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
Approx. Price (US$)
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   
3.60 | 1ku    4.95 | 1ku    6.45 | 1ku    5.65 | 1ku    5.90 | 1ku   

Other qualified versions of UCD9090

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