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 support for fan control, margining, and 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.
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.
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
Nonvolatile Error and Peak-Value Logging per Monitor (up to 12 Fault Detail Entries)
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
Multiphase PWM Clock Generator
Clock Frequencies From 15.259 kHz to 125 MHz
Capability to Configure Independent Clock Outputs for Synchronizing Switch-Mode Power Supplies
JTAG and I2C/SMBus/PMBus Interfaces
Industrial / ATE
Telecommunications and Networking Equipment
Servers and Storage Systems
Any System Requiring Sequencing and Monitoring of Multiple Power Rails