Hi all
I’m working with the demo software provided by Freescale for RD9Z1-638-4Li-SW. I’m finding it when I reading the current measurement register (ACQ_CURR) there always something wrong (I think).Because when there is no load (only the board) I also see the current result is almost 200mA(the board consume is probably 20mA).
Thanks for all answer!!!
Hello!
I am using the MM912_637, but I am experiencing the same problem.. I always see an offset of around 150mA when comparing to the current value on the multimeter.
I am doing the calibration procedure and I am not being able to fix it. Does anyone could help me?
Maybe I am using the wrong configuration for the current ACD or doing the wrong procedure for the calibration.
Thank you,
Marina
Hi Marina,
can you provide more details on your setup (schematics, where do you apply what, etc..)?
W.
This is my setup:
Marina, is the Chassis side floating? How does the current reading look like if you short Chassis to Battery Minus?
Hi,
I am just adding here Wolfgang’s answer to keep this thread consistent:
Depending on your setup you should see either ~0mA or ~35mA (typical current consumption of the board - no balancing, no additional loads).
Items to check:
The Ah counter basically sums up all CSENSE measurements: AHC = SUM(CURR).
I expect in your setup the CSENSE is continuous running at 1KHz data rate. Which for 1 minute would be 60000 samples which are accumulated. So the average current Iaverage = SUM(CURR) / number_of_samples = 7690884/60000 = 128mA
Regards,
Tomas
HI ,
i use my board to measure voltage and current,but its value are increase all the time.Is there something wrong with my schematic or my program(KT9Z1_638_CAN_demo).
Thank you.
Best regards,
H YW
Hi,
You state that the 0xFFFF94 is right, why?
You measured:
With Iload = 0A, we can see that the Isup is about 30 mA (delta between both) and that we have a offset error of ~100mA. What values did you have on the Shunt sticker?
Did you measure Isup with an ext. Multimeter?