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So small a resistor between core supply voltage pin and GND!
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shishiker



Joined: 21 Jul 2004
Posts: 11
Post15 Oct 2005 9:39   

So small a resistor between core supply voltage pin and GND!
hello!
I have a dsp system in my circuit
When I check whether tms320c6713's core supply voltage(CVDD) pin is short to GND with multimeter, I find that the equivalent resistor between them is just 39 ohm or 42 ohm. I have just solder DSP and the power manager TPS54312.

So small a resister between core supply voltage pin and GND, is it correct?

Thanks!
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IanP



Joined: 05 Oct 2004
Posts: 6492
Helped: 1542
Location: West Coast
Post15 Oct 2005 10:24   

Re: So small a resistor between core supply voltage pin and
Measuring Vcc/Vdd against GND with a multimiter can produce some "funny" readings ..
At this stage I wouldn't worry about these figures ..
Different story would be if you read resitances close to 0Ω or infinity (nothing at all).
If you have tantalum/electolytic capacitors in this circuit double-check their polarities ..

Regards,
IanP
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shishiker



Joined: 21 Jul 2004
Posts: 11
Post15 Oct 2005 14:50   

Re: So small a resistor between core supply voltage pin and
I see

Thanks!
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shishiker



Joined: 21 Jul 2004
Posts: 11
Post16 Oct 2005 7:33   

Re: So small a resistor between core supply voltage pin and
Hello, IanP

Then I have another question
Now I have soldered DSP, FPGA and their power supply managers.
The total current consumed is 104mA, is it correct?

Sometime I've check other one's DSP+FPGA system, the current is just about 20mA when no program running.

Why this current is so high?
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echo47



Joined: 07 Apr 2002
Posts: 4206
Helped: 566
Post16 Oct 2005 9:20   

So small a resistor between core supply voltage pin and GND!
104mA may be normal. Refer to the data sheets of all your chips to find their typical current in "standby" state, or whatever state you are running them right now. Don't forget to include terminator resistors or other passive devices that eat power. Add up the numbers to see if it's close to 104mA.
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