STM32U073RCT6 datasheet(104/146 Pages) STMICROELECTRONICS

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Prescaler

WDGTB

Min timeout value

Max timeout value

Unit

0.2867

18.3501

6.3.27

I2C-bus interface characteristics

The I2C interface meets the timings requirements of the I2C-bus specification and user manual rev. 03 for:

•

Standard-mode (Sm): with a bit rate up to 100 kbit/s

•

Fast-mode (Fm): with a bit rate up to 400 kbit/s

•

Fast-mode Plus (Fm+): with a bit rate up to 1 Mbit/s.

When the I2C peripheral is properly configured, the I2C timings requirements are specified by design, and not

tested in production (refer to RM0503 reference manual).

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. Only FT_f I/O pins support Fm+ low level output current maximum requirement. Refer

to Section 6.3.14: I/O port characteristics for the I2C I/Os characteristics.

All I2C SDA and SCL I/Os embed an analog filter. Refer to the table below for the analog filter characteristics:

Table 85. I2C analog filter characteristics

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(1)

205(2)

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

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

6.3.28

USART characteristics

Unless otherwise specified, the parameters given in Table 86 are derived from tests performed under the ambient

temperature, fPCLK frequency and supply voltage conditions summarized in Section 6.3.1: General operating

conditions. The additional general conditions are:

•

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

•

Capacitive load CL = 30 pF

•

Measurement points are done at CMOS levels: 0.5×VDD

•

Voltage scale is set to VOS[1:0] = 01

Refer to Section 6.3.14: I/O port characteristics for more details on the input/output alternatefunction

characteristics (NSS, CK, TX, and RX for USART).

STM32U073x8/B/C

Electrical characteristics

DS14548 - Rev 2

page 104/146

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