave mode,
SPI1/4/5/6,
2.7 V≤V
DD
≤3.6 V
Receiver 45
Transmitter/
full-duplex
38
(2)
Master mode, SPI1/2/3/4/5/6,
1.7 V≤V
DD
≤3.6 V
--
22.5
Slave mode, SPI1/2/3/4/5/6,
1.7 V≤V
DD
≤3.6 V
22.5
Duty(SCK)
Duty cycle of SPI clock
frequency
Slave mode 30 50 70 %
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