ST72325J4B5 查看數據表（PDF） - STMicroelectronics
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ST72325J4B5
STMicroelectronics
ST72325J4B5 Datasheet PDF : 193 Pages
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ST72325
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
fSCL
(kHz)
400
300
200
100
50
20
I2CCCR Value
fCPU=4 MHz.
VDD = 4.1 V
VDD = 5 V
RP=3.3kΩ RP=4.7kΩ RP=3.3kΩ RP=4.7kΩ
NA
NA
NA
NA
fCPU=8 MHz.
VDD = 4.1 V
VDD = 5 V
RP=3.3kΩ RP=4.7kΩ RP=3.3kΩ RP=4.7kΩ
83h
83
83h
83h
NA
NA
NA
NA
85h
85h
85h
85h
83h
83h
83h
83h
8Ah
89h
8Ah
8Ah
10h
10h
10h
10h
24h
23h
24h
23h
24h
24h
24h
24h
4Ch
4Ch
4Ch
4Ch
5Fh
5Fh
5Fh
5Fh
FFh
FFh
FFh
FFh
Legend:
RP = External pull-up resistance
fSCL = I2C 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.
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