32G431 datasheet(151/198 Pages) STMICROELECTRONICS

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STM32G431x6 STM32G431x8 STM32G431xB

Electrical characteristics

160

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

•

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 VDDIOx is disabled, but is still present.

•

The 20mA output drive requirement in Fast-mode Plus is supported partially. This limits

the maximum load Cload supported in Fm+, which is 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 5.3.14: I/O port characteristics for the

I2C I/Os characteristics.

All I2C SDA and SCL I/Os embed an analog filter. Refer to Table 82 below for the analog

filter characteristics:

SPI characteristics

Unless otherwise specified, the parameters given in Table 83 for SPI are derived from tests

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

summarized in Table 17: 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 5.3.14: I/O port characteristics for more details on the input/output alternate

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

Table 81. Minimum I2CCLK frequency in all I2C modes

Symbol

Parameter

Condition

Min

Unit

f(I2CCLK)

I2CCLK

frequency

Standard mode

MHz

Fast-mode

Analog Filtre ON

DNF=0

Analog Filtre OFF

DNF=1

Fast-mode

Plus

Analog Filtre ON

DNF=0

Analog Filtre OFF

DNF=1

Table 82. 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.

90(3)

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

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