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ADM1176-1ARMZ-R7 Datenblatt(PDF) 1 Page - Analog Devices |
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ADM1176-1ARMZ-R7 Datenblatt(HTML) 1 Page - Analog Devices |
1 / 24 page Hot Swap Controller and I2C® Power Monitor with Convert Pin ADM1176 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other 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 to 16.5 V Precision current sense amplifier Precision voltage input 12-bit ADC for current and voltage readback Charge pumped gate drive for external N-channel FET Adjustable analog current limit with circuit breaker ±3% accurate hot swap current limit level 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 I2C® fast mode-compliant interface (400 kHz maximum) Two address pins allow 16 devices on the same bus 10-lead MSOP APPLICATIONS Power monitoring/power budgeting Central office equipment Telecommunication and data communication equipment PCs/servers GENERAL DESCRIPTION The ADM1176 is an integrated hot swap controller that offers digital current and voltage monitoring via an on-chip, 12-bit analog-to-digital converter (ADC), communicated through an I2C interface. An internal current sense amplifier senses voltage across the sense resistor in the power path via the VCC pin and the SENSE pin. The ADM1176 limits the current through this resistor by control- ling the gate voltage of an external N-channel FET in the power path, via the GATE pin. The sense voltage (and, therefore, the inrush current) is kept below a preset maximum. The ADM1176 protects the external FET by limiting the time that it spends with maximum current running through 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 that may occur once the hot swap event is complete. In the case of a short-circuit event, the current in the sense resistor exceeds an overcurrent trip threshold, and the FET is switched off immediately by pulling down the GATE pin. FUNCTIONAL BLOCK DIAGRAM V I 0 1 ADM1176 SENSE ON VCC 1.3V MUX I2C 12-BIT ADC FET DRIVE CONTROLLER GND CURRENT SENSE AMPLIFIER UV COMPARATOR A SDA SCL A1 A0 GATE TIMER Figure 1. RSENSE N-CHANNEL FET P = VI CONTROLLER ADM1176 SENSE VCC SDA SCL SDA SCL GND GATE A0 A1 TIMER 3.15V TO 16.5V ON Figure 2. Applications Diagram A 12-bit ADC can measure the current seen in the sense resistor, as well as 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 16 unique I2C addresses can be created, depending on the way the A0 and A1 pins are connected. The ADM1176 is packaged in a 10-lead MSOP. |
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