UCD9080 Datasheet, PDF (1/32 Pages) Texas Instruments – 8-CHANNEL POWER SUPPLY SEQUENCER AND MONITOR

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UCD9080
SLVS692A – SEPTEMBER 2006 – REVISED DECEMBER 2006
8-CHANNEL POWER SUPPLY SEQUENCER AND MONITOR
FEATURES
• Single Supply Voltage: 3.3 V
• Low Power Consumption
• Sequences and Monitors up to 8 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 Shutdown 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
DESCRIPTION
The UCD9080 Power Supply Sequencer controls the
enable sequence of up to 8 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 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 shutdown 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
10 kW
3.3 V
0.01 mF
3.3 V
3.3 V
3.3 V
3.3 V
100 kW
10 kW
10 kW
2
To I C
Master Device
A1
2
Slave I C
Address
A2
A3
A4
MON [1:8]
RST
EN [1:7]
XIN
TEST
ROSC
UCD 9080
VCC
SCL
SDA
VSS
EN8/
ADDR1/ ADDR2/ ADDR3/ ADDR4/
GPO1 GPO2 GPO3 GPO4
3.3 V
1 mF
3.3 V
Figure 1. Typical Application Diagram
Power
Supply
EN
1
V_OUT1
Power
Supply
EN
2
V_OUT2
Power
Supply
EN
X
V_OUTX
Digital
Outputs
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
TMS320 is a trademark of Texas Instruments.
Microsoft Windows is a trademark of Microsoft Corporation.
PRODUCT PREVIEW information concerns products in the
formative or design phase of development. Characteristic data and
other specifications are design goals. Texas Instruments reserves
the right to change or discontinue these products without notice.
Copyright © 2006, Texas Instruments Incorporated