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System supervisors and voltage detectors monitor system voltages to eliminate problems during operation. On power-down, the supervisor monitors the power supply voltage and resets the system if the voltage falls below a predetermined level. On power-up, the supervisor holds the system in reset until the voltage has stabilized.
Voltage Supervisors
- Monitors systems without a MCU, for example FPGAs, PLDs and power supplies
- Can reset all or part of a system
- Localized shutdown makes system faster and less susceptible to noise
- Meets system safety regulations requiring external fail safe
- More customizable and accurate voltage trip points and reset output delay
- Supervisor options with manual resets and watchdog timers simplify firmware, add reliability and are very easy to implement
Key Features
- Watchdog Timer
- Signal required from within MCU (WDI) tWD or RST driven low
- Designed to detect faulty program execution
- Voltage Trip Point
- Standard trip voltages available on all devices
- Custom trip voltages available on some devices
- Reset Delay
- Different available options for a reset delay
- Some devices have custom options available
- WDT Period
- Devices with watchdog timers have different tWD (period)
- Low Power (Typ < 1uA)
- Typically used in battery applications
- Power sensitive with same reliability of a supervisor
- Output Type
- Push-pull or open-drain
- Active low or high
- Internal or external pull-up resistor (open-drain only)
Power Management - System Supervisors/Voltage Detectors
Design Resources
MPLAB® Analog Designer
Provides design suggestions for common circuit needs, estimates performance for common modifications, and can export to MPLAB® Mindi™ Analog Simulator for verification.
MPLAB Mindi™ Analog Simulator
Uses a SIMetrix/SIMPLIS environment to model circuit behavior, reducing design time with software debugging for initial design verification.
MicroCHECK Design Service
Our complimentary MicroCHECK design review service, which offers insight from the initial concept to the final PCB layout, is available to customers who are using our products in their projects.