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Frequent questions

  • [FAQ] Why does the GPI not turn off the rails when it is de-asserted if the GPI is configured as a rail's sequence-off dependency? UCD90xxx

    Other Parts Discussed in Thread: UCD90120A , UCD9090 , UCD90160A , UCD90240 , UCD90320U , UCD90120 , UCD9090A , UCD90160 , UCD90124 , UCD90320 , UCD90124A Each rail has its own ON/OFF Config setting. In the setting, there are three sources that can control…

  • [FAQ] Is packet error code required by the PMBus master? UCD90xxx

    Other Parts Discussed in Thread: UCD90120A , UCD9090 , UCD90160A , UCD90160 , UCD90320U , UCD90120 , UCD9090A , UCD90124 , UCD90124A , UCD90320 It is optional. UCD90xxx devices send and receive a packet error code (PEC) if the PMBus host supports it.…

  • [FAQ] Is clock stretching required by the PMBus master? UCD90xxx

    Other Parts Discussed in Thread: UCD90120A , UCD9090 , UCD90160A , UCD90160 , UCD90320U , UCD90120 , UCD9090A , UCD90124 , UCD90124A , UCD90320 Yes. UCD90xxx devices may hold clock low while processing the PMBus inquiry. According to PMBus specifications…

  • [FAQ] TPSM84824: How to calculate FIT rate for this module?

    Part Number: TPSM84824 For modules, the FIT is calculated differently. This is a module assembly made of up individual components (unlike solid state silicon). As such this reliability prediction is based on TR-NWT-332 Reliability prediction model that…

  • [FAQ] TPSM846C24: How to calculate the FIT rate for this module?

    Part Number: TPSM846C24 For modules, the FIT is calculated differently. This is a module assembly made of up individual components (unlike solid state silicon). As such this reliability prediction is based on TR-NWT-332 Reliability prediction model…

  • [FAQ] Why are there no undervoltage faults? For some reason, the rails do not start. UCD90xxx

    Other Parts Discussed in Thread: UCD90120A , UCD9090 , UCD90160A , UCD90160 , UCD90320U , UCD90120 , UCD9090A , UCD90124 , UCD90124A , UCD90320 The UCD90xxx only starts to monitor undervoltage (UV) faults after the rail voltage reaches the Power Good…

  • [FAQ] Why do the rails not start or stop? UCD90xxx

    Other Parts Discussed in Thread: UCD90120A , UCD9090 , UCD90160A , UCD90160 , UCD90320U , UCD90120 , UCD9090A , UCD90124 , UCD90124A , UCD90320 First, check if the EN pin output from the UCD90xxx is at the correct state. If not, it means the On/Off Config…

  • [FAQ] How do users know that the sequencing dependencies are met? UCD90xxx

    Other Parts Discussed in Thread: UCD90320U , UCD90320 , UCD9090A , UCD90160A , UCD90120A , UCD9090 , UCD90160 , UCD90120 , UCD90124 , UCD90124A UCD90xxx devices support three different events as dependencies: Rail, GPI, and LGPO (UCD9090A, UCD90160A,…

  • [FAQ] How many rails can each UCD90xxx device support?

    Other Parts Discussed in Thread: UCD9090A , UCD9090 , UCD90120A , UCD90120 , UCD90124A , UCD90124 , UCD90160A , UCD90160 , UCD90320 , UCD90320U The number of supported rails vary depending on the device. Be aware that some UCD90xxx devices have more MON…

  • [FAQ] Can the GUI generate a data flash image file (.hex) offline? UCD90xxx

    Other Parts Discussed in Thread: UCD90120A , UCD9090 , UCD90160A , UCD90160 , UCD90240 , UCD90320U , UCD90120 , UCD9090A , UCD90124 , UCD90124A , UCD90320 No. A data flash image file can only be generated from a live device or a data flash script file…

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