UCD9080_16 Datasheet, PDF (1/38 Pages) Texas Instruments – 8-CHANNEL POWER-SUPPLY SEQUENCER AND MONITOR

UCD9080
www.ti.com................................................................................................................................................... SLVS692E – SEPTEMBER 2006 – REVISED MAY 2008
8-CHANNEL POWER-SUPPLY SEQUENCER AND MONITOR
FEATURES
1
•234 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
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 time or on time
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.
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
1
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.
2
Microsoft, Windows are registered trademarks of Microsoft Corporation.
3
All other trademarks are the property of their respective owners.
4
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2008, Texas Instruments Incorporated