• Monitor and Sequence 12 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 12 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
• 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

• Industrial / ATE
• Telecommunications and Networking Equipment
• Servers and Storage Systems
• Any System Requiring Sequencing and Monitoring of Multiple Power Rails

The UCD90120A is a 12-rail PMBus/I2C addressable power-supply sequencerand monitor.The device integrates a 12-bit ADC for monitoring up to 12 power-supply voltage inputs.Twenty-six GPIO pins can be used for power supply enables, power-on reset signals, external interrupts, cascading, or other system functions. Twelve of these pins offer PWM functionality.Using these pins, the UCD90120A 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.