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LTC2983 problems with interrupt/SDO

Anonymous
Anonymous

    I have a test circuit with the LTC2983CLX. The circuit is build as  in the datasheet (Caps are placed as in the datasheet).

    Grounds and VDD pins all are connected and supplied.

    What I have measured: VDD=5,2V, LDO pin is at 2,5V. Reset input is at 5,2V. The Scope shows stable voltages with a ripple of about 100mV.

     

    BUT:

    - Interrupt output stays at 0,75V (tried with no load and 2k2 pulled to ground) - SDO seems to be in High impedance state.

    I don't know where else to look at...

     

    I have two chips and both have the same behaviour...

    Regards

    Thomas