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ADM8318 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADM8318
Beschreibung (ADM8316 - ADM8322) Supervisory Circuits
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
ADM8318 Datasheet, Funktion
Data Sheet
Supervisory Circuits with Watchdog
and Manual Reset in 5-Lead SOT-23
ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
FEATURES
26 reset threshold options
2.5 V to 5 V in 100 mV increments
4 reset timeout options
1 ms, 20 ms, 140 ms, and 1120 ms (minimum)
4 watchdog timeout options
6.3 ms, 102 ms, 1.6 sec, and 25.6 sec (typical)
Manual reset input
Multiple reset output options
Low power consumption
Specified over wide temperature range (−40°C to +125°C)
Qualified for automotive applications
5-lead SOT-23 package
APPLICATIONS
Automotive infotainment
Microprocessor systems
Computers
Controllers
Intelligent instruments
Portable equipment
FUNCTIONAL BLOCK DIAGRAMS
ADM8316
VCC
VREF
RESET
GENERATOR
VCC
RESET
MR DEBOUNCE
WATCHDOG
DETECTOR
GND
WDI
Figure 1. ADM8316
ADM8320
VCC
VREF
MR DEBOUNCE
RESET
GENERATOR
WATCHDOG
DETECTOR
RESET
GND
WDI
Figure 2. ADM8320
GENERAL DESCRIPTION
The ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/
ADM8322 are supervisory circuits that monitor power supply
voltage levels and code execution integrity in microprocessor-
based systems. As well as providing power-on reset signals, an
on-chip watchdog timer can reset the microprocessor if it fails
to strobe within a preset timeout period. A reset signal can also
be asserted by an external push-button switch through a manual
reset input. The six devices feature different combinations of
watchdog input, manual reset input, and output stage
configuration, as shown in Table 6.
Each device is available in a choice of 26 reset threshold options
ranging from 2.5 V to 5 V in 100 mV increments. There are also
four reset timeout options of 1 ms, 20 ms, 140 ms, and 1120 ms
(minimum) and four watchdog timeout options of 6.3 ms, 102 ms,
1.6 sec, and 25.6 sec (typical).
The ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/
ADM8322 are available in 5-lead SOT-23 packages and
typically consume only 10 µA, making them suitable for use in
low power, portable applications.
Rev. 0
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Tel: 781.329.4700
©2013 Analog Devices, Inc. All rights reserved.
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ADM8318 Datasheet, Funktion
ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
Data Sheet
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
RESET 1 ADM8316/ 5 VCC
GND 2 ADM8320
TOP VIEW
MR 3 (Not to Scale) 4 WDI
Figure 3. ADM8316/ADM8320 Pin Configuration
Table 3. ADM8316/ADM8320 Pin Function Descriptions
Pin No. Mnemonic Description
1 RESET Active Low Reset Output. Asserted whenever VCC is below the reset threshold, VTH. This pin is a push-pull
output stage for the ADM8316 and an open-drain output stage for the ADM8320.
2 GND
Ground.
3 MR
Manual Reset Input. This is an active low input that, when forced low for greater than the glitch filter time,
generates a reset. It features a 75 kΩ internal pull-up resistor.
4 WDI
Watchdog Input. Generates a reset if the logic level on the pin remains low or high for the duration of the
watchdog timeout. The timer is cleared if a logic transition occurs on this pin or if a reset is generated. Leave
this pin floating to disable the watchdog timer.
5 VCC
Power Supply Voltage Being Monitored.
RESET 1 ADM8318/ 5 VCC
GND 2 ADM8321
TOP VIEW
RESET 3 (Not to Scale) 4 WDI
Figure 4. ADM8318/ADM8321 Pin Configuration
Table 4. ADM8318/ADM8321 Pin Function Descriptions
Pin No. Mnemonic Description
1 RESET Active Low Reset Output. Asserted whenever VCC is below the reset threshold, VTH. This pin is a push-pull
output stage for the ADM8318 and an open-drain output stage for the ADM8321.
