Part Number: INA3221
Tool/software:
Hi team,
The customer wants to detect 6 groups of current on the board.
Use two INA3221s, both power supply voltages are +12V
Have the following questions
1. Does INA3221 need to write a default code?
2. What is the current resolution? Is this set using config?
The customer reference circuit is the VGA Team using a 5m ohm shunt resistor
Thanks!
Best regards,
Alice Fan
Hello Alice,
Here are my responses to your questions:
1. The INA3221 will operate without writing any default codes, since it does have default settings. However, it is likely that you will want different settings than the default, in which case you will want to right those to the device after power-up.
2. The shunt voltage LSB step size is 40µV:
So, your current LSB would be obtained from I=V/R. However, there will be a difference in "resolution" based on the conversion and averaging settings you choose (in the config register):
Regards,
Mitch
Hi Mitch,
If the shunt load is 1A and the reading is 5mV,
Then 14-3 bit is 5mV/40uV=125,
125 converted to binary is 0000 0111 1101
Reading bit14-3 on the EC side of the board will give 1A = 0000 0111 1101?
Thanks!
Best regards,
Alice Fan
