TMP513 - OK to ground DXN* pins?

Bob Jewett

Other Parts Discussed in Thread: TMP513, DXP

We have an application that needs a minimum absolute voltage on the DXP pins of the TMP513 due to ESD protection under some conditions. Is it OK to ground the corresponding DXN pin so that the DXP pin will only be +0.8V or so? We have tried this and the preliminary results were bad. The data sheet seems to be silent on the allowed connections. If left without an external DC path, the DXN pins go to about +0.7V and the DXP pins go to about +1.4V. This last voltage is the problem as there is then current through an ESD diode for some chip configurations.

If we can't ground the DXN pins, is there a minimum voltage (say 0.3) that would still allow the TMP513 to work properly?

Thanks,

over 13 years ago

0 Ian Williams over 13 years ago

TI__Mastermind 27715 points

Hello Bob,

The DXN pin can be tied to GND, but the remote diode or transistor must still be wired so that the change in VBE can be measured as the various currents flow from DXP through the remote sensor. This is discussed in another thread viewable at: http://e2e.ti.com/support/other_analog/temperature_sensors/f/243/t/142196.aspx

I've shown the recommended connection below. An NPN transistor is used in this case, but any diode will function as long as the anode (+) is connected to DXP and the cathode (-) is connected to DXN.

Best regards,

Ian Williams
Linear Applications Engineer
Precision Linear and Sensing Products

0 Bob Jewett over 13 years ago in reply to Ian Williams

Prodigy 20 points

Thanks for the response, Ian. We will try to figure out what was wrong with our test.

Best regards,

Bob

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TMP513 - OK to ground DXN* pins?