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參數(shù)資料
| 型號(hào)： | P82B715 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | I2C bus extender |
| 中文描述： | I2C總線擴(kuò)展 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 96K |
| 代理商： | P82B715 |
Philips Semiconductors
Preliminary specification
82B715
I
2
C bus extender
1998 Jan 09
6
The capacitance figures for one or more individual I
2
C bus nodes
should be multiplied by a factor of 10 times, and then added to the
Buffered bus capacitance. Calculation of a new Buffered bus pull-up
resistor will alllow this single pull-up resistor to act for both the
included I
2
C bus nodes and the Buffered bus. Thus it is possible to
combine some or all of these separate pull-up resistors into a single
resistor on the Buffered bus (the value of which is calculated from
the sum of the scaled capacitances on the Buffered bus). If the
buffer is to be permanently connected into the system then all the
separate pull-up resistors should be combined. But if it is to be
connected by adding it onto an existing system, then only those on
the additional I
2
C bus system can be combined onto the Buffered
bus if the original system is required to be able to still operate on a
stand-alone basis.
A further restriction is that the maximum pull-up current, with the bus
LOW, should not exceed the I
2
C bus specification maximum of 3mA,
or 30mA on the Buffered bus. The following formula applies:
V
CC
0.4
R
P
30mA
Where: R
P
= scaled parallel combination of all pull-up resistors.
If this condition is met, the fall time specifications will also be met.
Figure 4 shows typical loading calculations for the expanded I
2
C
bus.
Sx, Sy, I
2
C Bus, SDA or SCL
Because the two buffer circuits in the 82B715 are identical either
input pin can be used as the I
2
C Bus SDA data line, or the SCL
clock line.
Lx, Ly, Buffered Bus, LDA or LCL
On the buffered low impedance line side, the corresponding output
becomes LDA and LCL.
V
CC
, GND — Positive and Negative Supply Pins
In normal use the power supply voltages at each end of the low
impedance line should be comparable. If these differ by a significant
amount, noise margin is sacrificed.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| P82B715D | 功能描述:接口-信號(hào)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(hào)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(hào)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(hào)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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