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Multi-Featured Power Supply Sequencer

UCD90120 12-Channel Sequencer and System Health Monitor - Now Available at Digi-Key

Texas Instruments' UCD90120 Power Supply Sequencer and System Health Monitor surveys and sequences up to 12 independent voltage rails. The device integrates a 12-bit ADC with a 2.5V internal reference for monitoring up to 13 power supply voltage, current, or temperature inputs. The UCD90120 has an I2C/PMBus/SMBus communication interface for pre-production and in-system configuring and monitoring as well as a JTAG port for production programming.     UCD90120 Datasheet
Texas Instruments UCD90120 12-Channel Sequencer and System Health Monitor

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26 GPIO pins can be used for power supply enables, power-on reset signals, external interrupts, cascading multiple UCD90120 devices, or other system functions. 12 of these pins can be used as PWM outputs for power supply margining or general-purpose PWM functions including clock generation for switch-mode power supplies.

The TI Fusion Digital Power Designer is provided for device configuration. This PC-based Graphical User Interface (GUI) offers an intuitive platform for configuring, storing, and monitoring all system operating parameters.

  • Monitor and sequence 12 voltage rails
    • All rails sampled every 200µs
    • 12-bit ADC with 2.5V, 0.5% internal VREF
    • Sequence based on time, rail and pin dependencies
    • Six hardware comparators for power supply fault response in < 80µs
    • Four programmable under-voltage and over-voltage Thresholds per monitor
    • Programmable fault response including retries, shutdown slaves and resequence
  • Non-volatile error logging
    • Stores up to 18 faults
    • Log peak values for all monitor inputs
  • Closed loop margining for 10 rails
    • Margin output adjusts rail voltage to match user-defined margin thresholds
    • Unused margin outputs can be used as GPIOs or general-purpose PWM outputs
  • Watchdog timer and system reset
    • Programmable WDT reset and start times
    • Configurable system reset pulse widths
  • Flexible digital I/O configuration
    • Boolean logic builder for GPO configuration
    • GPIOs can be used as enables, resets, power good and other on-board functions
  • Wide range single supply (3.3V to 12V)
    • Internal temperature sensor
    • 64-Pin QFN package
  • JTAG and I2C/SMBus/PMBus interfaces
  • Fusion digital power GUI for configuring and monitoring device operation

  • Industrial / ATE
  • Telecommunications and networking equipment
  • Servers and storage systems
  • Any system requiring sequencing and monitoring of multiple power rails
RoHS Compliant

Functional Block Diagram

Texas Instruments UCD90120 Diagram

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Texas Instruments
Part Number
Part Number
Voltage - Input
Voltage - Supply
Tape & Reel
0.2V ~ 2.5V
3V ~ 3.6V
Cut Tape