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U5020M Schematic ( PDF Datasheet ) - TEMIC Semiconductors

Teilenummer U5020M
Beschreibung Digital Window Watchdog Timer
Hersteller TEMIC Semiconductors
Logo TEMIC Semiconductors Logo 




Gesamt 8 Seiten
U5020M Datasheet, Funktion
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 Datasheet, Funktion
U5020M
Electrical Characteristics
VDD = 5 V; Tamb = 25 °C; reference point is ground (Pin14); figure 4, unless otherwise specified
Parameters
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁSupply voltage
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁCurrent consumption
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁPower-on reset
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁPower-on reset
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁPower-on reset
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁInputs
Upper threshold (“1”)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁLower threshold (“0”)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁInput voltage range
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁInput current
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁOutput Pin 9
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁMax. output current
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁUpper output voltage (“1”)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁLower output voltage (“0”)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁOutput Pin 10
Max. output current
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁLower output voltage (“0”)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁTiming
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁDebounce period
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁDebounce period
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁMax. trigger pulse period
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁPower-up reset time
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁTime out period
Short disable time
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁShort enable time
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁLong disable time
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁLong enable time
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁLong disable time
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁLong enable time
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁReset out time
Test Conditions / Pins Symbol
WR1 = 66 k
Pin 13
Pin 13
VDD
IDD
Logic functions Pin 13
Threshold
Pin 13
Hysteresis
Pin 13
Pins 3 to 8, 11, 12 and 16
VDD
VPOR
Vhys
VIH
VIL
VIN
Depending on pin
I IN
IOUT = 1mA
IOUT = –1mA
IOUT
VOH
VOL
IOUT = –1mA
IOUT
VOL
Trig, Mode, Pins 11 and 12
Wake-up 1–6, Pins 3 to 8
Input switch = low (0)
Pin 16
Input switch = low (0)
Pin 16
Input switch = high (1)
Pin 16
Input switch = high (1)
Pin 16
to
t1
t2
t3
t4
t5
t4
t5
t6
Min.
4.5
1
4.0
–0.4
–20
2
4.5
2
3
96
Typ. Max. Unit
5.5 V
m100 A
V
3.8 V
100 mV
1.0
VDD + 0.2
20
V
V
V
mA
mA
V
0.5 V
mA
0.5 V
45
201
1112
130
124
71970
30002
1200
400
40
4
128
cyc
cyc
cyc
cyc
cyc
cyc
cyc
cyc
cyc
cyc
cyc
cyc
6 (8) TELEFUNKEN Semiconductors
Preliminary Information
Rev. A3, 27-Feb-97

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