UCD9081 Datasheet, PDF (1/34 Pages) Texas Instruments – 8-CHANNEL POWER SUPPLY SEQUENCER AND MONITOR WITH ERROR LOGGING

UCD9081
www.ti.com
SLVS813B – JUNE 2008 – REVISED DECEMBER 2010
8-CHANNEL POWER SUPPLY SEQUENCER AND MONITOR WITH ERROR LOGGING
Check for Samples: UCD9081
FEATURES
1
•234 Single Supply Voltage: 3.3V
• Low Power Consumption: 3mA Nominal
Supply Current
• Sequences and Monitors Eight Voltage Rails
• Rail Voltages Sampled With 3.2-mV Resolution
• Internal or External Voltage Reference
• Four Configurable Digital Outputs for
Power-On Reset and Other Functions
• Configurable Digital Output Polarity
• Flexible Rail Sequencing Based On Timeline
(ms), Parent Rail Regulation Window, Or
Parent Rail Achieving Defined Threshold
• Independent Under- and Overvoltage
Thresholds Per Rail
• Configurable Regulation Expiration Times Per
Rail
• Flexible Alarm Processing: Ignore, Log Only,
Retry n Times, Retry Continuously, Sequence,
Parent Rail Can Shutdown Child Rails
• Alarm Conditions Logged With Timestamp:
Under- and Overvoltage Glitch, Sustained
Under- and Overvoltage, Rail Did Not Start
• On-chip Flash for Storing User Data
• Error Logging to Flash for System Failure
Analysis
• I²C™ Interface for Configuration and
Monitoring
• Microsoft™ Windows™ GUI for Configuration
and Monitoring
APPLICATIONS
• Telecommunications Switches
• Servers
• Networking Equipment
• Test Equipment
• Industrial
• Any System Requiring Sequencing of Multiple
Voltage Rails
DESCRIPTION
The UCD9081 power-supply sequencer controls the
enable sequence of up to eight independent voltage
rails and provides four general-purpose digital outputs
(GPO). 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 UCD9081
monitors the voltage rails independently and has a
high degree of rail sequence and alarm response
options. 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
UCD9081 monitors can be configured to shut down a
user-defined set of other rails and GPOs, and alarm
conditions are monitored on a per-rail basis.
Figure 1 shows the UCD9081 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 9081
VCC
SCL
SDA
VSS
EN8/
ADDR1/ ADDR2/ ADDR3/ ADDR4/
GPO1 GPO2 GPO3 GPO4
3.3 V
1 mF
Power
Supply
EN
1
V_OUT1
Power
Supply
EN
2
V_OUT2
3.3 V
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.
PowerPAD, TMS320 are trademarks of Texas Instruments.
2
Microsoft, Windows are trademarks of Microsoft Corporation.
3
I²C is a trademark of Phillips Electronics.
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 © 2008–2010, Texas Instruments Incorporated