ST72344S2 datasheet(224/247 Pages) STMICROELECTRONICS

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Electrical characteristics

ST72344xx, ST2345xx

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Doc ID 12321 Rev 6

13.11

Communication interface characteristics

13.11.1

I2C and I²C3SNS interfaces

Subject to general operating conditions for VDD, fOSC, and TA unless otherwise specified.

Refer to I/O port characteristics for more details on the input/output alternate function

characteristics (SDAI and SCLI). The ST7 I2C and I2C3SNS interfaces meet the electrical

and timing requirements of the Standard I2C communication protocol.

TA = -40°C to 85°C, unless otherwise specified.

The following table gives the values to be written in the I2CCCR register to obtain the

required I2C SCL line frequency.

Note:

For speeds around 200 kHz, achieved speed can have

± 5% tolerance; for other speed

ranges, achieved speed can have

± 2% tolerance.

The above variations depend on the accuracy of the external components used.

Table 110.

I2C and I²C3SNS interfaces characteristics

Symbol

Parameter

Conditions

Min

Max

Unit

fSCL

I²C SCL frequency

fCPU=4 MHz to 8 MHz

(1),

VDD= 2.7 V to 5.5 V

The I2C and I2C3SNS interfaces will not function below the minimum clock speed of 4 MHz.

400

kHz

fSCL3SNS I²C3SNS SCL frequency

(2)

Not tested in production within the whole operating range. Guaranteed by design/validation test results.

400

kHz

Table 111.

SCL frequency table (multimaster I2C interface) (1)

RP = External pull-up resistance, fSCL = I

2C speed, NA = Not achievable.

fSCL

I2CCCR value

fCPU = 4 MHz.

fCPU = 8 MHz.

VDD = 3.3 V

VDD = 5 V

VDD = 3.3 V

VDD = 5 V

RP=3.3kΩ RP=4.7kΩ RP=3.3kΩ RP=4.7kΩ RP=3.3kΩ RP=4.7kΩ RP=3.3kΩ RP=4.7kΩ

400

84h

300

86h

85h

87h

200

84h

8Ah

8Bh

8Ch

100

11h

10h

11h

25h

24h

28h

25h

24h

25h

26h

4Bh

4Ch

53h

54h

60h

5Fh

60h

62h

FFh

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