SGM819S
SGM819S is Watchdog Timer manufactured by SG Micro.
DESCRIPTION
The SGM819S 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 SGM819S 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 SGM819S 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/SGM819S-mn
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
- 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
Industrial Equipment Telemunications Safety Applications Networking Medical Equipment UPS System
TYPICAL APPLICATION
1.7V to 5.5V
0.1µF
WDI n WDO
10kΩ n EN GND
5V
5V System GND
Figure 1. Typical Application Circuit
SG Micro Corp .sg-micro.
JULY...
