描述 Description

The UCD9080 power-supply sequencer controls the enable sequence of up to eight independent voltage rails and provides four general-purpose digital outputs. The device operates from a 3.3-V supply, provides 3.2-mV resolution of voltage rails, and requires no external memory or clock. The UCD9080 monitors the voltage rails independently at more than a 20-kHz rate and has a high degree of rail sequence and rail error-response configurability. The sequencing of rails can be based on timed events or on timed events in conjunction with other rails achieving regulation or a voltage threshold. In addition, each rail is monitored for undervoltage and overvoltage glitches and thresholds. Each rail the UCD9080 monitors can be configured to shut down a user-defined set of other rails, and alarm conditions are monitored on a per-rail basis. Figure 1 shows the UCD9080 power-supply sequencer in a typical application.

特性 Features

? Single Supply Voltage: 3.3 V
? Low Power Consumption
? Sequences and Monitors up to Eight Voltage Rails
? Rail Voltages Sampled Every 50 μs With 3.2-mV Resolution
? Four Configurable Digital Outputs for Power-On Reset and Other Functions
? Configurable Rail-Enable Output Polarity
? Flexible Rail Sequencing: Timeline (ms), Parent Rail Regulation Window, Parent Rail Achieving Defined Threshold
? Under- and Overvoltage Thresholds: Settable Per-Rail
? Regulation Expiration Time: Settable Per-Rail
? Flexible Rail Shutdown: Parent Rail Shutdown Can Shut Down Child Rails, Independent Rail Configuration
? Per-Rail Alarm Conditions, With Timestamp: Under- and Overvoltage Glitch, Sustained Under- and/or Overvoltage, Rail Did Not Start
? I2C Interface for Configuration and Monitoring
? Microsoft? Windows? GUI for Configuration and Monitoring
? APPLICATIONS
? Telecommunications Switches
? Servers
? Networking Equipment
? Test Equipment
? Any System Requiring Sequencing of Multiple Voltage Rails

TMS320 is a trademark of Texas Instruments. Microsoft, Windows are trademarks of Microsoft Corporation. All other trademarks are the property of their respective owners.