Waterproofing marine equipment - 14 - Final Review

RE: Waterproofing marine equipment - 14 - Final Review

Ofixotech — Fri, 03 Dec 2021 08:10:39 GMT

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RE: Waterproofing marine equipment - 14 - Final Review

hlipka — Fri, 27 Jun 2014 22:56:33 GMT

The bq500212A comes in QFN, so there should be leads on the side of the package (though they are very small). So you could take (or build) a probe with a very fine tip (maybe use a needle) to check if any pads are unconnected during soldering.

Next would be to use a scope to check the power signals (a bad cap on one of them can wreak havoc). Then use it (or a logic probe) to look at the output signals. At least some of them should show some activity, when I look at the data sheet. And lastly compare the levels on the input pins with what should be there, according to the DS (e.g. /RESET should be high).

The trick with debugging is to get as much information as possible, read the documentation as good as possible and then get a mental model of what could be wrong (from the observed behavior vs. expected, with respect to the circuit). These assumptions then can be verified against.

What also might help is to isolate interesting parts of the circuit. Sometimes this allows to find out in what part of the circuit the problem lies.

Another mistake is to use wrong footprints for some components, some come in different versions for the same package. Or rotate a component during soldering (I happened to have done all of this...)

When verifying the schematic, one thing to look out for is signals connected with labels. (Once I searched 3 months for an errors just because I switched SDI and SDO labels on two wires - on one end of the connection they should not have been named as the chip bit swapped).

RE: Waterproofing marine equipment - 14 - Final Review

mcb1 — Fri, 27 Jun 2014 22:43:58 GMT

Eduardo

I think we all learned something from this Challenge, and got caught out by things we thought we had covered.

I hope you are able to sort out the transmitter issue, since I would like to use it to assist a school group.

Wurth were kind enough to send me some Tx and Rx coils to use on it.

While the Road Test might be closing, you could still complete your project in the true spirit of Engineering ("Better late and working than early and faulty")

Mark

RE: Waterproofing marine equipment - 14 - Final Review

DAB — Fri, 27 Jun 2014 19:59:46 GMT

Good job.

You did an amazing amount of work in a very short time.

DAB