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UCD9081 Datasheet Preview

UCD9081 Datasheet

8-Channel Power-Supply Sequencer/Monitor

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UCD9081
SLVS813C – JUNE 2008 – REVISED NOVEMBER 2016
UCD9081 8-Channel Power Supply Sequencer and Monitor With Error Logging
1 Features
1 Single Supply Voltage: 3.3 V
• Low Power Consumption: 3-mA 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
Functional Block Diagram
MON1
MON2
MON3
MON4
MON5
MON6
MON7
MON8
Analog
Inputs
Oscillator
Sequencing
Engine
Power
Enables
10-bit
SAR ADC
Status
Registers
Config
Memory
Error Log
Flash
Memory
General-
Purpose
Outputs
I2C
Engine
EN1
EN2
EN3
EN4
EN5
EN6
EN7
EN8/GPO1
GPO2
GPO3
GPO4
2 Applications
• Telecommunications Switches
• Servers
• Networking Equipment
• Test Equipment
• Industrial
• Any System Requiring Sequencing of Multiple
Voltage Rails
3 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 20 shows the UCD9081 power-supply
sequencer in a typical application.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
UCD9081
VQFN (32)
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Diagram
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
VOUT1
Power
Supply
EN
2
VOUT2
3.3 V
Power
Supply
EN
X
VOUTX
Digital
Outputs
Copyright © 2016, Texas Instruments Incorporated
SCL SDA
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




etcTI

UCD9081 Datasheet Preview

UCD9081 Datasheet

8-Channel Power-Supply Sequencer/Monitor

No Preview Available !

UCD9081
SLVS813C – JUNE 2008 – REVISED NOVEMBER 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 5
6.1 Absolute Maximum Ratings ...................................... 5
6.2 Recommended Operating Conditions....................... 5
6.3 Thermal Information .................................................. 5
6.4 Electrical Characteristics........................................... 5
6.5 Timing Requirements: I2C Interface.......................... 6
6.6 Typical Characteristics .............................................. 7
7 Parameter Measurement Information .................. 8
8 Detailed Description .............................................. 9
8.1 Overview ................................................................... 9
8.2 Functional Block Diagram ......................................... 9
8.3 Feature Description................................................. 10
8.4 Device Functional Modes........................................ 11
8.5 Programming........................................................... 14
8.6 Register Maps ......................................................... 18
9 Application and Implementation ........................ 24
9.1 Application Information............................................ 24
9.2 Typical Application .................................................. 25
10 Power Supply Recommendations ..................... 28
11 Layout................................................................... 28
11.1 Layout Guidelines ................................................. 28
11.2 Layout Example .................................................... 28
12 Device and Documentation Support ................. 29
12.1 Documentation Support ........................................ 29
12.2 Receiving Notification of Documentation Updates 29
12.3 Community Resources.......................................... 29
12.4 Trademarks ........................................................... 29
12.5 Electrostatic Discharge Caution ............................ 29
12.6 Glossary ................................................................ 29
13 Mechanical, Packaging, and Orderable
Information ........................................................... 29
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (December 2010) to Revision C
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section .................................................................................................. 1
• Deleted Ordering Information table; see POA at the end of the data sheet........................................................................... 1
• Added Thermal Information table ........................................................................................................................................... 5
• Moved Timing Parameters for I2C Interface table and I2C Timing diagram to Specifications ................................................ 6
• Moved content in Monitoring the UCD9081 to Register Maps ............................................................................................. 18
Changes from Revision A (September 2008) to Revision B
Page
• Added Note 1 to the PIN FUNCTIONS table ......................................................................................................................... 3
• Added Note regarding state of enable and digital I/O pins when the device contains factory configuration ....................... 15
• Added a reference to the UCD9081 Programming Guide.................................................................................................... 16
Changes from Original (June 2008) to Revision A
Page
• Changed the data sheet from Product Preview to Production; multiple changes throughout................................................ 1
• Changed first RAIL voltage equation From: × VREF To: × VR+ ............................................................................................. 19
• Changed second RAIL voltage equation From: × VREF To: × VR+ ....................................................................................... 19
2
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Product Folder Links: UCD9081
Copyright © 2008–2016, Texas Instruments Incorporated


Part Number UCD9081
Description 8-Channel Power-Supply Sequencer/Monitor
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