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LM3814MX-1.0 Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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LM3814MX-1.0 Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
1 / 14 page LM3814/LM3815 Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output General Description The LM3814/LM3815 Current Gauges provide easy to use precision current measurement with virtually zero insertion loss (typically 0.004 Ω). The LM3814 is used for high-side sensing and the LM3815 is used for low-side sensing. A Delta Sigma analog to digital converter is incorporated to precisely measure the current and to provide a current aver- aging function. Current is averaged over 6 msec time peri- ods in order to provide immunity to current spikes. The ICs have a pulse-width modulated (PWM) output which indicates the current magnitude and direction. The shutdown pin can be used to inhibit false triggering during start-up, or to enter a low quiescent current mode. The LM3814 and LM3815 are factory-set in two different cur- rent options. The sense range is −1A to +1A or −7A to +7A. The user specifies a particular part number to match the cur- rent range for a given application. The sampling interval for these parts is 6ms. If larger sampling interval is desired for better accuracy, please refer to the data sheets for the part numbers LM3812 and LM3813. Key Specifications n Ultra low insertion loss (typically 0.004 Ω) n 2V to 5.25V supply range n ±3.5% accuracy at room temperature (includes accuracy of the internal sense element) (LM3814-1.0, LM3815-1.0) n Low quiescent current in shutdown mode (typically 2.5 µA) n 6 msec sampling interval Features n No external sense element required n PWM output indicates the current magnitude and direction n PWM output can be interfaced with microprocessors n Precision ∆Σ current-sense technique n Low temperature sensitivity n Internal filtering rejects false trips n Internal Power-On-Reset (POR) Applications n Battery charge/discharge gauge n Motion control diagnostics n Power supply load monitoring and management n Resettable smart fuse Connection Diagrams DS101013-1 Top View LM3814 for High-Side Sensing DS101013-3 Top View LM3815 for Low-Side Sensing January 1999 © 1999 National Semiconductor Corporation DS101013 www.national.com |
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