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UCD9081RHBR

8-Channel Power Sequencer/Monitor, I2C, Error Logging, VQFN-32

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Pieza del fabricante：

UCD9081RHBR

Paquete：

VQFN-32 (5.0 x 5.0 x 0.9 mm)

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Descripción

Productos

The UCD9081RHBR from Texas Instruments is an 8-channel power supply sequencer and monitor with I2C interface, error logging, and flexible alarm processing in a VQFN-32 package.

Especificaciones

Tipo 8-Channel Power Supply Sequencer/Monitor
Rails Monitored 8
Sequenced Outputs 8 (enable outputs)
Tensión de alimentación 3.0 V to 3.6 V
ADC Resolution 3.2 mV (rail voltage sampling)
Interface I2C (100 kHz slave)
Sequencing Timeline, parent rail, or threshold-based
Alarm Response Ignore/Log/Retry/Shutdown/Sequence
Error Logging SRAM FIFO (8-deep) + Flash (8-deep)
GPO 4 configurable digital outputs
Paquete VQFN-32 (5 x 5 mm)
Temperatura de funcionamiento -40C to +85C

Características

  • Sequences and monitors 8 independent voltage rails
  • 3.2 mV ADC resolution for voltage monitoring
  • Flexible sequencing: time-based, parent rail, or threshold
  • Independent under/overvoltage thresholds per rail
  • Configurable alarm processing per rail
  • Non-volatile error logging with timestamp
  • 4 general-purpose digital outputs
  • I2C interface for configuration and monitoring

Aplicaciones

  • Server and telecom power sequencing
  • Multi-rail FPGA/SoC power management
  • Industrial equipment power-up control
  • Test equipment power monitoring

The UCD9081RHBR from Texas Instruments is an 8-channel power supply sequencer and monitor that controls the enable sequence of up to eight independent voltage rails. The device operates from a 3.3V supply and provides 3.2 mV resolution voltage monitoring via an integrated ADC. Sequencing can be configured based on timeline delays (in ms), parent rail achieving regulation, or parent rail reaching a defined threshold. Each rail has independent undervoltage and overvoltage thresholds with configurable regulation expiration times. The flexible alarm processing supports ignore, log only, retry n times, retry continuously, and system re-sequence responses. Error conditions are logged with timestamps in both volatile SRAM (8-deep FIFO) and non-volatile Flash (8-deep) for post-failure analysis. Four configurable digital outputs support power-on-reset and other system functions. The I2C slave interface at 100 kHz allows a host microcontroller to configure and monitor the device. A Windows GUI is available for configuration.

The UCD9081RHBR uses a state-machine-based sequencing engine that controls eight enable outputs (EN1-EN8) based on user-configured rules stored in on-chip Flash. During power-up, the sequencer follows the configured timeline: each rail’s enable is asserted at the programmed delay time after the previous rail achieves regulation. The integrated ADC continuously samples each rail voltage at 3.2 mV resolution and compares it against the configured under/overvoltage thresholds. If a rail fails to achieve regulation within the expiration time, or if a sustained fault is detected after regulation, the configured alarm response is executed. Alarm responses range from simple error logging to full system re-sequence. The retry mechanism disables and re-enables the faulty rail up to n times, with configurable minimum time between retries (MTFR). The non-volatile Flash error log records the fault type, timestamp (from device reset), rail number, and rail voltage at the time of fault. The 100 kHz I2C interface supports clock stretching for reliable communication.

Grupo Pin Nombre Tipo Función
8 pins EN1-EN8 Salida Rail enable outputs (active HIGH)
8 pins VIN1-VIN8 Entrada Rail voltage monitor inputs
4 pins GPO1-GPO4 Salida General-purpose digital outputs
2 pins SDA/SCL E/S I2C data and clock
Dedicado RESET Entrada Device reset (active LOW)
Dedicado VDD/GND Potencia 3.3V supply and ground
  • Multi-rail FPGA power sequencing with 8 voltage monitors and alarm logging
  • Server board 8-rail power-up with time-based sequencing and flash error logging
  • Industrial PLC power management with threshold-based sequencing and retry
  • Telecom line card hot-swap power control with 4 GPO status outputs
Fabricante Número de pieza Paquete Notas
TI UCD90120RHBR VQFN-32 8-rail sequencer, newer generation
TI UCD9090RHBR VQFN-32 10-rail sequencer, more rails
ADI LTC2928CGN SSOP-28 4-rail sequencer, simpler
TI TPS38700PQR VQFN-20 5-rail sequencer, smaller
onsemi NCP3170AMNTWG QFN-28 5-rail sequencer, alternative
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