2 GND
Ground.
3 RESET
Active High Push-Pull Reset Output.
4 WDI
Watchdog Input. Generates a reset if the logic level on the pin remains low or high for the duration of the
watchdog timeout. The timer is cleared if a logic transition occurs on this pin or if a reset is generated. Leave
this pin floating to disable the watchdog timer.
5 VCC
Power Supply Voltage Being Monitored.
RESET 1 ADM8319/ 5 VCC
GND 2 ADM8322
TOP VIEW
RESET 3 (Not to Scale) 4 MR
Figure 5. ADM8319/ADM8322 Pin Configuration
Table 5. ADM8319/ADM8322 Pin Function Descriptions
Pin No. Mnemonic
Description
1 RESET
Active low Reset Output. Asserted whenever VCC is below the reset threshold, VTH. This pin is a push-pull
output stage for the ADM8319 and an open-drain output stage for the ADM8322.
2 GND
Ground.
3 RESET
Active High Push-Pull Reset Output.
4 MR
Manual Reset Input. This is an active low input that, when forced low for greater than the glitch filter time,
generates a reset. It features a 75 kΩ internal pull-up resistor.
5 VCC
Power Supply Voltage Being Monitored.
Rev. 0 | Page 6 of 16
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ADM8318 pdf, datenblatt
ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
Data Sheet
OPTIONS
Table 6. Selection Table
Device No.
ADM8316
ADM8318
ADM8319
ADM8320
ADM8321
ADM8322
Watchdog
Yes
Yes
No
Yes
Yes
No
Manual Reset
Yes
No
Yes
Yes
No
Yes
RESET
Push-pull
Push-pull
Push-pull
Open-drain
Open-drain
Open-drain
Output Stage
RESET
No
Push-pull
Push-pull
No
Push-pull
Push-pull
Table 7. Reset Timeout Options
Suffix
Minimum
A1
B 20
C 140
D 1120
Typical
1.4
28
200
1600
Maximum
1.8
36
260
2080
Unit
ms
ms
ms
ms
Table 8. Watchdog Timeout Options
Suffix
Minimum
W 4.5
X 72
Y 1.12
Z 18.0
Typical
6.3
102
1.6
25.6
Maximum
8.1
132
2.24
33.2
Unit
ms
ms
sec
sec
Table 9. Reset Voltage Threshold Options
Reset Threshold Number
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
Minimum
4.950
4.851
4.752
4.653
4.584
4.455
4.346
4.257
4.158
4.059
3.960
3.861
3.762
3.663
3.564
3.465
3.366
3.267
3.168
3.049
2.970
2.901
2.772
2.673
2.604
2.475
TA = 25°C
Typical
5.000
4.900
4.800
4.700
4.630
4.500
4.390
4.300
4.200
4.100
4.00
3.900
3.800
3.700
3.600
3.500
3.400
3.300
3.200
3.080
3.000
2.930
2.800
2.700
2.630
2.500
Maximum
5.050
4.949
4.848
4.747
4.676
4.545
4.434
4.343
4.242
4.141
4.040
3.939
3.838
3.737
3.636
3.535
3.434
3.333
3.232
3.111
3.030
2.959
2.828
2.727
2.656
2.525
TA = −40°C to +125°C
Minimum
Maximum
4.925
5.075
4.826
4.974
4.728
4.872
4.629
4.771
4.560
4.700
4.432
4.568
4.324
4.456
4.235
4.365
4.137
4.263
4.038
4.162
3.940
4.060
3.841
3.959
3.743
3.857
3.644
3.756
3.546
3.654
3.447
3.553
3.349
3.451
3.250
3.350
3.152
3.248
3.033
3.127
2.955
3.045
2.886
2.974
2.758
2.842
2.659
2.741
2.590
2.670
2.462
2.538
Rev. 0 | Page 12 of 16
Unit
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
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