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Texas Instruments UCD9090A Power Supply Sequencer

Texas Instruments UCD9090A Power Supply Sequencer is a 10-rail PMBus/I2C addressable power-supply sequencer and monitor. The device integrates a 12-bit ADC for monitoring up to ten 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 Texas Instruments UCD9090A 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 the use of up to three GPIs to enable and disable any rail. This feature is useful for implementing system low-power modes and the Advanced Configuration and Power Interface (ACPI) specification used for hardware devices.

Features

  • Monitor and sequence ten voltage rails
    • All rails sampled every 400µs
    • 12-bit ADC with 2.5V, 0.5% internal VREF
    • Sequence-based on time, rail, and pin dependencies
    • Four programmable undervoltage and overvoltage thresholds per monitor
  • Non-volatile error and peak-value logging per monitor (up to 26 fault detail entries)
  • Closed-loop margining for ten rails
    • Margin output adjusts rail voltage to match user-defined margin thresholds
  • Programmable watchdog timer and system reset
  • Flexible digital I/O configuration
  • Response and monitor to GPI-triggered fault
  • Easily cascade multiple power sequencers and take coordinated fault responses
  • Pin-selected rail states
  • Cascading multiple devices
  • Multiphase PWM clock generator
    • Clock frequencies from 15.259kHz to 125MHz
    • 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

Typical Applications Circuit

Application Circuit Diagram - Texas Instruments UCD9090A Power Supply Sequencer
Opublikowano: 2017-04-26 | Zaktualizowano: 2022-04-27