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LDC1051 Transient Sensitivity and Protection

Kris Panaro
Prodigy 40 points
Other Parts Discussed in Thread: LDC1051

Hello,

     I am using the LDC1051 in an application which the circuit board it is mounted to can be disconnected from the system while powered, and re-connected to a hot circuit.  This of course causes potentially harmful transients on the board.  The connector which mates this board and connects the SPI lines from the sensor to an off-board microcontroller has all of its lines protected with TVS diodes and capacitors at the connector.  Unfortunately the LDC1051 can randomly become damaged after "hot plugging" it's circuit board into the system.  The failure mode is a "resistive" short on VDD.

     A few questions:

1.  Are there any pins on the IC that may be more sensitive to transients than others?

2.  Can I ground the No Connect pins?  If not, should they be protected with TVS/capacitor?

3.  Do you have any recommended guidelines for protecting this part from transients?

Thanks,

Kris Panaro

  • 0
    TI__Genius 13650 points
    Hi Kris,
    my suspicion is that any of the abs max ratings in the electrical characteristics are violated while hot-plugging the device. Please use a scope to find out which of the pins violate the abs max ratings.
    Pins 14 and 15 of the LDC1051 are physically not bonded to the die. You may connect them to GND or any other external component.