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12 Power Supply Sequencer and Monitor

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12 Power Supply Sequencer and Monitor

12 Power Supply Sequencer and Monitor

The UCD90124A is a 12-rail PMBus/I2C addressable power-supply sequencer and 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 UCD90124A offers support for fan control, 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.

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

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