Features: No external sense element requiredPWM output indicates the current magnitude and directionPWM output can be interfaced with microprocessors Precision DS current-sense technique Low temperature sensitivityInternal filtering rejects false tripsInternal Power-On-Reset (POR)Application Batte...
LM3813-1.0: Features: No external sense element requiredPWM output indicates the current magnitude and directionPWM output can be interfaced with microprocessors Precision DS current-sense technique Low tempera...
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Absolute Maximum Supply Voltage Power Dissipation ESD Susceptibility (Note 3) Sense Current (peak, for 200 msec) (Note 4) Sink Current for PWM pin Voltage on Pin 5 Maximum Junction Temperature Storage Temperature Lead Temperature (Soldering, 10 sec) |
5.5V Note 2) 1.5 kV 10A 1mA 5.25V 150°C −65°C to +150°C 260°C |
The LM3813-1.0 Current Gauges provide easy to use precision current measurement with virtually zero insertion loss (typically 0.004W). The LM3812 is used for high-side sensing and the LM3813 is used for low-side sensing. A Delta Sigma analog to digital converter is incorporated precisely measure the current and to provide a current averaging function.
Current is averaged over 50 msec time periods 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 LM3813-1.0 and LM3813 are factory-set in two different current options. The sense range is −1A to +1A or −7A to +7A. The sampling interval for these parts is 50ms. If faster sampling is desired, please refer to the data sheets for the part numbers LM3814 and LM3815.