Hello,
Our customer uses the DRV8885, has some questions about Current Control.
1) about VRREF specification
It is mentioned RREF=18k ohm to 132k ohm in the TEST CONDITIONS.
Is that range the limit of operation?
Or, that range is just TEST CONDITION, so it is possible to use
a resistor out of range value.
(Of course the VRREF value is out of Spec.)
2) about current accuracy
It is mentioned '+/-6.25% Full-Scale Current Accuracy' at Features.
The customer control the current by using a DAC. So,the customer refer to
the Equation(2) on the datasheet. It is added VRREF term.
Does the accuracy of +/-6.25% include the VRREF variation?
Is it go worse accuracy?
Regards,
Naoki Aoyama







