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参数资料
| 型号： | HCPL-7721#500 |
| 厂商： | AGILENT TECHNOLOGIES INC |
| 元件分类： | 光电耦合器 |
| 英文描述： | 1 CHANNEL LOGIC OUTPUT OPTOCOUPLER, 25 Mbps |
| 封装： | 0.300 INCH, SURFACE MOUNT, DIP-8 |
| 文件页数： | 7/18页 |
| 文件大小： | 437K |
| 代理商： | HCPL-7721#500 |
15
Figure 20. Isolated node providing power to the network.
Isolated Node Providing Power to
the Network
Figure 20 shows a node providing
power to the network. The AC line
powers a regulator which
provides five (5) volts locally. The
AC line also powers a 24 volt
isolated supply, which powers the
network, and another five-volt
regulator, which, in turn, powers
the transceiver and isolated
(network) side of the two
optocouplers. This method is
recommended when there are a
limited number of devices on the
network that don’t require much
power, thus eliminating the need
for separate power supplies.
More importantly, the unique
“dual-inverting” design of the
HCPL-772X/072X ensure the
network will not “lock-up” if
either AC line power to the node
is lost or the node powered-off.
Specifically, when input power
(VDD1) to the HCPL-772X/072X
located in the transmit path is
eliminated, a RECESSIVE bus
state is ensured as the
HCPL-772X/072X output voltage
(VO) go HIGH.
NODE/APP SPECIFIC
uP/CAN
HCPL
772x/072x
HCPL
772x/072x
TRANSCEIVER
5 V REG.
V+ (SIGNAL)
V– (SIGNAL)
V+ (POWER)
V– (POWER)
GALVANIC
ISOLATION
BOUNDARY
AC LINE
DRAIN/SHIELD
SIGNAL
POWER
ISOLATED
SWITCHING
POWER
SUPPLY
5 V REG.
DEVICENET NODE
Figure 19. Isolated node with transceiver powered by the network.
NODE/APP SPECIFIC
uP/CAN
HCPL
772x/072x
HCPL
772x/072x
TRANSCEIVER
NON ISO
5 V
REG.
NETWORK
POWER
SUPPLY
V+ (SIGNAL)
V– (SIGNAL)
V+ (POWER)
V– (POWER)
GALVANIC
ISOLATION
BOUNDARY
AC LINE
DRAIN/SHIELD
SIGNAL
POWER
*HCPL
772x/072x
* OPTIONAL FOR BUS V + SENSE
node with an un-powered isolated
Physical Layer will accumulate
errors and become bus-off if it
attempts to transmit. The Bus V+
sense signal would be used to
change the BOI attribute of the
DeviceNet Object to the “auto-
reset” (01) value. Refer to Volume
1, Section 5.5.3. This would cause
the node to continually reset until
bus power was detected. Once
power was detected, the BOI
attribute would be returned to the
“hold in bus-off” (00) value. The
BOI attribute should not be left in
the “auto-reset” (01) value since
this defeats the jabber protection
capability of the CAN error
confinement. Any inexpensive
low frequency optical isolator can
be used to implement this feature.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| HCPL-7721-500E | 功能描述:高速光耦合器 1Ch 10mA 600mW RoHS:否 制造商:Avago Technologies 电流传递比: 最大波特率: 最大正向二极管电压:1.75 V 最大反向二极管电压:5 V 最大功率耗散:40 mW 最大工作温度:+125 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-5 封装:Tube |
| HCPL-7721-520 | 功能描述:高速光耦合器 1Ch 10mA 600mW RoHS:否 制造商:Avago Technologies 电流传递比: 最大波特率: 最大正向二极管电压:1.75 V 最大反向二极管电压:5 V 最大功率耗散:40 mW 最大工作温度:+125 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-5 封装:Tube |
| HCPL-7721-520E | 功能描述:高速光耦合器 1Ch 10mA 600mW RoHS:否 制造商:Avago Technologies 电流传递比: 最大波特率: 最大正向二极管电压:1.75 V 最大反向二极管电压:5 V 最大功率耗散:40 mW 最大工作温度:+125 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-5 封装:Tube |
| HCPL-7721-560E | 功能描述:高速光耦合器 1Ch 10mA 600mW RoHS:否 制造商:Avago Technologies 电流传递比: 最大波特率: 最大正向二极管电压:1.75 V 最大反向二极管电压:5 V 最大功率耗散:40 mW 最大工作温度:+125 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-5 封装:Tube |
| HCPL-7723 | 功能描述:高速光耦合器 50Mbd 2ns PWD RoHS:否 制造商:Avago Technologies 电流传递比: 最大波特率: 最大正向二极管电压:1.75 V 最大反向二极管电压:5 V 最大功率耗散:40 mW 最大工作温度:+125 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-5 封装:Tube |
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