STM32L431 datasheet(158/200 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32L431xx

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DocID028800 Rev 1

SPI characteristics

Unless otherwise specified, the parameters given in Table 82 for SPI are derived from tests

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

summarized in Table 21: General operating conditions.

•

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

•

Capacitive load C = 30 pF

•

Measurement points are done at CMOS levels: 0.5 ₓ VDD

Refer to Section 6.3.14: I/O port characteristics for more details on the input/output alternate

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

Table 82. SPI characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fSCK

1/tc(SCK)

SPI clock frequency

Master mode receiver/full duplex

2.7 < VDD < 3.6 V

Voltage Range 1

MHz

Master mode receiver/full duplex

1.71 < VDD < 3.6 V

Voltage Range 1

Master mode transmitter

1.71 < VDD < 3.6 V

Voltage Range 1

Slave mode receiver

1.71 < VDD < 3.6 V

Voltage Range 1

Slave mode transmitter/full duplex

2.7 < VDD < 3.6 V

Voltage Range 1

37(2)

Slave mode transmitter/full duplex

1.71 < VDD < 3.6 V

Voltage Range 1

20(2)

Voltage Range 2

tsu(NSS) NSS setup time

Slave mode, SPI prescaler = 2

4ₓTPCLK

th(NSS) NSS hold time

Slave mode, SPI prescaler = 2

2ₓTPCLK

tw(SCKH)

tw(SCKL)

SCK high and low time

Master mode

TPCLK-2

TPCLK

TPCLK+2

tsu(MI)

Data input setup time

Master mode

tsu(SI)

Slave mode

1.5

th(MI)

Data input hold time

Master mode

6.5

th(SI)

Slave mode

1.5

ta(SO)

Data output access time Slave mode

tdis(SO) Data output disable time Slave mode

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