U5020M-FP TEMIC [TEMIC Semiconductors], U5020M-FP Datasheet

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U5020M-FP

Manufacturer Part Number
U5020M-FP
Description
Digital Window Watchdog Timer
Manufacturer
TEMIC [TEMIC Semiconductors]
Datasheet
TELEFUNKEN Semiconductors
Rev. A3, 27-Feb-97
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
Features
D
D
D
D
D
Ordering Information
Block Diagram
Low current consumption: I
RC–oscillator
Internal reset during power-up and supply voltage
drops (POR)
“Short” trigger window for active mode
“long” trigger window for sleep mode
Cyclical wake-up of microcontroller in sleep mode
Extended Type Number
V
DD
m
U5020M–FP
C
R
1
Wake up
C
Trigger
Input t
1
Mode
Reset
OSC
s
12
16
3–8
10
11
15
DD
< 100
conditioning
Input signal
Oscillator
Preliminary Information
Figure 1. Block diagram with external circuit
OSC
RC
m
A
POR
V
Package
DD
SO16
GND
Power–on
13
14
reset
10 nF
C
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.
D
D
D
D
Trigger input
Six wake-up inputs
Reset output
Enable output
OSC
POR
State machine
2
Test
Test logic
Test
95 10387
1
Remarks
9
Enable
U5020M
switching
External
circuitry
1 (8)

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U5020M-FP Summary of contents

Page 1

... Digital Window Watchdog Timer Description The digital window watchdog timer, U5020M CMOS integrated circuit. In application where safety is critical 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 ...

Page 2

... Wake-up 6 Wake-up 7 Wake- 10635 Figure 2. Pin connections Functional Description Supply, Pin 13 The U5020M requires a stabilized supply voltage " comply with its electrical DD characteristic. An external buffer capacitor may be connected between Pin 13 and GND. RC-Oscillator, Pin 15 The clock frequency, f, can be adjusted with the ...

Page 3

... D the trigger pulse duration is too long, D the trigger pulse is within the disable time there is no trigger pulse Figure 5 shows the pulse diagram with a missing trigger , pulse. 6 U5020M 4.5 V 5.0 V 5.5 V 1000 95 10636 Pin Pin 10 Pin 12 95 10637 ...

Page 4

... U5020M Reset Out Mode Trigger Figure 5. Pulse diagram with no trigger pulse during the short watchdog time Figure 6 shows a correct trigger sequence. The positive edge of the trigger signal starts a new monitoring cycle with the disable time ensure a correct operation of ...

Page 5

... Ambient temperature range Storage temperature range Thermal Resistance Parameters Junction ambient SO16 TELEFUNKEN Semiconductors Rev. A3, 27-Feb-97 Preliminary Information U5020M The watchdog can be switched back from the long to the short watchdog mode with a low potential at the mode pin (Pin 12 ...

Page 6

... U5020M Electrical Characteristics reference point is ground (Pin14); figure 4, unless otherwise specified DD amb Parameters Test Conditions / Pins Supply voltage Current consumption Power-on reset Logic functions Power-on reset Threshold Power-on reset Hysteresis Inputs Pins 11, 12 and 16 Upper threshold (“1”) Lower threshold (“ ...

Page 7

... Package Information Package SO16 Dimensions in mm 0.4 1. TELEFUNKEN Semiconductors Rev. A3, 27-Feb-97 Preliminary Information 10.0 9.85 1.4 0.25 0.10 6.15 8.89 5.85 9 technical drawings according to DIN specifications 8 U5020M 5.2 4.8 3.7 0.2 3.8 13036 7 (8) ...

Page 8

... U5020M Ozone Depleting Substances Policy Statement It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment ...

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