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ISO1228: ISO1228 FMEA

Mads Hoeffer
Prodigy 50 points

Part Number: ISO1228
Other Parts Discussed in Thread: ISO1211

Hello team,

Im currently working on FMEA of a design using the ISO1228 digital input iC. Do you have FMEA data avaiable for this part? Do you perhaps have FMEA information for supporting components like R_thr, R_par, R_ilim from the example circuit in the datasheet?

 

Looking forward to hearing from you.

 

  • 0
    TI__Mastermind 34555 points

    Hello Mads, 

    We do not have a FMEA for the ISO1228 since there are too many system-level dependencies. The ISO1211 has a concept FMEA document in TIDA-01599 reference design | (STO application) which may be a useful reference.

    The below table may be a helpful guide for the ISO1228 passives when they are either open or short. 

    Resistor

    Sink

    Sink

    Source

    Source

     

    Open

    Short

    Open

    Short

    RSURGE

    No operation (No device damage)

    Normal Operation(No Surge Protection on AVCC)

    No operation (No device damage)

    Regular Operation(No Surge Protection on AVCC)

    RILIM

    No operation (No device damage)

    RILIM = 0Ω is valid operation (IL = 2.5mA)

    No operation (No device damage)

    RILIM = 0Ω is valid operation (IL = 2.5mA)

    RTHR

    Reads input as LOW / 0V

    Device functional with VIH and VIL values specified in datasheet for RTHR = 0Ω

    Reads input as LOW / 0V

    Device functional with VIH and VIL values specified in datasheet for RTHR = 0Ω

    RPAR

    Device functional with no current limit. Not IEC standard Compliant.

    Damage possible device, RTHR or external LED

    Device functional with no current limit. Not IEC standard Compliant.

    Damage possible device, RTHR or external LED

    The current limit can only be set to either 2.5mA or 3.5mA using the suggested resistors.

    Best,
    Andrew