STM32WB50CG datasheet(106/119 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32WB50CG STM32WB30CE

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DS13047 Rev 5

The I2C timings requirements are guaranteed by design when the I2C peripheral is properly

configured (refer to the reference manual RM0471).

The SDA and SCL I/O requirements are met with the following restriction: the SDA and SCL

I/O pins are not “true” open-drain. When configured as open-drain, the PMOS connected

between the I/O pin and VDD is disabled, but is still present. The 20 mA output drive

requirement in Fast-mode Plus is supported partially.

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 6.3.17 for the I2C I/Os characteristics.

All I2C SDA and SCL I/Os embed an analog filter, refer to Table 81 for its characteristics.

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 20: 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 for more details on the input/output alternate function characteristics

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

Table 80. Minimum I2CCLK frequency in all I2C modes

Symbol

Parameter

Condition

Min

Unit

f(I2CCLK)

I2CCLK

frequency

Standard-mode

MHz

Fast-mode

Analog filter ON, DNF = 0

Analog filter OFF, DNF = 1

Fast-mode Plus

Analog filter ON, DNF = 0

Analog filter OFF, DNF = 1

Table 81. 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.

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