Overview
The UCD90120A, specifically the UCD90120ARGCT model from Texas Instruments, is a sophisticated 12-rail power supply sequencer and monitor. This device is designed to integrate advanced power management capabilities, including monitoring and sequencing of up to 12 independent voltage rails. It is particularly useful in systems that require precise control over multiple power supplies, such as industrial, telecommunications, and server systems. The UCD90120A supports the Advanced Configuration and Power Interface (ACPI) specification, enabling the implementation of system low-power modes. It also features a comprehensive set of tools for configuration, monitoring, and fault management through the TI Fusion Digital Power™ designer software.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Number of Voltage Rails | Monitored and sequenced | 12 |
| ADC Resolution | Internal reference accuracy | 12-bit, 2.5V, 0.5% (0°C to 125°C) |
| Sampling Period | All rails sampled every | 400 µs |
| GPIO Pins | Total number and PWM functionality | 26 (12 with PWM functionality) |
| Undervoltage and Overvoltage Thresholds | Programmable thresholds per monitor | Four |
| Margining Capability | Closed-loop margining for | 10 rails |
| Communication Interfaces | I2C/SMBus/PMBus and JTAG | Yes |
| Operating Temperature Range | °C | -40 to 125 |
| Package Type | VQFN (RGC) | 64 pins |
Key Features
- Monitoring and Sequencing: Monitors and sequences up to 12 voltage rails with sampling every 400 µs.
- ADC and Reference: 12-bit ADC with a 2.5V internal reference accuracy of 0.5% (0°C to 125°C).
- Programmable Thresholds: Four programmable undervoltage and overvoltage thresholds per monitor.
- Margining and PWM: Closed-loop margining for 10 rails and PWM functionality for power supply margining and general-purpose use.
- Watchdog Timer and System Reset: Programmable watchdog timer and system reset capabilities.
- Digital I/O Configuration: Flexible digital I/O configuration with Boolean logic builder for GPO outputs.
- Pin-Selected Rail States: Allows using up to 3 GPIs to enable and disable any rail, useful for implementing system low-power modes and ACPI specification.
- Communication Interfaces: Supports I2C/SMBus/PMBus and JTAG interfaces.
- Fault Management: Nonvolatile error and peak-value logging, programmable fault responses including retries, shutdown slaves, and resequence.
Applications
- Industrial and ATE: Suitable for industrial automation and automated test equipment (ATE).
- Telecommunications and Networking Equipment: Used in telecommunications and networking systems that require multiple power rail management.
- Servers and Storage Systems: Ideal for server and storage systems needing precise power supply sequencing and monitoring.
- Any System Requiring Multiple Power Rails: Applicable to any system that needs sequencing and monitoring of multiple power rails.
Q & A
- What is the primary function of the UCD90120A?
The UCD90120A is a 12-rail power supply sequencer and monitor, designed to monitor and sequence up to 12 independent voltage rails.
- What is the sampling period for all voltage rails?
All rails are sampled every 400 µs.
- How many GPIO pins does the UCD90120A have, and what is their functionality?
The device has 26 GPIO pins, with 12 of these pins offering PWM functionality.
- What communication interfaces does the UCD90120A support?
The device supports I2C/SMBus/PMBus and JTAG interfaces.
- What is the operating temperature range of the UCD90120A?
The operating temperature range is -40°C to 125°C.
- What is the purpose of the Pin-Selected Rail States feature?
This feature allows using up to 3 GPIs to enable and disable any rail, useful for implementing system low-power modes and ACPI specification.
- How does the UCD90120A handle fault responses?
The device allows programmable fault responses including retries, shutdown slaves, and resequence, and stores fault events in nonvolatile flash memory.
- What software tool is provided for device configuration?
The TI Fusion Digital Power™ designer software is provided for configuring, storing, and monitoring all system operating parameters.
- What is the margining capability of the UCD90120A?
The device supports closed-loop margining for up to 10 voltage rails.
- Can the UCD90120A be used in safety-critical applications?
No, the device is not recommended for use in safety-critical applications. Refer to the data sheet for important disclaimers and notices.
