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STR710FZ2H6 bảng dữ liệu(PDF) 62 Page - STMicroelectronics

tên linh kiện STR710FZ2H6
Giải thích chi tiết về linh kiện  ARM7TDMI??32-bit MCU with Flash, USB, CAN 5 timers, ADC, 10 communications interfaces
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Electrical parameters
STR71xF
62/77
period of SCL signal.
4.
Measurement points are done at CMOS levels: 0.3xVDD and 0.7xVDD.
5.
fPCLK1, must be at least 8MHz to achieve max fast I
2C speed (400kHz).
6.
The following table gives the values to be written in the I2CCCR register to obtain the required I2C SCL line
frequency.
Figure 33.
Typical Application with I2C Bus and Timing Diagram 4)
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.
Table 35.
SCL Frequency Table (fPCLK1=8 MHz.,V33 = 3.3 V)
fSCL
(kHz)
I2CCCR Value
RP=4.7kΩ
400
83
300
85h
200
8Ah
100
24h
50
4Ch
20
C4h
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
SCL
4.7k
Ω
SDA
STR7
SCL
VDD
100
Ω
100
Ω
VDD
4.7k
Ω
I2CBUS



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