Overview
The UCD90120A, produced by Texas Instruments, is a 12-rail power supply sequencer and monitor designed to manage and monitor multiple power rails in complex systems. This device integrates a 12-bit ADC to monitor up to 12 power-supply voltage inputs and supports both PMBus and I2C/SMBus interfaces. It is particularly useful for implementing system low-power modes and adhering to the Advanced Configuration and Power Interface (ACPI) specification. The UCD90120A is packaged in a 64-pin VQFN (RGC) package and operates over a temperature range of -40°C to 125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | VQFN (RGC) | - |
| Pins | 64 | - |
| Operating Temperature Range | -40 to 125 | °C |
| Supply Voltage During Operation | 3 to 3.6 | V |
| Junction Temperature | 125 | °C |
| ADC Resolution | 12-bit | - |
| Internal VREF Accuracy | 2.5 V, 0.5% (0°C to 125°C) | - |
| Sampling Period | 400 μs | - |
| Clock Frequencies | 15.259 kHz to 125 MHz | - |
Key Features
- Monitor and sequence 12 voltage rails with sampling every 400 μs.
- 12-bit ADC with a 2.5-V, 0.5% internal VREF.
- 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 up to 10 rails, adjusting rail voltage to match user-defined margin thresholds.
- Programmable watchdog timer and system reset.
- Flexible digital I/O configuration and pin-selected rail states.
- Multiphase PWM clock generator with clock frequencies from 15.259 kHz to 125 MHz.
- JTAG and I2C/SMBus/PMBus interfaces.
- TI Fusion Digital Power™ designer software for device configuration.
Applications
- Industrial and Automated Test Equipment (ATE).
- Telecommunications and networking equipment.
- Servers and storage systems.
- Any system requiring 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 manage and monitor multiple power rails in complex systems).
- What is the package type and pin count of the UCD90120A?
The UCD90120A is packaged in a 64-pin VQFN (RGC) package).
- What is the operating temperature range of the UCD90120A?
The operating temperature range is -40°C to 125°C).
- What is the resolution of the ADC in the UCD90120A?
The ADC has a 12-bit resolution).
- How often are the power rails sampled by the UCD90120A?
The power rails are sampled every 400 μs).
- What is the range of clock frequencies supported by the UCD90120A?
The clock frequencies range from 15.259 kHz to 125 MHz).
- Does the UCD90120A support PMBus and I2C/SMBus interfaces?
Yes, the UCD90120A supports both PMBus and I2C/SMBus interfaces).
- What software is provided for configuring the UCD90120A?
The TI Fusion Digital Power™ designer software is provided for device configuration).
- What are some common applications of the UCD90120A?
Common applications include industrial and ATE, telecommunications and networking equipment, servers and storage systems, and any system requiring sequencing and monitoring of multiple power rails).
- Can the UCD90120A perform closed-loop margining?
Yes, the UCD90120A can perform closed-loop margining for up to 10 voltage rails).
