Texas Instruments UCD90320ZWSR

Overview

UCD90320ZWSR from Texas Instruments is a 32-rail PMBus™ power sequencer and system manager in a 12.0 mm × 12.0 mm BGA-169 package, integrating 24 analog monitor channels (AMON), 32 rail enable outputs (EN), 24 closed-loop margining outputs (MAR), and 84 configurable GPIOs. It sequences, monitors, and margins up to 32 voltage rails-including 24 analog and 8 digital rails-in high-reliability computing and networking systems.

For engineers reviewing the UCD90320ZWSR datasheet, UCD90320ZWSR pinout, UCD90320ZWSR application, or UCD90320ZWSR equivalent, this device supports complex sequencing dependencies, real-time fault response (OV/UV/OC/temperature), black-box fault logging, cascaded coordination across up to four devices via SYNC_CLK, and high-accuracy closed-loop margining for system validation and AVID regulator control.

Technical Context

The UCD90320ZWSR implements a deterministic, firmware-configurable sequencing engine with Boolean logic builders for 16 logic GPOs, enabling programmable responses to GPI-triggered faults, POWER_GOOD status, or rail warnings. Its 24-channel 12-bit ADC operates at 1 MSPS per channel with ±30 LSB total unadjusted error using internal reference, supporting simultaneous monitoring of voltage, current (via external sense amps), and temperature.

It features dual-bank nonvolatile configuration flash (100k-cycle endurance, 20-year retention) and dedicated fault event EEPROM (500k-cycle, 20-year retention), with black-box logging capturing all 32 rail states and 84 I/O pin levels at first fault. Cascading uses a single SYNC_CLK signal to synchronize sequencing and coordinated fault shutdown across up to four UCD90320ZWSR devices.

Key Specifications

Pinout & Package

UCD90320ZWSR uses a 169-pin BGA (ZWS package) with 0.8-mm pitch and 12.0 mm × 12.0 mm body size. Pin functions are grouped into analog monitor inputs (AMON1–AMON24), rail enable outputs (EN1–EN32), closed-loop margin outputs (MAR1–MAR24), digital monitor inputs (DMON1–DMON8), logic GPOs (LGPO1–LGPO16), GPIOs (GPIO1–GPIO4), cascading interface (SYNC_CLK), and PMBus/JTAG interfaces.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power sequencing and system management applications.

Compared with UCD90160RGZR and LM97794RHAT, the UCD90320ZWSR uniquely delivers 32-rail scalability, synchronized multi-device cascading, black-box fault capture, and high-accuracy closed-loop margining-making it the only option for enterprise-grade server, telecom, and medical systems requiring full-system power intelligence and debug traceability.

Availability

UCD90320ZWSR is available at Aetrix Electronics and suitable for wired networking infrastructure, data center server platforms, and industrial automation systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for UCD90320ZWSR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company delivering analog and embedded processing solutions, with leadership in power management ICs and digital power controllers.

The UCD90320ZWSR belongs to TI's Fusion Digital Power™ sequencer family, designed specifically for high-reliability, multi-rail power management in computing, networking, and industrial systems requiring deterministic sequencing, comprehensive telemetry, and field-debuggable fault history.

FAQ

What is the maximum number of voltage rails the UCD90320ZWSR can manage?

The UCD90320ZWSR manages up to 32 voltage rails: 24 analog-monitored rails via its 24-channel 12-bit ADC (AMON1–AMON24) and 8 digital-monitored rails using DMON1–DMON8 inputs. This capacity supports complex systems like multi-core CPUs, FPGAs, and ASICs requiring strict sequencing and health monitoring across diverse supply domains.

Does the UCD90320ZWSR support closed-loop margining, and how many rails does it cover?

Yes, the UCD90320ZWSR supports high-accuracy closed-loop margining on up to 24 voltage rails using its MAR1–MAR24 pins. Each margin pin delivers a PWM output that drives external op-amp feedback networks, enabling precise adjustment of DC/DC output voltage during production test and runtime trim-critical for AVID and four-corner validation.

How does cascading work on the UCD90320ZWSR, and what is the maximum number of devices supported?

The UCD90320ZWSR uses a single bidirectional SYNC_CLK pin to cascade up to four devices. This enables synchronized power-on/off sequencing and coordinated fault response (e.g., simultaneous shutdown) across all linked units. The FAULT pin propagates critical events between devices, ensuring system-level reliability without additional control logic.

What type of nonvolatile memory does the UCD90320ZWSR use for configuration and fault logging?

The UCD90320ZWSR employs dual-bank configuration flash memory (100,000 program/erase cycles, 20-year data retention) for fail-safe firmware updates, plus dedicated fault event EEPROM (500,000 cycles, 20-year retention). The black-box log captures rail states and I/O levels at first fault-preserving critical debug data even after power loss.

Is the UCD90320ZWSR compatible with standard PMBus v1.2 hosts, and which commands does it support?

Yes, the UCD90320ZWSR is fully PMBus v1.2 compliant as a slave device. It supports standard commands including READ_VIN, READ_VOUT, CLEAR_FAULTS, STORE_DEFAULT_ALL, and WRITE_PROTECT, plus TI-extended commands for rail sequencing control, margining activation, and black-box log retrieval via PMBUS_DATA/PMBUS_CLK interface.