SGM819S-FAQ Datasheet | SG Micro

DESCRIPTION The SGM819Sx Q 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 n WDO output. In normal conditions, the WDI is toggled within the preset timeout period called t WD in order to clear the watchdog timer. However, if an error event occurs and the watchdog timer is not reset within t WD, the n WDO is asserted to send out the alarm signal. The SGM819Sx Q has an enable pin (n EN) to control the device to turn on/off the watchdog function. To turn on the watchdog function, just connect n EN 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 SGM819Sx Q is available in a Green SOT-23-5 package. It operates over the junction temperature range of -40℃ to +125℃. DEVICE DESCRIPTION Model: SGM819S-m Q/SGM819S-mn Q Watchdog Timeout Period Options Option Code: “m” A DE F Watchdog Timeout Period 3.4ms 6.8ms 108.8ms 1.7s 7.0s 27.9s Watchdog Active Time Options Option Code: “n” Watchdog Active Time A 27.2ms B 217.6ms 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 n WDO Output - Available in a Green SOT-23-5 Package APPLICATIONS Automotive Applications Industrial Equipment Telemunications Safety Applications Networking Medical Equipment UPS System TYPICAL APPLICATION 1.7V to 5.5V 0.1µF SGM819Sx Q 10kΩ WDI n WDO n EN...