MIC1232

The MIC1232 is a multifunction circuit which monitors microprocessor activity, external reset and power supplies in microprocessor based systems. The circuit functions include a watchdog time, power supply monitor, microprocessor reset, and manual pushbutton reset input.

The power supply line is monitored with a comparator and an internal voltage reference. /RST is forced low when an out-of-tolerance condition exists and remains asserted for at least 250ms after VCC rises above the threshold voltage (4.5V or 4.75V). The /RST pin will remain logic low with VCC as low as 1.4V.

The Watchdog input (/ST) monitors µP activity and will assert /RST if no µP activity has occurred with in the watchdog timeout period. The watchdog timeout period is selectable with nominal period of 150, 600, 1200 milliseconds.

Features
  • Power OK/Reset time delay, 250ms min.
  • Watchdog timer, 150ms, 600ms, or 1.2s typical
  • Precision supply voltage monitor, select between 5% or 10% of supply voltage
  • Available in 8-pin surface mount (SO)
  • Debounced External reset input
  • Low supply current, <18µA typical
Parameter
Parameter Name Value Value
Watchdog Timer Yes Yes
Typical Reset Pulse Width (ms) 250 250
Reset Type Active-High/Low Push-Pull Active-High/Low Push-Pull
Typical Supply Current (uA) 18 18
Nominal Reset Voltage (V) 4.37, 4.62 4.37, 4.62
Product Type Single Voltage Monitor Single Voltage Monitor
Documents
MIC1232 - 5V Voltage Supervisor w/ Man Reset, Watchdog Timer & Dual Reset OutputData Sheets11/05/2015195KB
Micrel AN 15 - Designing BLDC Motor ControlAppNote10/01/20151050KB
Ordering Information
Part NumberLeadsPackage TypeTemp RangePacking1+26+100+1000+5000+
MIC1232MY8SOIC-40C to +85CTUBE0.950.790.720.600.55
MIC1232MY-TR8SOIC-40C to +85CT/R0.950.790.720.600.55
MIC1232NY8PDIP-40C to +85CTUBE1.451.211.100.920.85
RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
MIC1232NY0.4867000.9000008PDIP.300inMatte Tine3
MIC1232MY0.0750000.1632658SOIC3.90mm(.150in)NiPdAue4
MIC1232MY-TR0.0750000.2500008SOIC3.90mm(.150in)NiPdAue4
MIC1232 - 5V Voltage Supervisor w/ Man Reset, Watchdog Timer & Dual Reset Output MIC1232
Micrel AN 15 MIC6270