Dear Support Team,
I’m going to practice with the MCT8315Z0HRRYRCT motor driver. However, I encountered problems when soldering two chips (QFL package) on breakout boards. I’d like to know if I soldered the chips successfully before populating these boards. The absence of bridges doesn’t guarantee that all pins are properly soldered to the footprint. If I understand correctly, in the case of using a 12V DC power supply, an AVDD should show 3.3V. Unfortunately, the AVDD voltage on both of my chips is about 0.4V.
Here are my questions:
- Should I use pull-up resistors for some hardware pins or connect the PWM pin to a signal generator to start the AVDD generation?
- Are there some ways of testing the chip on a breakout board?
Thank you,
Anatoliy
Checking one this one. Will let you know when I have an answer.
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Thank you! Wil be waiting for your answer.
Anatoliy
Sorry for the delay on this one. Still waiting on an answer.
Hello @geometer,
Apologies for the delay as you question fell through the cracks.
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Yes, soldering is challenging with the MCT8315Z0HRRYRCT WQFN package. It’s even harder when we consider the unobservable central heat sink and necessity of a good thermal bond. For hand assembly, I recommend a stencil. This will simplify the solder paste application as you will just enough in the correct spot. On the other hand, you may be able to learn hand solder techniques from masters such as NorthridgeFix
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Yes, AVDD is the “3.3-V internal regulator output”. This appears to be an essential section providing power to select logic circuitry including the Hall sensors. The regulator appears to run constantly - please verify my data sheet interpretation. Consequently, something is wrong with your board.
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TI offers an evaluation board. The MIKROE-5644 is a closely related breakout board featuring the related TI MCT8316A.
Happy soldering,
APDahlen
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