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nanoPower Supervisor and Watchdog Timer

Ultra-Low-Current Supervisor with Dynamic Watchdog in Tiny SOT Package

Product Details

Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 2.5
Reset Out Open Drain
tRESET (min) <1ms
Watchdog Feature Input/Output (WDI/WDO)
Watchdog Enable
Watchdog Timeout Adjustable
Supervisor Features Watchdog Timer Enable Input
ICC (µA) (max) 0.9
Package/Pins WLP/6
Budgetary
Price (See Notes)
1.54
Parametric specs for Watchdog Timers
Watchdog Feature Input/Output (WDI/WDO)
Watchdog Enable
Watchdog Timeout Adjustable
Watchdog Startup Delay (min) 100ms
Watchdog Output Open-Drain
ICC (µA) (max) 0.9
Package/Pins WLP/6
Oper. Temp. (°C) -40 to +125
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Parameters

Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 2.5
Reset Out Open Drain
tRESET (min) <1ms
Watchdog Feature Input/Output (WDI/WDO)
Watchdog Enable
Watchdog Timeout Adjustable
Supervisor Features Watchdog Timer Enable Input
ICC (µA) (max) 0.9
Package/Pins WLP/6
Budgetary
Price (See Notes)
1.54
Parametric specs for Watchdog Timers
Watchdog Feature Input/Output (WDI/WDO)
Watchdog Enable
Watchdog Timeout Adjustable
Watchdog Startup Delay (min) 100ms
Watchdog Output Open-Drain
ICC (µA) (max) 0.9
Package/Pins WLP/6
Oper. Temp. (°C) -40 to +125

Key Features

  • 400nA (typ) Supply Current
  • 1.2V to 5.5V Operating Supply Range
  • Monitors Supply Voltage and Provides System Reset Signal
  • 1.5V to 5V Input Threshold Range in 100mV Increments
  • Watchdog Function Detects Faulty Code Execution
  • Open-Drain Reset and Watchdog Outputs
  • Watchdog Timer Enable Input
  • 6-Bump WLP Package
  • 6-Pin SOT23 Package
  • -40°C to +125°C Operating Temperature Range

Applications/Uses

  • Glucose Monitors/Patient Monitor
  • Metering
  • Portable/Battery-Powered Equipment
  • Tablets/e-Readers/Mobile Devices

Description

The MAX16152/MAX16153/MAX16154/MAX16155 ultra-low-current supervisory circuits monitor a single system supply voltage and the integrity of code execution by a microprocessor or microcontroller. These supervisors assert the reset output whenever the VCC supply voltage is greater than the minimum operating voltage, but less than the reset threshold. After the supply voltage rises above the reset threshold, the reset output remains asserted for the reset timeout period, and then de-asserts. Reset voltage thresholds are available from 1.50V to 5.0V in approximately 100mV increments.

A watchdog timer circuit monitors microprocessor or microcontroller activity. During normal operation, the microprocessor or microcontroller should repeatedly toggle the watchdog input (WDI) before the supervisor’s watchdog timeout period elapses to confirm that the system is executing code properly. If the microprocessor or microcontroller does not provide a valid watchdog input transition before the timeout period expires, the supervisor asserts a watchdog (active-low WDO) output to signal that the system is not executing code as expected. The watchdog output pulse can be used to reset the microprocessor or microcontroller, or it may be used to interrupt the system to warn of execution errors. The MAX16152 and MAX16153 feature a manual reset input (active-low MR) to allow an external pushbutton or logic signal to initiate a reset pulse. The MAX16154 and MAX16155 feature a logic input (WD_EN) that allows the system to enable and disable the watchdog function.

The MAX16152 and MAX16154 are offered in a 0.86mm x 1.27mm, 6-bump WLP, while the MAX16153 and MAX16155 are offered in 6-pin SOT23 package. All devices operate over the -40°C to +125°C temperature range.

Simplified Block Diagram

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .