UCD9090ARGZT.pdf

Features for the UCD9090A

Monitor and sequence 10 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 26 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

Response and monitor to GPI-triggered fault

Easily cascade multiple power sequencers and take coordinated fault responses

Pin-selected rail states

Cascading multiple devices

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

Description for the UCD9090A

The UCD9090A is a 10-rail PMBus/I2C addressable power supply sequencer and monitor. The device integrates a 12-bit ADC for monitoring up to 10 power supply voltage inputs. Twenty-three GPIO pins can be used for power supply enables, power-on reset signals, external interrupts, cascading, or other system functions. Ten of these pins offer PWM functionality. Using these pins, the UCD9090A offers support for 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.