AN841 Datasheet, PDF (2/4 Pages) Silicon Laboratories – THE MICROCC—A MICROAMP-RANGE CONSTANT-CURRENT SOURCE

AN841
Figure 2. MicroCC Circuit Schematic
Initial testing confirms total supply current draw (power consumption) is less than 0.3mA, allowing a single CR2032
battery to last up to 600 hours. While testing, one of our multimeters was discovered to produce a large amount of
noise when on the µA setting and we are looking into this.
Calibration is unnecessary as there is no part to calibrate; however, it is suggested that it be powered on for a few
minutes to allow the circuit to stabilize before attaching a load.
There was an error with the identification and license not being on the correct layer, and is missing from the
prototype batch of PCBs. This may not make it to production, but there are plans to improve the range and overall
accuracy. Overall, the MicroCC performs better than expected, and any improvements would include adding a
precision analog microcontroller and the ability to go all the way down to null current.
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Rev. 1.0