Watchdog Timer Circuit for Automotive Applications.
SGM819SxQ
SGM819SxQ.pdf
SGM819SxQ.pdf
No.14081
FEATURES
• AEC-Q100 Qualified for Automotive Applications
Device Temperature Grade 1
TA = -40℃ to +125℃
• Current Consumption: 3.5μA (TYP)
• Six Selectable Watchdog Timeout Periods: 3.4ms,
6.8ms, 108.8ms, 1.7s, 7.0s and 27.9s
• Two Selectable Watchdog Active Time: 27.2ms and 217.6ms
• Watchdog Timer Accuracy: ±20%
• Active-Low Enable Input
• Open-Drain nWDO Output
• Available in a Green SOT-23-5 Package
DESCRIPTION
The SGM819SxQ is an independent watchdog timer circuit. It can be used to guard against system failures due to hardware types like peripherals errors and bus occupancy or software types like infinite code execution in a loop.
This device has a WDI input and an nWDO output. In normal conditions, the WDI is toggled within the preset timeout period called tWD in order to clear the watchdog timer. However, if an error event occurs and the watchdog timer is not reset within tWD, the nWDO is asserted to send out the alarm signal.
The SGM819SxQ has an enable pin (nEN) to control the device to turn on/off the watchdog function. To turn on the watchdog function, just connect nEN pin which has a built-in pull-down resistor to GND or leave it floating.
The device is AEC-Q100 qualified (Automotive Electronics Council (AEC) standard Q100 Grade 1) and it is suitable for automotive applications.
The SGM819SxQ is available in a Green SOT-23-5 package. It operates over the junction temperature range of -40℃ to +125℃.
APPLICATION CIRCUIT
PIN CONFIGUTION
