Digital Window Watchdog Timer
U5020M
Digital Window Watchdog Timer
Description
The digital window watchdog timer, U5020M, is a CMOS integrated circuit...
Description
U5020M
Digital Window Watchdog Timer
Description
The digital window watchdog timer, U5020M, is a CMOS integrated circuit. In application where safety is critical, it is especially important to monitor the microcontroller. Normal microcontroller operation is indicated by a cyclically transmitted trigger signal, which is received by a window watchdog timer within a defined time window. A missing or a wrong trigger signal makes the watchdog timer reset the microcontroller. The IC is tailored for microcontrollers which can work in both full-power and sleep mode. With an additional voltage monitoring (power-on reset and supply voltage drop reset) U5020M offers a complete monitoring solution for microsystems in automotive and industrial applications.
Features
D Low current consumption: IDD < 100 mA D RC–oscillator D Internal reset during power-up and supply voltage
drops (POR)
D Trigger input D Six wake-up inputs D Reset output D Enable output
D “Short” trigger window for active mode
“long” trigger window for sleep mode
D Cyclical wake-up of microcontroller in sleep mode
Ordering Information
Extended Type Number U5020M–FP Package SO16 Remarks
Block Diagram
C R1 VDD C1 Reset 10 Input ts 16 OSC Trigger 11 Input signal conditioning POR State machine 9 Enable Power–on reset POR Test logic External switching circuitry OSC 15 RC Oscillator OSC VDD 10 nF 13
95 10387
mC
Mode 12 Wake up 3–8
14 GND
2 Test
1 Test
Figure 1. Block diagram with external circuit
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