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The UCD9090ARGZR is a 10-rail PMBus/I2C addressable power sequencer and monitor. The device integrates a 12-bit ADC for monitoring up to 10 supply voltage inputs. There are 23 general-purpose input/output (GPIO) pins that can be used for power enable, power-on reset signals, external interrupts, cascading, or other system functions. Ten of the GPIO pins provide PWM functions. Using these pins, the UCD9090A supports margin adjustment and general-purpose PWM functions.

Specific power supply states can be realized by using the pin-selectable voltage rail state function. This function allows up to three GPIs to be used to enable and disable any voltage rail. This is useful for implementing system low-power modes and advanced configuration and power interface (ACPI) specifications for hardware devices.

Features

- 10 voltage rails can be monitored and sequenced

- All voltage rails sampled every 400 μs

- 12-bit ADC with 2.5V, 0.5% internal VREF

- Sequencing based on time, rail and pin correlation

- 4 programmable undervoltage and overvoltage thresholds per monitor

- Non-volatile error and peak logging available per monitor (up to 26 fault detail entries)

- Closed-loop margining for 10 voltage rails

- Margin outputs adjust rail voltages to match user-defined margin thresholds

- Programmable watchdog timer and system reset

- Flexible digital I/O configuration

- Responds to and monitors GPI-triggered faults

- Multiple power sequence generators can be easily cascaded and coordinated to provide fault response

- Pin-selectable voltage rail status

- Multiple devices can be cascaded

- Multi-phase PWM clock generator

- Clock frequencies from 15.259 kHz to 125 MHz

- Ability to configure independent clock outputs for synchronized switch-mode power supplies

- JTAG and I2C/SMBus/PMBus™ interfaces

Applications

- Industrial and automated test equipment (ATE)

- Telecommunications and networking equipment

- Server and storage systems

- Any system that requires sequencing and monitoring of multiple power rails

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