STM32G0 datasheet(101/135 Pages) STMICROELECTRONICS

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DS12232 Rev 4

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STM32G071x8/xB

Electrical characteristics

107

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 VDDIO1 is disabled, but is still present. Only FT_f I/O pins

support Fm+ low-level output current maximum requirement. 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 the following table for its

characteristics:

SPI/I2S characteristics

Unless otherwise specified, the parameters given in Table 70 for SPI are derived from tests

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

summarized in Table 21: General operating conditions. The additional general conditions

are:

•

OSPEEDRy[1:0] set to 11 (output speed)

•

capacitive load C = 30 pF

•

measurement points 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 68. Minimum I2CCLK frequency

Symbol

Parameter

Condition

Typ

Unit

fI2CCLK(min)

Minimum I2CCLK

frequency for correct

operation of I2C

peripheral

Standard-mode

MHz

Fast-mode

Analog filter enabled

DNF = 0

Analog filter disabled

DNF = 1

Fast-mode Plus

Analog filter enabled

DNF = 0

Analog filter disabled

DNF = 1

Table 69. I2C analog filter characteristics(1)

Symbol

Parameter

Min

Max

Unit

tAF

Limiting duration of spikes suppressed

by the filter(2)

260

1. Based on characterization results, not tested in production.

2. Spikes shorter than the limiting duration are suppressed.

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