10-Channel Sequencer and System Health Monitor - UCD9090


10-Channel Sequencer and System Health Monitor


The most current UCD90xxx PMBus™ Command Reference is available at http://www.ti.com/fusiondocs


The UCD9090 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 UCD9090 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 provides device configuration. This PC-based user interface (UI) 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 30 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
  • Pin-Selected Rail States
  • Cascading Multiple Devices
  • Multi-phase 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

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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
UCD9090 UCD90120A UCD90124A UCD90160 UCD90910
11    13    12    16    10   
3    3    3    3    3   
3.6    3.6    3.6    3.6    3.6   
50000    50000    50000    50000    50000   
Programmable    Programmable    Programmable    Programmable    Programmable   
10    12    12    16    10   
Catalog    Catalog    Catalog    Catalog    Catalog   
48VQFN    64VQFN    64VQFN    64VQFN    64VQFN   

Other qualified versions of UCD9090

Version Part Number Definition
Automotive UCD9090-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects