ST7FOXK2 datasheet(194/226 Pages) STMICROELECTRONICS

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Electrical characteristics

ST7FOXF1, ST7FOXK1, ST7FOXK2

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12.5

Communication interface characteristics

12.5.1

I2C interface

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 interface meets the electrical and timing

requirements of the Standard I2C communication protocol.

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

Table 102 gives the values to be written in the I2CCCR register to obtain the required I2C

SCL line frequency.

Table 74.

I2C interface characteristics

Symbol

Parameter

Conditions

Min

Max

Unit

fSCL

(1)

The I2C interface will not function below the minimum clock speed of 4 MHz (see Table 75).

I²C SCL frequency

fCPU=4 MHz to 8 MHz,

VDD= 4.5 to 5.5 V

400

kHz

Table 75.

SCL frequency (multimaster I2C interface)(1)(2)(3)

fSCL

I2CCCR Value

fCPU = 4 MHz, VDD = 5 V

fCPU = 8 MHz, VDD = 5 V

RP=3.3kΩ

RP=4.7kΩ

RP=3.3kΩ

RP=4.7kΩ

400

84h

300

86h

200

84h

8Ah

100

11h

25h

24h

25h

4Dh

4Ch

61h

62h

FFh

RP = External pull-up resistance, fSCL = I

2C speed.

For fast mode speeds, 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.

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