Datasheet

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STM32F446xC/E Electrical characteristics
175
SPI interface characteristics
Unless otherwise specified, the parameters given in Table 63 for SPI are derived from tests
performed under the ambient temperature, fPCLKx frequency and VDD supply voltage
conditions summarized in
Table 16, with the following configuration:
• Output speed is set to OSPEEDRy[1:0] = 10
• Capacitive load C=30pF
• Measurement points are done at CMOS levels: 0.5VDD
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 63. SPI dynamic characteristics
(1)
Symbol Parameter Conditions Min Typ Max Unit
f
SCK
1/t
c(SCK)
SPI clock frequency
Master full duplex/receiver mode,
2.7 V≤V
DD
≤3.6 V
SPI1/4
--
45
MHz
Master transmitter
1.71V <V
DD
< 3.6V
SPI1/4
45
Master
1.71V <V
DD
< 3.6V
SPI1/2/3/4
22.5
Slave transmitter/
full duplex mode
SPI1/4
2.7V <V
DD
< 3.6V
45
Slave receiver mode
SPI1/4
1.71V <V
DD
< 3.6V
45
Slave mode
SPI1/2/3/4
1.71V <V
DD
< 3.6V
22.5
(2)
Duty(SCK)
Duty cycle of SPI clock
frequency
Slave mode 30 50 70 %
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