Dunno if there's something in your design that prevents it, but especially if you have a free ADC channel, you could just build one up from a handful of parts.
For a high side current amp, you just need a shunt, an opamp or two, and some resistors. You can scale the gain of the amplifiers to your expected sensing range (if your max is 1A and your shunt is 100mOhm, then a gain of 50 in the amplifiers would get that to 0-5V), and then you can make maximum use of your ADC's resolution, this would give you 1024 divisions of 1A with a basic 10 bit ADC.
Now that option won't be as well characterized as an integrated solution, and unless you're willing to do the testing and compensation yourself, it will be more susceptible to errors from temperature, ADC reference fluctuation, etc. than a single chip... but you can get basically any range you want (within reason and without a need for isolation) with less than 50 cents of parts in one off quantities if you've got an ADC channel open.
Home
Help
Search
Login
Register
