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參數資料
| 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： | 4/10頁 |
| 文件大小： | 96K |
| 代理商： | P82B715 |
Philips Semiconductors
Preliminary specification
82B715
I
2
C bus extender
1998 Jan 09
4
FUNCTIONAL DESCRIPTION
The 82B715 bipolar integrated circuit contains two identical buffer
circuits which enable I
2
C and similar bus systems to be extended
over long distances without degradation of system performance or
requiring the use of special cables.
The buffer has an effective current gain of ten from I
2
C bus to
Buffered bus. Whatever current is flowing out of the I
2
C bus side,
ten times that current will be flowing into the Buffered bus side (see
Figure 2).
As a consequence of this amplification the system is able to drive
capacitive loads up to ten times the standard limit on the Buffered
bus side. This current based buffering approach preserves the
bi-directional, open-collector/open-drain characteristic of the I
2
C
SDA/SCL lines.
To minimize interference and ensure stability, current rise and fall
rates are internally controlled.
APPLICATION NOTES
By using two (or more) 82B715 ICs, a sub-system can be built which
retains the interface characteristics of an I
2
C device so that it may
be included in, or optionally added to, any I
2
C or related system.
The sub-system features a low impedance or “Buffered” bus,
capable of driving large wiring capacities (see Figure 3).
I
2
C Systems
As with the standard I
2
C system, pull-up resistors are required to
aprovide the logic HIGH levels on the Buffered bus. (Standard
open-collector configuration of the I
2
C bus). The size and number of
these pull-up resistors depends on the system.
If the buffer is to be permanently connected into the system, the
circuit should be configured with only one pull-up resistor on the
Buffered bus and none on the I
2
C bus.
Alternatively a buffer may be connected to an existing I
2
C system. In
this case the Buffered bus pull-up will act in parallel with the I
2
C bus
pull-up.
CURRENT
SENSE
V
CC
10 (I
B
)
BUFFERED BUS
L
X
I
2
C BUS
S
X
I
B
GND
SU00292
Figure 2. Equivalent Circuit: One Half 82B715
1/2
1/2
SDA
SCL
STANDARD
I
2
C
INTERFACE
BUFFERED
INTERFACE
V
CC
V
CC
LONG
CABLE
1/2
1/2
BUFFERED
INTERFACE
LDA
82B715
82B715
LCL
SDA
SCL
STANDARD
I
2
C
INTERFACE
I
2
C
DEVICE
SU00293
Figure 3. Minimum Sub-System with 82B715
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 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: 安裝風格:SMD/SMT 封裝 / 箱體:VSSOP-8 封裝:Reel |
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