STM32MP151AAA3T datasheet(211/245 Pages) STMICROELECTRONICS

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DS12500 Rev 1

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STM32MP151A

Electrical characteristics

228

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 VDD is disabled, but is still present.

•

The 20 mA output drive requirement in Fast-mode Plus is not supported. This limits the

maximum load Cload supported in Fm+, which is given by these formulas:

tr(SDA/SCL) = 0.8473 × Rp × Cload

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

Where Rp is the I2C lines pull-up. Refer to Section 0.3.16: I/O port characteristics for the I2C

I/Os characteristics.

All I2C SDA and SCL I/Os embed an analog filter. Refer to Table 92 for the analog filter

characteristics:

The I2C pins can be set in FM+ mode in SYSCFG_PMCR register.

Unless otherwise specified, the parameters given in Table 55 are derived from tests

performed under the ambient temperature and VDD supply voltage conditions summarized

in Table 13: General operating conditions.

Table 91. Minimum i2c_ker_ck 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 92. 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

70(2)

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

120(3)

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

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