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U5020M PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 U5020M
기능 Digital Window Watchdog Timer
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U5020M 데이터시트, 핀배열, 회로
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
OSC 15
RC
13
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
21
Test Test
Figure 1. Block diagram with external circuit
TELEFUNKEN Semiconductors
Rev. A3, 27-Feb-97
Preliminary Information
1 (8)




U5020M pdf, 반도체, 판매, 대치품
U5020M
VDD
Reset Out
Mode
Trigger
to t1
t2
t3
Figure 5. Pulse diagram with no trigger pulse during the short watchdog time
Pin 13
Pin 10
Pin 12
Pin 11
95 10638
Figure 6 shows a correct trigger sequence. The positive
edge of the trigger signal starts a new monitoring cycle
with the disable time, t2. To ensure a correct operation of
the microcontroller the watchdog needs to be triggered
three times correctly before it sets its enable output. This
feature is used to activate or deactivate safety critical
components, which have to be switched to a certain
condition (emergency status) in the case of a micro-
controller malfunction. As soon as there is an incorrect
trigger sequence the enable signal is reset and it takes
again a three correct trigger sequence before enable is re-
set.
Microcontroller in Sleep Mode
Monitoring with the “Long” Trigger
Window
The long watchdog mode allows cyclical wake up of the
micro during the sleep mode. Like in the short watchdog
mode there is a disable time, t4, and an enable time, t5, in
which a trigger signal is accepted. The watchdog can be
switched from the short trigger window to the long trigger
window with a “high” potential at the mode pin (Pin 12).
In contrast to the short watchdog mode the time periods
are now much longer and the enable output remains
inactive that other components can be switched off to
effect a further decrease in current consumption. As soon
as a wake-up signal at one of the 6 wake up inputs (Pins
3 to 8) is detected, the long watchdog mode ends, a reset
pulse wakes-up the sleeping microcontroller and the
normal monitoring cycle starts with the mode switch-over
time.
With the help of a low or high potential at Pin 16 (time
switch) the long watchdog time can be selected in two
values.
VDD
Reset Out
Mode
Trigger
Enable
t0 t1
t2
Pin 13
Pin 10
t3
t2
Pin 12
Pin 11
t trig
95 10639
Figure 6. Pulse diagram of a correct trigger sequence during the short watchdog time
Pin 9
4 (8) TELEFUNKEN Semiconductors
Preliminary Information
Rev. A3, 27-Feb-97

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U5020M 전자부품, 판매, 대치품
Package Information
Package SO16
Dimensions in mm
10.0
9.85
0.4
1.27
16
8.89
U5020M
1.4
0.25
0.10
9
5.2
4.8
3.7
3.8
6.15
5.85
0.2
technical drawings
according to DIN
specifications
13036
18
TELEFUNKEN Semiconductors
Rev. A3, 27-Feb-97
Preliminary Information
7 (8)

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관련 데이터시트

부품번호상세설명 및 기능제조사
U5020M

Digital Window Watchdog Timer

TEMIC Semiconductors
TEMIC Semiconductors
U5020M-FP

Digital Window Watchdog Timer

TEMIC Semiconductors
TEMIC Semiconductors

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