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PDF U5020M-FP Data sheet ( Hoja de datos )
| Número de pieza | U5020M-FP | |
| Descripción | Digital Window Watchdog Timer | |
| Fabricantes | TEMIC Semiconductors | |
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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)
1 page  
U5020M
Figure 7 shows the switch-over from the short to the long
watchdog mode. The wake up signal during the enable
time, t5, activates a reset pulse, t6.
The watchdog can be switched back from the long to the
short watchdog mode with a low potential at the mode pin
(Pin 12).
Reset out
t6 t1
Pin 10
Wake-up
Mode
Trigger
t4
t2
Pins 3 to 8
t5
Pin 12
Pin 11
Enable
Figure 7. Pulse diagram of the long watchdog time
95 10640
Pin 9
Application Hint
In order to prevent the IC from an undesired reset output signal which may be caused by transcients on the supply under
certain conditions a pc board connection from Pin 2 to GND is strongly recommended.
Absolute Maximum Ratings
Supply voltage
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁOutput current
Parameters
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁInput voltage
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁAmbient temperature range
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁStorage temperature range
Symbol
VDD
IOUT
VIN
Tamb
Tstg
Value
"6.5
2
–0.5 V to VDD + 0.5 V
–40 to +85
–55 to +150
Unit
V
mA
V
°C
°C
Thermal Resistance
ÁÁJÁÁunctÁÁionÁÁambÁÁienÁÁt ÁÁÁÁParaÁÁSmOet1ÁÁe6rsÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁSyRmÁÁthJbAoÁÁl ÁÁÁÁÁÁÁÁV1a6lu0ÁÁe ÁÁÁÁÁÁÁÁKUÁÁ/nWitÁÁÁÁ
TELEFUNKEN Semiconductors
Rev. A3, 27-Feb-97
Preliminary Information
5 (8)
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet U5020M-FP.PDF ] | |
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