32-Rail PMBus Power Sequencer and System Manager



The UCD90320 device is a 32-rail PMBus addressable power sequencer and system manager in a compact 0.8-mm pitch BGA package.

The 24 integrated ADC channels (AMONx) monitor the power supply voltage, current, and temperature. Eighty-four GPIO pins can be used for 8 digital monitor (DMONx), 32 power supply enable (ENx), 24 margining (MARx), 16 Logical GPO, 32 GPI, cascading, and system function.

The 32 ENx pins and the 16 LGPOx pins can be configured to be active driven or open drain outputs.

Nonvolatile event logging preserves fault events after power dropout. Black box fault log feature preserves the status for all rails and I/O pins when the first fault occurs. The cascading feature offers convenient ways to manage up to 128 voltage rails through one SYNC_CLK pin connection. Fault pin feature coordinates among cascaded devices to take synchronized fault responses. The pin-selected rail states feature employs up to 3 GPIs to control up to eight user-defined power states. These states can implement system low-power modes as outlined in the (ACPI) specification.

For all available packages, see the orderable addendum at the


  • Sequence, Monitor, and Margin 24 Voltage Rails Plus 8 Digital Rails
  • Monitor and Respond to OV, UV, OC, UC, Temperature, Time-Out, and GPI-Triggered Faults
  • Flexible Sequence-On and Off Dependencies, Delay Time, Boolean Logic, and GPIO Configuration to Support Complex Sequencing Applications
  • 4 Rail Profiles for Adaptive Voltage Identification (AVID) Voltage Regulator
  • High-Accuracy Closed-Loop Margining
  • Active Trim Function Improves Rail Output Voltage Accuracy
  • Advanced Nonvolatile Event Logging To Assist System Debugging
    • Single-Event Fault Log (100 entries)
    • Peak Value Log
    • Black Box Fault Log to Save Status of All Rails and I/O Pins at the First Fault
  • Easily Cascade Up to 4 Power Sequencers and Take Coordinated Fault Responses
  • Programmable Watchdog Timer and System Reset
  • Pin-Selected Rail State
  • PMBus 1.2 Compliant

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Parametrics Compare all products in Sequencer

# of Supplies Monitored
VCC (Min) (V)
VCC (Max) (V)
Iq (Typ) (uA)
Time Delay (ms)
# of Sequenced Outputs
UCD90320 UCD90120A UCD90124A UCD90160A UCD90240 UCD9090A UCD90910
32    13    12    16    24    11    10   
3.15    3    3    3    3.15    3    3   
3.63    3.6    3.6    3.6    3.63    3.6    3.6   
31400    50000    50000    50000    31400    50000    50000   
Programmable    Programmable    Programmable    Programmable    Programmable    Programmable    Programmable   
32    12    12    16    24    10    10   
Catalog    Catalog    Catalog    Catalog    Catalog    Catalog    Catalog   
169NFBGA    64VQFN    64VQFN    64VQFN    157BGA MICROSTAR JUNIOR    48VQFN    64VQFN   

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