CC3220: cc3220sf DCDC stepup low voltage and no start.

Hi Shamil,

How are you powering the PCB? What voltage are you supplying to it?
If you are using a battery, did you place extra decoupling capacitors?

What do you mean that the same chip works on dev plate?
- do you mean physically soldering the chip onto a launchpad and it works?



Regards,
Toby

now 3.3v from lab power block.

i have placed extra decoupling capacitors (2x 100uF)

>>- do you mean physically soldering the chip onto a launchpad and it works?

yes. work in your plate and not in mine.

i have 7 chips and soldered one in my plate - problem not in chip.

Hmm ok, it must be issue in layout then.

Can you confirm that the chip is in the correct orientation?

Since I currently don't have Altium installed, please send me pictures of relevant regions in PCB.

To further aid analysis, please let me know the voltage measurements on the power pins:
9, 10, 24, 25, 33, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 54

>>Can you confirm that the chip is in the correct orientation?

Confirm! Orientation is coorect.

>> 9, 10, 24, 25, 33, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 54
give me a little time...

ok, first of all I have soldered more thicker wire from 25 36 and 48 pins to capacitors (see pic)

and after that i power it  from 3.3v lab powerblock

current is 50mA

pin: volt

9:  1.2

10: 3.1

24: 0

25: 1.9

32: 3.1

33: 0

34: 0

36: 1.9

37: 3.1

38: 1.9

39: 3.1

40: 0

41: 0

42: 0

43: 1.2

44: 3.1

45: 0

46: 0

47: 3.1

48: 1.9

49: 1.2

54: 3.1

56: 1.2

p.s. have TI russian employers?

Thread UP!

please help!

Seems like you are now able to get 1.9 V on pin 48 (you said it was 0.6 before). The pins left we must consider are:
24, 33, 40, 41, 42, 45, and 46, since the voltage on these I observed as follows:
24: 1.4 V
33: 1.86 V
40: 1.86 V
41: 1.86 V
42: 1.86 V
46: 1.61 V

>> Seems like you are now able to get 1.9 V

yes it is! BUT! 1.9v are at dev plate to. I think my tester show 1.85 not  correct. i'll check by another tester at monday, i hope.

>> 24, 33, 40, 41, 42, 45, and 46, since the voltage on these I observed as follows:

they must be V as you wrote?

and i am going to check dev plate to. and merge V from dev plate and mine.

...waiting Monday...