SLVSDD7A September   2016  – February 2019 UCD9090A


  1. Features
  2. Applications
  3. Description
    1.     Typical Application Schematic
  4. Revision History
  5. Pin Configuration and Functions
    1.     Pin Functions
  6. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 I2C/Smbus/PMBus Timing Requirements
    7. 6.7 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 TI Fusion GUI
      2. 7.3.2 PMBus Interface
      3. 7.3.3 Rail Configuration
    4. 7.4 Device Functional Modes
      1. 7.4.1  Power Supply Sequencing
        1. Turn-On Sequencing
        2. Turn-Off Sequencing
        3. Sequencing Configuration Options
      2. 7.4.2  Pin-Selected Rail States
      3. 7.4.3  Monitoring
        1. Voltage Monitoring
        2. Current Monitoring
        3. Remote Temperature Monitoring and Internal Temperature Sensor
        4. Temperature by Host Input
      4. 7.4.4  Fault Responses and Alert Processing
      5. 7.4.5  Shut Down All Rails and Sequence On (Resequence)
      6. 7.4.6  GPIOs
      7. 7.4.7  GPO Control
      8. 7.4.8  GPO Dependencies
        1. GPO Delays
        2. State Machine Mode Enable
      9. 7.4.9  GPI Special Functions
        1. Fault Shutdown Rails
        2. Configured as Sequencing Debug Pin
        3. Configured as Fault Pin
        4. Cold Boot Mode Enable
      10. 7.4.10 Power Supply Enables
      11. 7.4.11 Cascading Multiple Devices
      12. 7.4.12 PWM Outputs
        1. FPWM1-8
        2. PWM1-2
      13. 7.4.13 Programmable Multiphase PWMs
      14. 7.4.14 Margining
        1. Open-Loop Margining
        2. Closed-Loop Margining
      15. 7.4.15 Run Time Clock
      16. 7.4.16 System Reset Signal
      17. 7.4.17 Watch Dog Timer
      18. 7.4.18 Data and Error Logging to Flash Memory
      19. 7.4.19 Brownout Function
      20. 7.4.20 PMBus Address Selection
      21. 7.4.21 Device Reset
      22. 7.4.22 JTAG Interface
      23. 7.4.23 Internal Fault Management and Memory Error Correction (ECC)
    5. 7.5 Programming
      1. 7.5.1 Full Configuration Update While in Normal Mode
  8. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. Estimating ADC Reporting Accuracy
      3. 8.2.3 Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • RGZ|48
Thermal pad, mechanical data (Package|Pins)
Orderable Information


From the factory, the device contains the sequencing and monitoring firmware. It is also configured so that all GPOs are high-impedance (except for FPWM/GPIO pins 10-17, which are driven low), with no sequencing or fault-response operation. See Configuration Programming of UCD Devices, available from the Documentation & Help Center that can be selected from the Fusion GUI Help menu, for full UCD9090A configuration details.

After the user has designed a configuration file using Fusion GUI, there are three general device-configuration programming options:

  1. Devices can be programmed in-circuit by a host microcontroller using PMBus commands over I2C (see the UCD90xxx Sequencer and System Health Controller PMBus Command Reference).
    Each parameter write replaces the data in the associated memory (RAM) location. After all the required configuration data has been sent to the device, it is transferred to the associated nonvolatile memory (data flash) by issuing a special command, STORE_DEFAULT_ALL. This method is how the Fusion GUI normally reads and writes a device configuration. This method may cause unexpected behaviors on GPIO pins which can disable rails that provide power to device. It is not recommended for production programming.
    This method may cause unexpected behaviors on GPIO pins which can disable rails that provide power to device. This method is not recommended for production programming.
  2. The Fusion GUI (Figure 33) can create a PMBus or I2C command script file that can be used by the I2C master to configure the device. This method may cause unexpected behaviors on GPIO pins which can disable rails that provide power to device. It is not recommended for production programming.
  3. UCD9090A FusionPMBusScript_slvsdd7.pngFigure 33. Fusion GUI PMBus Configuration Script Export Tool
  4. Another in-circuit programming option is for the Fusion GUI to create a data flash image from the configuration file (Figure 34). The configuration files can be exported in Intel Hex, data flash script, Serial Vector Format (SVF) and S-record. The image file can be downloaded into the device using I2C or JTAG. The Fusion GUI tools can be used on-board if the Fusion GUI can gain ownership of the target board I2C bus. It is recommended to use Intel Hex file or data flash script file for production programming because the GPIOs are under controlled states.
  5. UCD9090A FusionConfgExportTool_slvsdd7.pngFigure 34. Fusion GUI Device Configuration Export Tool

For small runs, a ZIF socketed board with an I2C header can be used with the standard Fusion GUI or manufacturing GUI. The TI Evaluation Module for UCD9090A 10-Channel Sequencer and System Health Monitor (UCD90SEQ48EVM-560) can be used for this purpose. The Fusion GUI can also create a data flash file that can then be loaded into the UCD9090A using a dedicated device programmer.

To configure the device over I2C or PMBus, the UCD9090A must be powered. The PMBus clock and data pins must be accessible and must be pulled high to the same VDD supply that powers the device, with pullup resistors between 1 kΩ and 2 kΩ. Care should be taken to not introduce additional bus capacitance (<100 pF). The user configuration can be written to data flash using a gang programmer via JTAG or I2C before the device is installed in circuit. To use I2C, the clock and data lines must be multiplexed or the device addresses must be assigned by socket. The Fusion GUI tools can be used for socket addressing. Pre-programming can also be done using a single device test fixture.

Table 13. Configuration Options

Off-Board Configuration Data Flash Export (.svf type file) Data Flash Export (.srec or hex, data flash script type file) Project file I2C/PMBus script
Dedicated programmer Fusion tools (with exclusive bus access via USB to I2C adapter) Fusion tools (with exclusive bus access via USB to I2C adapter)
On-Board Configuration Data flash export Fusion tools (with exclusive bus access via USB to I2C adapter) Fusion tools (with exclusive bus access via USB to I2C adapter)

The advantages of off-board configuration include:

  • Does not require access to device I2C bus on board.
  • Once soldered on board, full board power is available without further configuration.
  • Can be partially reconfigured once the device is mounted.