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nanoPower Supervisor and Watchdog Timer

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

产品详情

主要特征

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 SOT23/6
Budgetary
Price (See Notes)
1.39
Parametric specs for Watchdog Timers
Watchdog Startup Delay (min) <60s
Watchdog Output Open-Drain
Package/Pins SOT23/6
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参量

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 SOT23/6
Budgetary
Price (See Notes)
1.39
Parametric specs for Watchdog Timers
Watchdog Startup Delay (min) <60s
Watchdog Output Open-Drain
Package/Pins SOT23/6

主要特征

  • 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

应用/用途

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

描述

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.

简化框图

MAX16152, MAX16153, MAX16154, MAX16155: Typical Application Circuit MAX16152, MAX16153, MAX16154, MAX16155: Typical Application Circuit Zoom icon

Technical Docs

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心