{"id":6882,"date":"2026-06-22T01:48:12","date_gmt":"2026-06-22T01:48:12","guid":{"rendered":"https:\/\/materialparts.com\/ucd9081rhbr-2\/"},"modified":"2026-06-22T01:48:12","modified_gmt":"2026-06-22T01:48:12","slug":"ucd9081rhbr-2","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/ucd9081rhbr-2\/","title":{"rendered":"UCD9081RHBR"},"content":{"rendered":"

\u4ea7\u54c1\u6982\u89c8<\/h2>\n

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.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u7c7b\u578b<\/td>\n8-Channel Power Supply Sequencer\/Monitor<\/td>\n<\/tr>\n
Rails Monitored<\/td>\n8<\/td>\n<\/tr>\n
Sequenced Outputs<\/td>\n8 (enable outputs)<\/td>\n<\/tr>\n
\u7535\u6e90\u7535\u538b<\/td>\n3.0 V to 3.6 V<\/td>\n<\/tr>\n
ADC Resolution<\/td>\n3.2 mV (rail voltage sampling)<\/td>\n<\/tr>\n
Interface<\/td>\nI2C (100 kHz slave)<\/td>\n<\/tr>\n
Sequencing<\/td>\nTimeline, parent rail, or threshold-based<\/td>\n<\/tr>\n
Alarm Response<\/td>\nIgnore\/Log\/Retry\/Shutdown\/Sequence<\/td>\n<\/tr>\n
Error Logging<\/td>\nSRAM FIFO (8-deep) + Flash (8-deep)<\/td>\n<\/tr>\n
GPO<\/td>\n4 configurable digital outputs<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nVQFN-32 (5 x 5 mm)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40C to +85C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Sequences and monitors 8 independent voltage rails<\/li>\n
  • 3.2 mV ADC resolution for voltage monitoring<\/li>\n
  • Flexible sequencing: time-based, parent rail, or threshold<\/li>\n
  • Independent under\/overvoltage thresholds per rail<\/li>\n
  • Configurable alarm processing per rail<\/li>\n
  • Non-volatile error logging with timestamp<\/li>\n
  • 4 general-purpose digital outputs<\/li>\n
  • I2C interface for configuration and monitoring<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Server and telecom power sequencing<\/li>\n
    • Multi-rail FPGA\/SoC power management<\/li>\n
    • Industrial equipment power-up control<\/li>\n
    • Test equipment power monitoring<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview 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. Key Specifications Type 8-Channel Power Supply Sequencer\/Monitor Rails Monitored 8 Sequenced Outputs 8 (enable outputs) Supply Voltage 3.0 V to 3.6 V ADC Resolution 3.2 mV (rail […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,29],"tags":[],"chip_brand":[138],"class_list":["post-6882","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-power-management-ics-pmic","chip_brand-ti"],"acf":{"brief_explanation":"8-Channel Power Sequencer\/Monitor, I2C, Error Logging, VQFN-32","date_code":"","package_case":"VQFN-32 (5.0 x 5.0 x 0.9 mm)","in_stock":1234,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/ucd9081.pdf","price":"$3.50 @ 1ku","product_introduction":"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.","working_principle":"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.","pin_description":"
      Pin Group<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      8 pins<\/td>EN1-EN8<\/td>Output<\/td>Rail enable outputs (active HIGH)<\/td><\/tr>
      8 pins<\/td>VIN1-VIN8<\/td>Input<\/td>Rail voltage monitor inputs<\/td><\/tr>
      4 pins<\/td>GPO1-GPO4<\/td>Output<\/td>General-purpose digital outputs<\/td><\/tr>
      2 pins<\/td>SDA\/SCL<\/td>I\/O<\/td>I2C data and clock<\/td><\/tr>
      Dedicated<\/td>RESET<\/td>Input<\/td>Device reset (active LOW)<\/td><\/tr>
      Dedicated<\/td>VDD\/GND<\/td>Power<\/td>3.3V supply and ground<\/td><\/tr><\/table>","application_scenarios":"
      • Multi-rail FPGA power sequencing with 8 voltage monitors and alarm logging<\/li>
      • Server board 8-rail power-up with time-based sequencing and flash error logging<\/li>
      • Industrial PLC power management with threshold-based sequencing and retry<\/li>
      • Telecom line card hot-swap power control with 4 GPO status outputs<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        TI<\/td>UCD90120RHBR<\/td>VQFN-32<\/td>8-rail sequencer, newer generation<\/td><\/tr>
        TI<\/td>UCD9090RHBR<\/td>VQFN-32<\/td>10-rail sequencer, more rails<\/td><\/tr>
        ADI<\/td>LTC2928CGN<\/td>SSOP-28<\/td>4-rail sequencer, simpler<\/td><\/tr>
        TI<\/td>TPS38700PQR<\/td>VQFN-20<\/td>5-rail sequencer, smaller<\/td><\/tr>
        onsemi<\/td>NCP3170AMNTWG<\/td>QFN-28<\/td>5-rail sequencer, alternative<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6882","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/comments?post=6882"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6882\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=6882"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=6882"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=6882"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=6882"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}