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BA8274F датащи(PDF) 6 Page - Rohm

номер детали BA8274F
подробное описание детали  I2C bus line buffer IC
Download  9 Pages
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производитель  ROHM [Rohm]
домашняя страница  http://www.rohm.com
Logo ROHM - Rohm

BA8274F датащи(HTML) 6 Page - Rohm

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BA8274 / F
Audio ICs
6/8
2. Loading calculations for the expanded I
2C bus.
SDA
SDA
LDA
BA8274/F
3000pF
Fig.4
BA8274/F
VCC
5V
EXISTING
PROPOSED BUS EXPANSION
GND
0V
R3
R2
R1
I
2
C
I
2
C
= 333k
R2 =
1
µsec
3000pF
Buffered bus pull-up
Effective capacitance
Buffered line
Wiring Cap.
3000pF
Total Cap.
3000pF
= 20k
R1 =
1
µsec
50pF
I2C pull-up
Effective capacitance
Near I2C devices
2
× I2C Devices 20pF
Strays
20pF
BA8274 Buffer
10pF
Total Cap.
50pF
= 33k
R3 =
1
µsec
30pF
I2C pull-up
Effective capacitance
Remote I2C devices
1
× I2C Devices 10pF
Strays
10pF
BA8274 Buffer
10pF
Total Cap.
30pF
As an addition to an existing system:
R2 =
= 300
R2
× 0.1R3
R2
+ 0.1R3
R1 = 20k
R3 not required since buffer always connected.
For a permanent system:
R2 =
= 262
1
++
1
0.1R1
1
0.1R2
1
0.1R3
R1 and R3 not required since buffer always connected.


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