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參數(shù)資料
| 型號(hào)： | PCA9515AD |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | I2C/I2S |
| 英文描述： | I2C-bus repeater |
| 封裝： | PCA9515AD<SOT96-1 (SO8)|<<http://www.nxp.com/packages/SOT96-1.html<1<week 5, 2005,;PCA9515AD<SOT96-1 (SO8)|<<http://www.nxp.com/packages/SOT96-1.html<1<week 5, 2005 |
| 文件頁數(shù)： | 4/18頁 |
| 文件大小： | 104K |
| 代理商： | PCA9515AD |
PCA9515A_4
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 04 — 11 April 2008
4 of 18
NXP Semiconductors
PCA9515A
I
2
C-bus repeater
6.
Functional description
Refer to
Figure 1 “Functional diagram of PCA9515A”
.
The PCA9515A integrated circuit contains two identical buffer circuits which enable
I
2
C-bus and similar bus systems to be extended without degradation of system
performance.
The PCA9515A contains two bidirectional, open-drain buffers specifically designed to
support the standard LOW-level contention arbitration of the I
2
C-bus. Except during
arbitration or clock stretching, the PCA9515A acts like a pair of non-inverting, open-drain
buffers, one for SDA and one for SCL.
6.1 Enable
The EN pin is active HIGH with an internal pull-up and allows the user to select when the
repeater is active. This can be used to isolate a badly behaved slave on power-up until
after the system power-up reset. It should never change state during an I
2
C-bus operation
because disabling during a bus operation will hang the bus and enabling part way through
a bus cycle could confuse the I
2
C-bus parts being enabled.
The enable pin should only change state when the global bus and the repeater port are in
an idle state to prevent system failures.
6.2 I
2
C-bus systems
As with the standard I
2
C-bus system, pull-up resistors are required to provide the logic
HIGH levels on the buffered bus (standard open-collector configuration of the I
2
C-bus).
The size of these pull-up resistors depends on the system, but each side of the repeater
must have a pull-up resistor. This part designed to work with Standard-mode and
Fast-mode I
2
C-bus devices in addition to SMBus devices. Standard-mode I
2
C-bus devices
only specify 3 mA output drive; this limits the termination current to 3 mA in a generic
I
2
C-bus system where Standard-mode devices and multiple masters are possible. Under
certain conditions higher termination currents can be used.
Please see Application Note AN255, I
2
C/SMBus Repeaters, Hubs and Expandersfor
additional information on sizing resistors and precautions when using more than one
PCA9515A/PCA9516A in a system or using the PCA9515A/PCA9516A in conjunction
with the P82B96.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCA9515AD,112 | 功能描述:接口-信號(hào)緩沖器、中繼器 I2C BUS REPEATER 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 |
| PCA9515AD,118 | 功能描述:接口-信號(hào)緩沖器、中繼器 I2C BUS REPEATER 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 |
| PCA9515AD,118-CUT TAPE | 制造商:NXP 功能描述:PCA9515A Series 3.6 V 2-Channel Bidirectional Buffer I2C-bus repeater - SOIC - 8 |
| PCA9515AD | 制造商:Texas Instruments 功能描述:1WO-CHANNEL BIDIRECTIONAL ((NW)) |
| PCA9515AD/G,118 | 制造商:NXP Semiconductors 功能描述:Tape & Reel |
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