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U5020M Datasheet, PDF (1/8 Pages) TEMIC Semiconductors – Digital Window Watchdog Timer
Digital Window Watchdog Timer
U5020M
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 cycli-
cally 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 “Short” trigger window for active mode
“long” trigger window for sleep mode
D Cyclical wake-up of microcontroller in sleep mode
D Trigger input
D Six wake-up inputs
D Reset output
D Enable output
Ordering Information
Extended Type Number
U5020M–FP
Block Diagram
Package
SO16
C
R1
VDD 10 nF
VDD
13
OSC 15
RC
C1
Oscillator
Reset 10
OSC
Remarks
95 10387
Input ts 16
mC
OSC
State machine
9
External
Trigger 11 Input signal
switching
Enable circuitry
conditioning
Mode 12
Power–on
POR
reset
POR Test logic
Wake up 3–8
14
GND
2
1
Test Test
Figure 1. Block diagram with external circuit
TELEFUNKEN Semiconductors
1 (8)
Rev. A3, 27-Feb-97
Preliminary Information