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ADM1178-1ARMZ-R7

更新时间： 2024-11-29 03:53:15
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亚德诺 - ADI 监视器控制器
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16页 203K
描述
Hot Swap Controller and Digital Power Monitor with AlertB Output

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ADM1178-1ARMZ-R7 数据手册

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Hot Swap Controller and  
Digital Power Monitor with AlertB Output  
Preliminary Technical Data  
ADM1178  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
Allows Safe Board Insertion and Removal from a Live  
Backplane  
Controls Supply Voltages from 3.15 V to14 V  
Precision Current Sense Amplifier  
ADM1178  
Mux  
V
I
VCC  
0
1
SDA  
SCL  
ADR  
12-Bit  
ADC  
+
A
-
I2C  
Precision Voltage Input  
SENSE  
12-Bit ADC for Current and Voltage Readback  
Charge Pumped Gate Drive for External N-FET Switch  
Adjustable Analog Current Limit with Circuit Breaker  
Fast Response Limits Peak Fault Current  
Automatic Retry or Latch-Off On Current Fault  
Programmable hot swap timing via TIMER pin  
Active-high ON pin  
Current Sense  
Amplifier  
Alert  
ALERTB  
GATE  
FET Drive  
Controller  
+
ON  
-
1.3V  
UV Comparator  
AlertB pin for overcurrent interrupt  
I2C Fast Mode compliant interface (400 KHz max)  
10-lead MSOP package  
TIMER  
GND  
Figure 1.  
APPLICATIONS DIAGRAM  
APPLICATIONS  
Power Monitoring/Power Budgeting  
Central office Equipment  
RSENSE  
N-Channel FET  
3.15V - 14V  
Telecommunication and Datacommunication Equipment  
PC/Servers  
SENSE  
Vcc  
CONTROLLER  
GATE  
ADM1178  
GENERAL DESCRIPTION  
SDA  
SCL  
SDA  
SCL  
ON  
P=VI  
The ADM1178 is an integrated hotswap controller and current  
sense amplifier that offers digital current and voltage  
monitoring via an on-chip 12-bit ADC, communicated through  
an I2C interface.  
TIMER  
ALERTB  
ADR  
INTERRUPT  
GND  
Figure 2.  
An internal current sense amplifier senses voltage across the  
sense resistor in the power path via the VCC and SENSE pins.  
A 12-bit ADC can measure the current seen in the sense  
resistor, and also the supply voltage on the VCC pin.  
The ADM1178 limits the current through this resistor by  
controlling the gate voltage of an external N-channel FET in the  
power path, via the GATE pin. The sense voltage (and hence the  
inrush current) is kept below a preset maximum.  
An industry standard I2C interface allows a controller to read  
current and voltage data from the ADC. Measurements can be  
initiated by an I2C command. Alternatively the ADC can run  
continuously and the user can read the latest conversion data  
whenever it is required. Up to 4 unique I2C addresses can be  
created by the way the ADR pin is connected.  
The ADM1178 protects the external FET by limiting the time  
that it spends with the maximum current running in it. This  
current limit period is set by the choice of capacitor attached to  
the TIMER pin. Additionally, the device provides protection  
from overcurrent events at times after the hot-swap event is  
complete. In the case of a short-circuit event the current in the  
sense resistor will exceed an overcurrent trip threshold, and the  
FET will be switched off immediately by pulling down the  
GATE pin.  
The ADM1178 is packaged in a 10-lead MSOP package.  
Rev. PrD May 2006  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rights of third parties that may result from its use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
© 2006 Analog Devices, Inc. All rights reserved.  
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