circuit stopped working - Electronic Circuits Projects Diagrams Free

electricity86 · 25th December 2008, 06:26 PM

Hello,
I have a chip - CC5461A - which measures voltage and current and transmit these measurements to a microcontroller by a SPI protocol.

The CC5461A is a part of a circuit that operates it (this circuit supplies the voltage and current to be measured, and supplies the voltages the CC5461A needs to operate).

When i built this mentioned circuit with through-hole resistors and capacitors, the chip worked fine,
but when i've built the circuit with SMT components, the chip transmitted the microcontroller wrong results.

i might add that at first i used thinner wires in the SMT circuit, but afterwards i replaced them in thicker wires (the ones i used in the through-hole circuit).

Could you please tell me differences between SMT and through-hole components, in any aspect you could think about? (noise, crosstalk, sensitivity, anything).
This could give me ideas of what changes should i make.

Thanks!

Ubergeek63 · 25th December 2008, 09:58 PM

Size and thermals. And by extension power capacity. More like a miss wire (short or open) than a bad chip.

Dan

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25th December 2008, 06:26 PM	#1
electricity86	circuit stopped working Hello, I have a chip - CC5461A - which measures voltage and current and transmit these measurements to a microcontroller by a SPI protocol. The CC5461A is a part of a circuit that operates it (this circuit supplies the voltage and current to be measured, and supplies the voltages the CC5461A needs to operate). When i built this mentioned circuit with through-hole resistors and capacitors, the chip worked fine, but when i've built the circuit with SMT components, the chip transmitted the microcontroller wrong results. i might add that at first i used thinner wires in the SMT circuit, but afterwards i replaced them in thicker wires (the ones i used in the through-hole circuit). Could you please tell me differences between SMT and through-hole components, in any aspect you could think about? (noise, crosstalk, sensitivity, anything). This could give me ideas of what changes should i make. Thanks!

25th December 2008, 09:58 PM	#2
Ubergeek63	Size and thermals. And by extension power capacity. More like a miss wire (short or open) than a bad chip. Dan Last edited by Ubergeek63; 25th December 2008 at 09:59 PM.