Texas Instruments UCD90910RGCT

Overview

UCD90910RGCT from Texas Instruments is a 10-rail I²C/PMBus-addressable power-supply sequencer and system health monitor with integrated 12-bit ADC, closed-loop margining for ten rails, fan control for up to ten fans, and programmable watchdog timer. It supports time- and dependency-based sequencing, four-corner voltage margining, and nonvolatile fault logging - deployed in multi-rail server and telecom power systems.

For engineers reviewing the UCD90910RGCT datasheet, UCD90910RGCT pinout, UCD90910RGCT application, or UCD90910RGCT equivalent, this device delivers deterministic rail sequencing, real-time health monitoring across 13 analog inputs (voltage/current/temperature), configurable GPIO/PWM resources, and full PMBus 1.1 compliance for embedded power management in high-reliability industrial and datacom platforms.

Technical Context

The UCD90910RGCT implements a deterministic, user-configurable sequencing engine that evaluates time delays, rail dependencies (POWER_GOOD_ON/OFF), GPI states, and fault conditions to orchestrate turn-on/off of up to ten voltage rails. Its 12-bit ADC samples all 13 MON inputs every 400 ms using a 2.5-V ±0.5% internal reference.

It integrates dual fan-control algorithms supporting two- to four-wire fans, PWM outputs (FPWM1–FPWM8: 15.259 kHz–125 MHz; PWM1–PWM4: 0.93 Hz–7.8125 MHz), and closed-loop margining via dedicated margin outputs adjusting rail voltages to match user-defined thresholds - all stored in on-chip flash with 100-year retention.

Key Specifications

Pinout & Package

UCD90910RGCT is housed in a 64-pin QFN (RGC) package with exposed thermal pad. Pin assignment includes 13 analog monitor inputs (MON1–MON13), 26 GPIOs (12 with PWM capability), dual PMBus interface (PMBUS_CLK/PMBUS_DATA), JTAG debug interface, reset input, and dedicated power/ground domains (V33A, V33D, V33DIO1/2, AVSS/DVSS).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power-supply sequencing and monitoring applications.

Compared with UCD90160RGCT and TPS659122ZQWR, the UCD90910RGCT uniquely balances 10-rail sequencing, closed-loop margining, 10-fan control, and nonvolatile fault logging in a single 64-pin QFN - making it optimal for mid-complexity server, telecom, and industrial power systems requiring comprehensive health monitoring without regulator integration.

Availability

UCD90910RGCT is available at Aetrix Electronics and suitable for server power management, telecom line card sequencing, industrial ATE validation, and storage controller board health monitoring requiring stable component supply and long-term lifecycle support.

Supply support for UCD90910RGCT 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 specializing in analog, embedded processing, and power management technologies, with leadership in digital power control ICs since 2005.

The UCD90910RGCT belongs to TI's Fusion Digital Power™ sequencer family, designed specifically for intelligent, PMBus-configurable power-supply supervision and health monitoring in high-density computing and communications infrastructure.

FAQ

What is the primary function of the UCD90910RGCT?

The UCD90910RGCT is a 10-rail power-supply sequencer and system health monitor with integrated 12-bit ADC, closed-loop margining, fan control, and PMBus 1.1 interface. Its primary function is to coordinate the precise turn-on/turn-off order of multiple voltage rails, detect faults (UV/OV/OC/OT), log events to nonvolatile memory, and support four-corner testing - all while enabling real-time system health visibility in servers, telecom, and industrial equipment. The UCD90910RGCT performs these tasks autonomously after configuration via Fusion GUI or PMBus commands.

How many analog monitor inputs does the UCD90910RGCT support, and what are their voltage ranges?

The UCD90910RGCT supports 13 analog monitor inputs: MON1 through MON9 accept 0 V to 2.5 V, while MON10 through MON13 accept 0.2 V to 2.5 V - optimized for low-voltage rails like 0.8 V and 1.8 V. All inputs connect to a shared 12-bit ADC with 2.5-V ±0.5% internal reference, sampled every 400 ms. These inputs are used for voltage, current (via external sense amplifiers like INA196), and temperature monitoring. The UCD90910RGCT uses these measurements to enforce power-good thresholds, trigger sequencing actions, and log faults.

Does the UCD90910RGCT support closed-loop margining, and how is it implemented?

Yes, the UCD90910RGCT supports closed-loop margining for up to ten rails using dedicated margin outputs (e.g., PWM3/PWM4) that adjust rail voltage to match user-defined high/low margin thresholds. Margining is implemented by comparing measured rail voltage against programmed limits and dynamically modulating the margin output duty cycle to shift the rail's feedback node - enabling accurate four-corner testing without external instrumentation. This functionality is fully configurable in the Fusion GUI and stored in on-chip flash. The UCD90910RGCT executes margining autonomously during system validation or runtime diagnostics.

What fan control capabilities does the UCD90910RGCT provide?

The UCD90910RGCT supports up to ten independent fans using eight FPWM outputs (15.259 kHz–125 MHz) and four dedicated PWM outputs (0.93 Hz–7.8125 MHz), plus ten tachometer inputs (TACH1–TACH10) compatible with two-, three-, and four-wire fans. It implements two built-in fan-control algorithms that correlate speed to temperature using user-defined setpoints, and supports real-time tach monitoring with 30–300k RPM range and 30 RPM resolution. Fan behavior is fully programmable via PMBus or Fusion GUI. The UCD90910RGCT uses these features to deliver autonomous, thermally adaptive cooling without host processor intervention.

Is the UCD90910RGCT compatible with standard PMBus commands, and which version does it support?

Yes, the UCD90910RGCT is fully compliant with PMBus specification Revision 1.1 and supports standard commands for reading voltage, current, temperature, status registers, and configuring operation modes. For device-specific functions - such as rail sequencing, margining, fan algorithms, and fault logging - it implements MFR_SPECIFIC commands defined in TI's SLVU352 command reference. The interface operates at 100 kHz or 400 kHz, uses open-drain SMBus-compatible signaling, and includes PMBUS_ALERT for interrupt-driven fault reporting. The UCD90910RGCT maintains full interoperability with industry-standard PMBus masters and monitoring tools.