Overview
The UCD9081RHBTG4, produced by Texas Instruments, is a highly versatile and powerful 8-channel power supply sequencer and monitor. This device is designed to control the enable sequence of up to eight independent voltage rails, ensuring correct power sequences during both normal and fault conditions. It operates from a single 3.3-V supply and consumes a nominal supply current of 3 mA, making it energy-efficient. The UCD9081 is particularly useful in electronic systems that require multiple voltage rails, such as those found in telecommunications switches, servers, networking equipment, test equipment, and industrial applications.
Key Specifications
| Parameter | Specification |
|---|---|
| Package | VQFN (32-pin, RHB) |
| Body Size | 5.00 mm × 5.00 mm |
| Operating Temperature Range | -40°C to 85°C |
| Supply Voltage | 3.3 V |
| Nominal Supply Current | 3 mA |
| Voltage Resolution | 3.2 mV |
| Voltage Reference | Internal 2.5 V or external reference tied to VCC |
| Number of Voltage Rails | Up to 8 |
| General-Purpose Outputs | Up to 4 (GPO1–GPO4) |
| Interface | I2C™ for configuration and monitoring |
Key Features
- Sequences and monitors up to eight independent voltage rails with flexible sequencing options based on timeline, parent rail regulation window, or parent rail achieving defined threshold.
- Independent under- and overvoltage thresholds per rail with configurable regulation expiration times.
- Flexible alarm processing: ignore, log only, retry n times, retry continuously, sequence, and parent rail can shutdown child rails.
- Alarm conditions logged with timestamp: under- and overvoltage glitch, sustained under- and overvoltage, rail did not start.
- On-chip flash for storing user data and error logging for system failure analysis.
- Microsoft Windows™ GUI for configuration and monitoring.
- Configurable digital output polarity and general-purpose digital outputs for power-on-reset and other functions.
Applications
- Telecommunications switches
- Servers
- Networking equipment
- Test equipment
- Industrial applications
- Any system requiring sequencing of multiple voltage rails
Q & A
- What is the primary function of the UCD9081?
The UCD9081 is an 8-channel power supply sequencer and monitor that controls the enable sequence of up to eight independent voltage rails and provides four general-purpose digital outputs.
- What is the operating supply voltage of the UCD9081?
The UCD9081 operates from a single 3.3-V supply.
- How many voltage rails can the UCD9081 monitor and sequence?
The UCD9081 can monitor and sequence up to eight independent voltage rails.
- What is the resolution of the voltage monitoring on the UCD9081?
The UCD9081 samples rail voltages with a resolution of 3.2 mV.
- What types of alarm processing are available on the UCD9081?
The UCD9081 offers flexible alarm processing options including ignore, log only, retry n times, retry continuously, and sequence, with the ability for a parent rail to shutdown child rails.
- How does the UCD9081 log error conditions?
The UCD9081 logs error conditions with timestamps to the on-chip flash memory for system failure analysis.
- What interface does the UCD9081 use for configuration and monitoring?
The UCD9081 uses an I2C™ interface for configuration and monitoring.
- Is there a GUI available for configuring the UCD9081?
Yes, a Microsoft Windows™ GUI is available for configuring and monitoring the UCD9081.
- What are some common applications of the UCD9081?
The UCD9081 is commonly used in telecommunications switches, servers, networking equipment, test equipment, and industrial applications.
- What is the package type and size of the UCD9081?
The UCD9081 is available in a 32-pin VQFN (RHB) package with a body size of 5.00 mm × 5.00 mm.
