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參數(shù)資料
| 型號： | P82B715 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | I2C bus extender |
| 中文描述： | I2C總線擴展 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大小： | 96K |
| 代理商： | P82B715 |
Philips Semiconductors
Preliminary specification
82B715
I
2
C bus extender
1998 Jan 09
7
R3
R2
LDA
SDA
I
2
C
PROPOSED BUS EXPANSION
5V
0V
3nF
R1
I
2
C
I
2
C
SDA
SDA
EXISTING
GND
V
CC
EFFECTIVE CAPACITANCE
NEAR I
2
C DEVICES
EFFECTIVE CAPACITANCE
BUFFERED LINE
EFFECTIVE CAPACITANCE
REMOTE I
2
C DEVICES
2
×
I
2
C Devices
20pF
20pF
10pF
–––––
50pF
Strays
82B715 Buffer
TOTAL CAP.
Wiring Cap.
3000pF
–––––
3000pF
TOTAL CAP.
1
×
I
2
C Devices
10pF
10pF
10pF
–––––
30pF
Strays
82B715 Buffer
TOTAL CAP.
I
2
C pull-up
Buffered Bus pull-up
I
2
C pull-up
R1
1 sec
50pF
20K
R2
1 sec
3000pF
333
R3
1 sec
30pF
33K
AS AN ADDITION TO AN EXISTING SYSTEM * :
R1 = 20K
R2
R2
R2
0.1R3
0.1R3
300
R3 not required since
buffer always connected
FOR A PERMANENT SYSTEM * :
R2
1
1
1
0.1R1
0.1R2
1
0.1R3
262
R3 not required since
buffer always connected
R1 not required since
buffer always connected
* NOTE:
R1, R2 and R3 are calculated from the capacitive loading and a 1
μ
sec time constant on each bus node. For an addition to an existing
system, R2’ (the new value for R2) is shown as being calculated from the parallel combination of R2 and the scaled value of R3;
while for a permanent system R2, and scaled values of R1 and R3 have been used. Note that this example has used scaled resistor
values and combined the node and cable capacitances.
(5
0.4)V
260
17.6mA
30mA
CHECK FOR MAXIMUM PULL-UP CURRENT:
SU00294
Figure 4. Typical Loading Calculation: I
2
C Bus with 82B715
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|---|---|
| P82B715D | 功能描述:接口-信號緩沖器、中繼器 I2C Bus Extender RoHS:否 制造商:Texas Instruments 工作電源電壓: 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VSSOP-8 封裝:Reel |
| P82B715D | 制造商:Texas Instruments 功能描述:IC I2C BUS EXTENDER 8-SOIC |
| P82B715DG4 | 功能描述:接口-信號緩沖器、中繼器 I2C Bus Extender RoHS:否 制造商:Texas Instruments 工作電源電壓: 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VSSOP-8 封裝:Reel |
| P82B715DR | 功能描述:接口-信號緩沖器、中繼器 I2C Bus Extender RoHS:否 制造商:Texas Instruments 工作電源電壓: 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VSSOP-8 封裝:Reel |
| P82B715DRG4 | 功能描述:接口-信號緩沖器、中繼器 I2C Bus Extender RoHS:否 制造商:Texas Instruments 工作電源電壓: 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VSSOP-8 封裝:Reel |
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