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Power Supervision | Cypress

Block Diagram

Power supervision plays a critical role in modern communications and industrial systems such as routers, switches, storage systems, servers, base stations, industrial automation equipment and medical imaging equipment. These systems require multiple power supply rails for their various components including ASICs, PHY devices, FPGAs, CPUs, memory modules, and peripheral I/O devices.

Power Supervision is a mission-critical function for system reliability. System power must work flawlessly. The designer needs to ensure that all the power rails are ramped up and down in the proper sequence with proper delays, they are monitored for irregular activity and fault detection and response must be fast and flawless.

Your mission-critical systems need fail-safe Power Supervision

Design Considerations

Design Challenges

The race to build higher performance systems and the demand for reliable energy-efficient products is posing new challenges to designers.

  1. Low-voltage power rails demand higher accuracy
    Monitoring voltage and current accuracy is critical to system reliability
    Trimming voltage accuracy is critical to maintain optimal voltage ranges
    The latest FPGAs and DSPs have low-voltage rails (1 V and below), requiring…
    Sub-0.5% (5-mV) monitoring accuracy (need expensive analog ICs)
    Sub-1.0% (10-mV) real-time trimming accuracy (need more expensive analog ICs)
  2. The number of power rails is increasing
    20+ power rails per board need Power Supervision
    Requiring up to 10 Power Supervision ICs per board
    More ICs = more points of failure
  3. Each board requires complex customization
    Different number of power rails
    Different Voltage Sequencing, Power Monitoring, and Trimming parameters
    Fault Detection and Fault Logging referenced to custom thresholds
    Power Supervision and analog ICs from multiple vendors complicate and slow development

PSoC solves these problems

PSoC monitors voltage and current with 0.26% accuracy and performs real-time Trimming with 0.60% accuracy

PSoC supports 32 power rails per chip, 3x other Power Supervision ICs, reducing points of failures

PSoC Component Configuration Tools create customized power rail configurations with Event-Based Sequencing

PSoC creates a one-chip, customized, fail-safe Power Supervision solution

Getting Started

  1. Select the right PSoC for your application (see table below)
    Key Features
    PSoC 5
    PSoC 3
    PSoC 1
    Number of voltage rails sequenced
    up to 32
    up to 32
    up to 20
    Number of voltage and current monitoring inputs
    up to 32
    up to 32
    up to 24
    ADC based voltage and current monitoring accuracy
    Number of trimming/margining outputs
    up to 32
    up to 32
    up to 12
    EEPROM fault and event log size
    up to 2KB
    up to 2KB
    up to 2KB
    Embedded MCU Core
    ARM Cortex - M3
  2. Watch a PSoC Power Supervision Training Video
  3. Download Install the PSoC Integrated Design Environment
  4. Download the PSoC Power Supervision Application Note
  5. Purchase the PSoC Power Supervision Kit and Prototype the Example Project Design (bundled with kit)
  6. Configure your Design using Power Supervision Components or User Modules (Refer to the Power Supervision Application Note)

Integrate Additional Functions with PSoC

Apart from the standard Power Supervision functionality PSoC enables integration of additional functions. This could enable further BOM integration and cost savings (some examples below)

Fan Control & Thermal Management: AN66627 (PSoC 3 and PSoC 5), AN78692 (PSoC 1)

Temperature Sensing: Temperature Sensing & Control Solution

Miscellaneous Functions: I2C Mux, I2C Expander, I2C Level Translator, I2C Bridge, Reset control logic, MDIO Mux, MDIO Expander, LED Test & Drive, USB-UART Maintenance Ports, SGPIO Backplane & Enclosure Management. Contact your local Sales Representative

Application Notes

Application Note
PSoC 5
PSoC 3
PSoC 1
Power Supervision Solution
Development Kits/Boards
PSoC 5
PSoC 3
PSoC 1
PSoC Development Kit
PSoC Power Supervision Kit

Application Notes

  • AN76474 demonstrates how you can quickly implement and customize a full-featured power supervisor that supports up to 13 power supply rails with Cypress's PSoC® 3.

  • AN78646 describes the key concepts of power management, including voltage sequencing, fault detection, voltage and current monitoring, real-time trimming, and i2c host communication. the associated example project delivers a fully integrated power management system solution.

Development Kits/Boards


  • use for camtasia screencasts


Software and Drivers

  • PSoC Creator

    PSoC Creator is a state-of-the-art software development IDE combined with a revolutionary graphical design editor to form a uniquely powerful hardware/software co-design environment.

  • PSoC Designer

    PSoC Designer is the revolutionary Integrated Design Environment (IDE) that you can use to customize PSoC to meet your specific application requirements. PSoC Designer software accelerates system bring-up and time-to-market.