ST72F521 datasheet(192/215 Pages) STMICROELECTRONICS

192 / 215 page

ST72F521, ST72521B

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COMMUNICATION INTERFACE CHARACTERISTICS (Cont’d)

The following table gives the values to be written in

the I2CCCR register to obtain the required I2C

SCL line frequency.

Table 28. SCL Frequency Table

Legend:

RP = External pull-up resistance

fSCL = I

2C speed

NA = Not achievable

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.

12.11.3 CAN - Controller Area Network Interface

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

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

(CANTX and CANRX).

Notes:

1. Data based on simulation results, not tested in production

fSCL

(kHz)

I2CCCR Value

fCPU=4 MHz.

fCPU=8 MHz.

VDD = 4.1 V

VDD = 5 V

VDD = 4.1 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

83h

300

85h

200

83h

8Ah

89h

8Ah

100

10h

24h

23h

24h

23h

24h

4Ch

5Fh

FFh

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

tp(RX:TX) CAN controller propagation time

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