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ADM1175-1ARMZ-R7 Datenblatt(PDF) 1 Page - Analog Devices |
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ADM1175-1ARMZ-R7 Datenblatt(HTML) 1 Page - Analog Devices |
1 / 24 page Hot Swap Controller and Digital Power Monitor with Convert Pin ADM1175 Rev. 0 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 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 and active-low ON/ONB pin options Convert start pin (CONV) I2C® fast mode-compliant interface (400 kHz maximum) 10-lead MSOP APPLICATIONS Power monitoring/power budgeting Central office equipment Telecommunication and data communication equipment PCs/servers GENERAL DESCRIPTION The ADM1175 is an integrated hot swap controller and current sense amplifier 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 ADM1175 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 ADM1175 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 ADM1175-1 SENSE ON VCC CONV 1.3V MUX I2C 12-BIT ADC FET DRIVE CONTROLLER GND CURRENT SENSE AMPLIFIER UV COMPARATOR A SDA SCL ADR GATE TIMER Figure 1. RSENSE N-CHANNEL FET P = VI CONTROLLER ADM1175-1 SENSE VCC SDA SCL SDA SCL GND GATE CONV CONV ADR 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 or via the convert (CONV) pin. The CONV pin is especially useful for synchronizing reads on multiple ADM1175 devices. Alternatively, the ADC can run continuously, and the user can read the latest conversion data whenever it is required. Up to four unique I2C addresses can be created, depending on the way the ADR pin is connected. The ADM1175 is packaged in a 10-lead MSOP. |
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