10-Rail Power Supply Sequencer and Monitor With ACPI Support

10-Rail Power Supply Sequencer and Monitor With ACPI Support  - UCD9090A


The UCD9090A is a 10-rail PMBus/I2C addressable power supply sequencer and monitor. The device integrates a 12-bit ADC for monitoring up to 10 power supply voltage inputs. Twenty-three GPIO pins can be used for power supply enables, power-on reset signals, external interrupts, cascading, or other system functions. Ten of these pins offer PWM functionality. Using these pins, the UCD9090A offers support for margining, and general-purpose PWM functions.

Specific power states can be achieved using the Pin-Selected Rail States feature. This feature allows with the use of up to 3 GPIs to enable and disable any rail. This is useful for implementing system low-power modes and the Advanced Configuration and Power Interface (ACPI) specification that is used for hardware devices.

The TI Fusion Digital Power™ designer software is provided for device configuration. This PC-based graphical user interface (GUI) offers an intuitive interface for configuring, storing, and monitoring all system operating parameters.


  • Monitor and Sequence 10 Voltage Rails
    • All Rails Sampled Every 400 µs
    • 12-bit ADC with 2.5-V, 0.5% Internal VREF
    • Sequence Based on Time, Rail and Pin Dependencies
    • Four Programmable Undervoltage and Overvoltage Thresholds per Monitor
  • Nonvolatile Error and Peak-Value Logging per Monitor (up to 26 Fault Detail Entries)
  • Closed-Loop Margining for 10 Rails
    • Margin Output Adjusts Rail Voltage to Match User-Defined Margin Thresholds
  • Programmable Watchdog Timer and System Reset
  • Flexible Digital I/O Configuration
  • Response and Monitor to GPI-Triggered Fault
  • Easily Cascade multiple Power Sequencers and Take Coordinated Fault Responses
  • Pin-Selected Rail States
  • Cascading Multiple Devices
  • Multiphase PWM Clock Generator
    • Clock Frequencies From 15.259 kHz to
      125 MHz
    • Capability to Configure Independent Clock Outputs for Synchronizing Switch-Mode Power Supplies
  • JTAG and I2C/SMBus/PMBus™ Interfaces

View more

Parametrics Compare all products in Sequencer

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

Featured tools and software