LM3814-1.0

The LM3814-1.0 Current Gauges provide easy to use precision current measurement with virtually zero insertion loss (typically 0.004W). The LM3814-1.0 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 averaging function. Current is averaged over 6 msec time periods in order to provide immunity to current spikes.

The LM3814-1.0 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 current options.

The sense range of LM3814-1.0 is −1A to +1A or −7A to +7A. The user specifies a particular part number to match the current 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.