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U5020M-FP Datasheet

  • U5020M-FP

  • Digital Window Watchdog Timer

  • 110.68KB

  • 8頁

  • TEMIC

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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 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: I
DD
< 100
m
A
D
RC鈥搊scillator
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
鈥淪hort鈥?trigger window for active mode
鈥渓ong鈥?trigger window for sleep mode
D
Cyclical wake-up of microcontroller in sleep mode
Ordering Information
Extended Type Number
U5020M鈥揊P
Package
SO16
Remarks
Block Diagram
C
R
1
V
DD
C
1
Reset 10
Input t
s
16
OSC
Trigger 11
Input signal
conditioning
POR
State machine
9
Enable
Power鈥搊n
reset
POR
Test logic
External
switching
circuitry
OSC
15
RC
Oscillator
OSC
V
DD
10 nF
13
95 10387
m
C
Mode 12
Wake up 3鈥?
14
GND
2
Test
1
Test
Figure 1. Block diagram with external circuit
TELEFUNKEN Semiconductors
Rev. A3, 27-Feb-97
1 (8)
Preliminary Information

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