The ISENSE value on FRDMC33771CSPEVB is zero

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The ISENSE value on FRDMC33771CSPEVB is zero

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Zyuan17
Contributor III

I connected a shunt resistor in parallel with the X2 port. And the voltage across the shunt resistor is 11.8mV. (Measured from the multimeter) But when I connected to the board. The measurement value of ISENSE is zero, but other values are correct. I connected the X2 in parallel with the shunt resistor. The value of the shunt resistor is 0.289ohm and the current is 0.048A. Below are my codes. And I also use the GUI, the result on the GUI is still 0.000mV. 

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JozefKozon
NXP TechSupport
NXP TechSupport

Hi Zhe,

the printscreens are from the MC33771C datasheet. You can download it from this link, under the secure files.

JozefKozon_3-1669192985552.png

You need to be registered on the page and you need to have a valid NDA (Non Disclosure Agreement) with NXP. If you haven't signed the NDA yet and you would like to sign it, please create a new ticket here and an NXP representative for NDA matters will help you with the process.

JozefKozon_4-1669193267030.png

With Best Regards,

Jozef

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JozefKozon
NXP TechSupport
NXP TechSupport

Dear Zhe,

by default the current measurement is disabled. Please enable it by setting the IMeasEn bit in SYS_CFG1 register.  

JozefKozon_0-1669108129991.png

Please follow the steps in the this link

With Best Regards,

Jozef

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Zyuan17
Contributor III
Hi Jozef, if I want to use the current measurement in my codes, what should I do? Is there any APIs that is used to enable the current measurement?
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JozefKozon
NXP TechSupport
NXP TechSupport

Hi Zhe,

unfortunately no, we do not have any API for this, but to enable the current measurement in the code, you need to set the I_MEAS_EN bit in the SYS_CFG1 register.

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With Best Regards,

Jozef

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788 Views
Zyuan17
Contributor III
Could you send me the link to this document? I can't find this document.
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779 Views
JozefKozon
NXP TechSupport
NXP TechSupport

Hi Zhe,

the printscreens are from the MC33771C datasheet. You can download it from this link, under the secure files.

JozefKozon_3-1669192985552.png

You need to be registered on the page and you need to have a valid NDA (Non Disclosure Agreement) with NXP. If you haven't signed the NDA yet and you would like to sign it, please create a new ticket here and an NXP representative for NDA matters will help you with the process.

JozefKozon_4-1669193267030.png

With Best Regards,

Jozef

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