DS1231

电源监测器


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说明

With precise, temperature-compensated comparators, the DS1231 Power Monitor Chip monitors input power and a 5V system power supply. If unsafe voltages are detected, a nonmaskable interrupt sends a warning signal to the processor in advance of power failure. Processing is unconditionally halted when power falls below a user-selectable 5% or 10% threshold level, with time to shutdown proportional to the available hold-up time of the power supply. Upon return of power, the DS1231 maintains reset until power conditions stabilize.

The DS1231 enhances system reliability by closely monitoring both processor and upstream power levels, warning of impending failure, and automatically suspending and restarting processor operation. An input sense also supports a connection to switched inputs such as an opto-isolator for LED function. All external reset components (i.e., pull-up resistor and delay timing capacitor) are contained in one package, saving space and cost.
DS1231:原理框图 DS1231:原理框图 放大+

关键特性

  • Monitors input and power supply and warns of impending failure
  • Provides orderly shutdown
  • Initiates and holds processor reset until levels are unsafe
  • Tolerance threshold levels can be set for 5% or 10%
  • Automatically restarts processor on power-up
  • Pauses restart until system stabilizes
  • Operating range: 0°C to +70°C (DS1231 and DS1231S)
    -40°C to +85°C (DS1231-N and DS1231S-N)
  • Optional active-low NMI Hysteresis (200mV = "-20", 350mV = "-35", 500mV = "-50")
Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
DS1231 3.3 to 5.5
Active Low
Open Drain
85ms to 300msNo WatchdogPower Fail Comparator/Low Battery Detect2.52000
PDIP/8
SOIC (W)/16
$3.83 @1k
查看所有Supervisors (1 Monitored Voltage) (256)
Pricing Notes:
价格仅供参考,用于同类产品的比较。所提供报价为美元,需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题,请参考:价格与供货网站或与指定代理商联系。

型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C  

备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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