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BA8274 データシートの表示(PDF) - ROHM Semiconductor
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コンポーネント説明
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BA8274
I2C bus line buffer IC
ROHM Semiconductor
BA8274 Datasheet PDF : 9 Pages
1
2
3
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6
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8
9
Audio ICs
2. Loading calculations for the expanded I
2
C bus.
EXISTING
V
CC
R1
PROPOSED BUS EXPANSION
R2
R3
BA8274 / F
5V
SDA
I
2
C
BA8274/F
LDA
BA8274/F
SDA
I
2
C
3000pF
GND
0V
Fig.4
Effective capacitance
Near I
2
C devices
2
×
I
2
C Devices
Strays
BA8274 Buffer
20pF
20pF
10pF
Total Cap. 50pF
I
2
C pull-up
R1 =
1
µ
sec
= 20k
Ω
50pF
Effective capacitance
Buffered line
Wiring Cap. 3000pF
Total Cap. 3000pF
Buffered bus pull-up
R2 =
1
µ
sec
= 333k
Ω
3000pF
As an addition to an existing system:
R1 = 20k
Ω
R2 =
R2
×
0.1R3
= 300
Ω
R2
+
0.1R3
R3 not required since buffer always connected.
For a permanent system:
1
R2 =
1
0.1R1
+
1
0.1R2
+
1
0.1R3
= 262
Ω
R1 and R3 not required since buffer always connected.
Effective capacitance
Remote I
2
C devices
1
×
I
2
C Devices
Strays
BA8274 Buffer
10pF
10pF
10pF
Total Cap. 30pF
I
2
C pull-up
R3 =
1
µ
sec
= 33k
Ω
30pF
6/8
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