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ADM1178-1ARMZ-R7 bảng dữ liệu(PDF) 1 Page - Analog Devices |
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ADM1178-1ARMZ-R7 bảng dữ liệu(HTML) 1 Page - Analog Devices |
1 / 16 page Hot Swap Controller and Digital Power Monitor with AlertB Output Preliminary Technical Data ADM1178 Rev. PrD May 2006 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesfor itsuse,norfor anyinfringements ofpatents orother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 © 2006 Analog Devices, Inc. All rights reserved. FEATURES Allows Safe Board Insertion and Removal from a Live Backplane Controls Supply Voltages from 3.15 V to14 V Precision Current Sense Amplifier Precision Voltage Input 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 AlertB pin for overcurrent interrupt I2C Fast Mode compliant interface (400 KHz max) 10-lead MSOP package APPLICATIONS Power Monitoring/Power Budgeting Central office Equipment Telecommunication and Datacommunication Equipment PC/Servers GENERAL DESCRIPTION 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. An internal current sense amplifier senses voltage across the sense resistor in the power path via the VCC and SENSE pins. 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. 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. FUNCTIONAL BLOCK DIAGRAM + - SCL I2C 12-Bit ADC ADM1178 V SENSE VCC SDA GND I ADR TIMER FET Drive Controller GATE ON 0 1 + - UV Comparator Current Sense Amplifier Mux 1.3V A ALERTB Alert Figure 1. APPLICATIONS DIAGRAM R SENSE CONTROLLER ADM1178 SENSE Vcc SDA SCL SDA SCL 3.15V - 14V P=VI GND GATE N-Channel FET ON ADR TIMER ALERTB INTERRU PT Figure 2. A 12-bit ADC can measure the current seen in the sense resistor, and also the supply voltage on the VCC pin. 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 is packaged in a 10-lead MSOP package. |
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Mô tả tương tự - ADM1178-1ARMZ-R7 |
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