Dear all,
I am running a bldc motor Infineon TLE9879 chip. Now I want to measure the current flowing through the motor. so I use the current sense amplifier where the motor current is converted to a voltage by means of a shunt resistor RSH(0.005 ohms).
Question: I want to measure current from 0.1amp to 3Amps which gives the voltage drop at RSH (0.1*0.005=0.0005volts to 3*0.005=0.015volts).
Considering 5V reference voltage of ADC I will not be able to get a good number for the above voltage drop. Also with the maximum gain of CSA the output is still negligible. The data sheet says you need to do linear calibration but how to do it for the entire current range?
CSAdatasheet
I am running a bldc motor Infineon TLE9879 chip. Now I want to measure the current flowing through the motor. so I use the current sense amplifier where the motor current is converted to a voltage by means of a shunt resistor RSH(0.005 ohms).
Question: I want to measure current from 0.1amp to 3Amps which gives the voltage drop at RSH (0.1*0.005=0.0005volts to 3*0.005=0.015volts).
Considering 5V reference voltage of ADC I will not be able to get a good number for the above voltage drop. Also with the maximum gain of CSA the output is still negligible. The data sheet says you need to do linear calibration but how to do it for the entire current range?
CSAdatasheet
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