AD7896: BUSY indicator staying High

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Accepted Answer

Question The BUSY indicator is staying High. What should I do? Answer CORRECT POWER UP SEQUENCE:
 It is essential that all inputs to the AD7895 must remain below the VDD supply, 
 otherwise internal esd diodes will switch on and unless the current is limited 
 permanent damage may be caused to the AD789. During power-up, you should ensure 
 that the digital inputs are not floating and the analog input is within VDD. 
 Using a pull down resistor(or a pull-up resistor to VDD)during the power up 
 phase will ensure this is the case.
 The correct power up sequence is as follows: Vdd – Analog inputs – Digital 
 inputs - Digital outputs.
 
 CORRECT TIMING OF /COMVST, SCLK
 This has been the cause of some customers having what appears to be a ‘latch-
 up’. Either the /CONVST is incorrect or the timing in general is an issue.

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AD7896: FAQ