UCD90124A
www.ti.com
SLVSAN8 –JANUARY 2012
12-Rail Power Supply Sequencer and Monitor with ACPI Support and Fan Control
Check for Samples: UCD90124A
1
FEATURES
DESCRIPTION
The UCD90124A is a 12-rail PMBus/I2C addressable
power-supply sequencer and monitor. The device
integrates a 12-bit ADC for monitoring up to 12
power-supply voltage inputs. Twenty-six GPIO pins
can be used for power supply enables, power-on
reset signals, external interrupts, cascading, or other
system functions. Twelve of these pins offer PWM
functionality. Using these pins, the UCD90124A offers
2
•
Monitor and Sequence 12 Voltage Rails
–
–
–
All Rails Sampled Every 400 μs
12-bit ADC With 2.5-V, 0.5% Internal VREF
Sequence Based on Time, Rail and Pin
Dependencies
–
Four Programmable Undervoltage and
Overvoltage Thresholds per Monitor
support
for
fan
control,
margining,
and
•
•
Nonvolatile Error and Peak-Value Logging per
Monitor (up to 12 Fault Detail Entries)
general-purpose PWM functions.
Specific power states can be achieved using the
Pin-Selected Rail States feature. This feature allows
with the use of up to 3 GPIs to enable and disable
any rail. This is useful for implementing system
low-power modes and the Advanced Configuration
and Power Interface (ACPI) specification that is used
for hardware devices.
Closed-Loop Margining for 10 Rails
–
Margin Output Adjusts Rail Voltage to
Match User-Defined Margin Thresholds
•
Programmable Watchdog Timer and System
Reset
•
•
•
Flexible Digital I/O Configuration
Pin-Selected Rail States
The TI Fusion Digital Power™ designer software is
provided for device configuration. This PC-based
graphical user interface (GUI) offers an intuitive
interface for configuring, storing, and monitoring all
system operating parameters.
Multiphase PWM Clock Generator
–
Clock Frequencies From 15.259 kHz to
125 MHz
12V
12V OUT
–
Capability to Configure Independent Clock
Outputs for Synchronizing Switch-Mode
Power Supplies
TEMP12V
3.3V_UCD
TEMP IC
I12V
INA196
5.1V
12V OUT
GPIO
GPIO
VIN
3.3V OUT
•
JTAG and I2C/SMBus/ PMBus™ Interfaces
VMON
VOUT
/EN
DC-DC 1
3.3V OUT
VFB
VMON
VMON
VMON
VMON
VMON
VMON
VMON
1.8V OUT
0.8V OUT
I0.8V
APPLICATIONS
VIN
1.8V OUT
•
•
Industrial / ATE
/EN VOUT
GPIO
TEMP0.8V
I12V
LDO1
Telecommunications and Networking
Equipment
TEMP12V
TEMP0.8V
TEMP IC
VIN
0.8V OUT
UCD90124A
VOUT
•
•
Servers and Storage Systems
/EN
GPIO
PWM
WDI from main
processor
DC-DC 2
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
VFB
WDO
Any System Requiring Sequencing and
Monitoring of Multiple Power Rails
I0.8V
INA196
POWER_GOOD
Vmarg
2MHz
WARN_OC_0.8V_
OR_12V
Closed Loop
Margining
SYSTEM RESET
4- wire Fan
12 V
OTHER
SEQUENCER DONE
(CASCADE INPUT)
12V
I2C/
PMBUS
25 kHz Fan PWM
Fan Tach
PWM
GPIO
PWM
TACH
GND
JTAG
DC Fan
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.
2
PMBus, Fusion Digital Power are trademarks of Texas Instruments.
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 © 2012, Texas Instruments Incorporated