STM32WB55CC datasheet(144/165 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32WB55xx

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DS11929 Rev 3

All I2C SDA and SCL I/Os embed an analog filter. Refer to Table 89 for the analog filter

characteristics:

SPI characteristics

Unless otherwise specified, the parameters given in Table 90 for SPI are derived from tests

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

summarized in Table 22: 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 6.3.17: I/O port characteristics for more details on the input/output alternate

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

Table 89. I2C analog filter characteristics(1)

1. Guaranteed by design.

Symbol

Parameter

Min

Max

Unit

tAF

Maximum pulse width of spikes that

are suppressed by the analog filter

50(2)

2. Spikes with widths below tAF(min) are filtered.

110(3)

3. Spikes with widths above tAF(max) are not filtered

Table 90. SPI characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fSCK

1/tc(SCK)

SPI clock frequency

Master mode

1.65 < VDD < 3.6 V

Voltage Range 1

MHz

Master transmitter mode

1.65 < VDD < 3.6 V

Voltage Range 1

Slave receiver mode

1.65 < VDD < 3.6 V

Voltage Range 1

Slave mode transmitter/full duplex

2.7 < VDD < 3.6 V

Voltage Range 1

32(2)

Slave mode transmitter/full duplex

1.65 < VDD < 3.6 V

Voltage Range 1

20.5(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 - 1.5

TPCLK

TPCLK + 1

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