STM32L552CEU6PTR datasheet(271/340 Pages) STMICROELECTRONICS

271 / 340 page

DS12737 Rev 6

271/340

STM32L552xx

Electrical characteristics

307

SPI characteristics

Unless otherwise specified, the parameters given in Table 129 for SPI are derived from tests

performed under the ambient temperature, fPCLKx frequency and supply voltage conditions

summarized in Table 27: General operating conditions.

•

Output speed is set to OSPEEDRy[1:0] = 11

•

Capacitive load C = 30 pF

•

Measurement points are done at CMOS levels: 0.5VDD

Refer to Section 5.3.15: I/O port characteristics for more details on the input/output alternate

function characteristics (NSS, SCK, MOSI, MISO for SPI).

Table 129. SPI characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max(2)

Unit

fSCK

1/tc(SCK)

SPI clock frequency

Master mode

2.7<VDD<3.6

Voltage ranges 0/1

MHz

Master mode

1.71<VDD<3.6

Voltage ranges 0/1

Master transmitter mode

1.71<VDD<3.6

Voltage ranges 0/1

Slave receiver mode 1.71<VDD<3.6

Voltage ranges 0/1

Slave mode transmitter/full duplex

2.7<VDD<3.6

Voltage ranges 0/1

Slave mode transmitter/full duplex

1.71<VDD<3.6

Voltage ranges 0/1

Slave mode transmitter/full duplex

1.71<VDD<3.6

Voltage range 2

Slave mode transmitter/full duplex

1.08<VDD<1.32(3)

tsu(NSS)

NSS setup time

Slave mode, SPI presc = 2

4×Tpclk

th(NSS)

NSS hold time

Slave mode, SPI presc = 2

2TTpclk

tw(SCKH)

tw(SCKL)

SCK high and low

time

Master mode

Tpclk-1

Tpclk

Tpclk+1

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