STM32F303XD datasheet(125/173 Pages) STMICROELECTRONICS

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STM32F303xD STM32F303xE

Electrical characteristics

151

6.3.18

Communications interfaces

I2C 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 1Mbits/s

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

configured (refer to Reference manual).

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

SCL I/O pins are “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 FTf I/O pins support

Fm+ low level output current maximum requirement. Refer to Section 6.3.15: I/O port

characteristics.

All I2C I/Os embed an analog filter, refer to the Table 73: I2C analog filter characteristics.

Table 71. IWDG min/max timeout period at 40 kHz (LSI) (1)

1. These timings are given for a 40 kHz clock but the microcontroller internal RC frequency can vary from 30

to 60 kHz. Moreover, given an exact RC oscillator frequency, the exact timings still depend on the phasing

of the APB interface clock versus the LSI clock so that there is always a full RC period of uncertainty.

Prescaler divider

PR[2:0] bits

Min timeout (ms) RL[11:0]=

0x000

Max timeout (ms) RL[11:0]=

0xFFF

0.1

409.6

0.2

819.2

/16

0.4

1638.4

/32

0.8

3276.8

/64

1.6

6553.6

/128

3.2

13107.2

/256

6.4

26214.4

Table 72. WWDG min-max timeout value @72 MHz (PCLK)(1)

1. Guaranteed by design, not tested in production.

Prescaler

WDGTB

Min timeout value

Max timeout value

0.05687

3.6409

0.1137

7.2817

0.2275

14.564

0.4551

29.127

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