Features: · No external sense element required· PWM output indicates the current magnitude and direction· PWM output can be interfaced with microprocessors· Precision DS current-sense technique· Low temperature sensitivity· Internal filtering rejects false trips· Internal Power-On-Reset (POR)Appli...
LM3814: Features: · No external sense element required· PWM output indicates the current magnitude and direction· PWM output can be interfaced with microprocessors· Precision DS current-sense technique· Low...
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· No external sense element required
· PWM output indicates the current magnitude and direction
· PWM output can be interfaced with microprocessors
· Precision DS current-sense technique
· Low temperature sensitivity
· Internal filtering rejects false trips
· Internal Power-On-Reset (POR)
· Battery charge/discharge gauge
· Motion control diagnostics
· Power supply load monitoring and management
· Resettable smart fuse
Sense Current Range (+/-) | 1, 7 Amp |
Sense Element Resistance | 0.004 Ohm |
Sense Accuracy | 6, 3.5 % |
Sensing Type | High side |
Sampling Interval | 0.006 sec |
Input Min Voltage | 2 Volt |
Input Max Voltage | 5.25 Volt |
Iq in Shutdown (typ) | 0.0025 mA |
Switching Frequency | 0.160 kHz |
Watchdog | No |
On/Off Pin | Yes |
Temperature Min | -40 deg C |
Temperature Max | 125 deg C |
RegType | Current Gauge |
View Using Catalog |
The LM3814/LM3815 Current Gauges provide easy to use precision current measurement with virtually zero insertion
loss (typically 0.004W). 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 averaging function. Current is averaged over 6 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 LM3814 and LM3815 are factory-set in two different current ptions. The sense range 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.