ST72325AR7-Auto datasheet(218/243 Pages) STMICROELECTRONICS

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ST72325xxx-Auto

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Doc ID 13770 Rev 3

Figure 94.

Typical application with I2C BUS and timing diagram(1)

Measurement points are done at CMOS levels: 0.3xVDD and 0.7xVDD.

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

required I2C SCL line frequency.

Legend:

= External pull-up resistance

fSCL = I

2C speed

Note:

- For speeds around 200 kHz, the achieved speed can have a

±5% tolerance.

- For other speed ranges, the achieved speed can have a

±2% tolerance.

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

REPEATED START

START

STOP

START

tf(SDA)

tr(SDA)

tsu(SDA)

th(SDA)

tf(SCK)

tr(SCK)

tw(SCKL)

tw(SCKH)

th(STA)

tsu(STO)

tsu(STA)

tw(STO:STA)

SDA

SCK

4.7k



SDAI

ST72XXX

SCLI

VDD

100



100



VDD

4.7k



I2CBUS

Table 136.

SCL frequency table

fSCL

(kHz)

I2CCCR value

fCPU =4MHz

fCPU =8MHz

VDD = 4.1V

VDD = 5V

VDD = 4.1V

VDD = 5V

RP =3.3k RP =4.7k RP =3.3k RP =4.7k RP =3.3k RP =4.7k RP =3.3k RP =4.7k

400

Not achievable

83h

300

Not achievable

85h

200

83h

8Ah

89h

8Ah

100

10h

24h

23h

24h

23h

24h

4Ch

5Fh

FFh

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