STM32WB15CC datasheet(112/127 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32WB15CC

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DS13258 Rev 4

This limits the maximum load Cload supported in Fast-mode Plus, given by these formulas:



tr(SDA/SCL) = 0.8473 x Rp x Cload



Rp(min) = [VDD - VOL(max)] / IOL(max)

where Rp is the I2C lines pull-up. Refer to Section 6.3.16 for the I2C I/Os characteristics.

All I2C SDA and SCL I/Os embed an analog filter, refer to Table 79 for its characteristics.

SPI characteristics

Unless otherwise specified, the parameters given in Table 80 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 set at CMOS levels: 0.5 x VDD

Refer to Section 6.3.16 for more details on the input/output alternate function characteristics

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

Table 79. I2C analog filter characteristics(1)

1. Specified by design, not tested in production.

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.

100(3)

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

Table 80. SPI characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fSCK

1/tc(SCK)

SPI clock frequency

Master mode



1.71 < VDD < 3.6 V

MHz

Slave receiver mode



1.71 < VDD < 3.6 V

Slave mode transmitter/full duplex



2.7 < VDD < 3.6 V

32(2)

Slave mode transmitter/full duplex



1.71 < VDD < 3.6 V

24(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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