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IIMP1832 Schematic ( PDF Datasheet ) - IMP Inc
| Teilenummer | IIMP1832 |
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| Beschreibung | 3.3V P Power Suppl Monitor and Reset Circuit | |
| Hersteller | IMP Inc | |
| Logo |  |
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Gesamt 7 Seiten 
IMP1832
POWER MANAGEMENT
3.3V µP Power Supply
Monitor and Reset Circuit
– Selectable Trip-Point Tolerance and
Watchdog Period
– Push-Button Reset
– Push-Pull Reset Outputs
The IMP1832 microprocessor supervisor can halt and restart a “hung-
up” or “stalled” microprocessor, restart a microprocessor after a power
failure, and debounce a manual push-button microprocessor reset
switch. The IMP1832 features over 40% lower supply current than the
pin compatible Dallas Semiconductor DS1832.
Precision temperature compensated reference and comparator circuits
monitor the 3.3V, VCC input voltage. During power-up or when the VCC
power supply falls outside selectable tolerance limits, both RESET and
RESET become active. When VCC rises above the threshold voltage, the
reset signals remain active for an additional 250ms minimum, allowing
the power supply and system microprocessor to stabilize. The trip point
tolerance signal, TOL, selects the trip level tolerance to be either 10- or
20-percent.
RESET and RESET outputs are push-pull.
A debounced manual reset input, PBRST, activates the reset outputs for
a minimum period of 250ms.
Key Features
x Pin compatible with the Dallas Semiconductor
DS1832
— Over 40% lower supply current
x 3.3V supply monitor
x Push-pull output
x Selectable watchdog period
x Debounce manual push-button reset input
x Precision temperature-compensated voltage
reference and comparator
x Power-up, power-down and brownout detection
x 250ms minimum reset time
x Active LOW and HIGH reset signal
x Selectable trip point tolerance: 10% or 20%
x Low-cost 8-pin DIP/SO and 8-pin MicroSO
packages
x Wide operating temperature – 40°C to +85°C
Also included is a watchdog timer to stop and restart a
microprocessor that is “hung-up”. Three watchdog time-
out periods are selectable: 150ms, 610ms and 1,200ms. If the
ST input is not strobed LOW before the time-out period
expires, a reset is issued.
Devices are available in 8-pin DIP, 8-pin SO and compact
8-pin MicroSO packages.
Block Diagram
VCC
TOL
PBRST
TD
ST
8 IMP1832
3 10%/20% Tolerance
Selection
Reference
VCC
40k9
1 Push Button
Debounce
2 Watchdog
Timebase Selection
7 Watchdog
Transition Detector
+
–
Reset &
Watchdog Timer
© 1999 IMP, Inc.
408-432-9100/www.impweb.com
VCC
6
RESET
VCC
5
RESET
4
GND
1832_02.eps
1
 
IMP1832
Package Dimensions
MicroSO (8-Pin)
a
E1 E
D
e
b
A2
A
A1
0.10mm
0.004in
L
C
MicroSO (8-Pin).eps
SO (8-Pin)
EH
0°– 8°
L
D
e
B
A
A1
C
SO (8-Pin).eps
Plastic DIP (8-Pin)
D1
A A2
D
E
E1
Inches
Millimeters
Min Max Min Max
MicroSO (8-Pin)*
A –––––
0.0433
––––
1.10
A1 0.0020
0.0059
0.050
0.15
A2 0.0295
0.0374
0.75
0.95
b 0.0098
0.0157
0.25
0.40
C 0.0051
0.0091
0.13
0.23
D 0.1142
0.1220
2.90
3.10
e 0.0256 BSC
0.65 BSC
E 0.193 BSC
4.90 BSC
E1 0.1142
0.1220
2.90
3.10
L 0.0157
0.0276
0.40
0.70
a 0° 6° 0° 6°
SO (8-Pin)**
A 0.053
0.069
1.35
1.75
A1 0.004
0.010
0.10
0.25
B 0.013
0.020
0.33
0.51
C 0.007
0.010
0.19
0.25
e 0.050
1.27
E 0.150
0.157
3.80
4.00
H 0.228
0.244
5.80
6.20
L 0.016
0.050
0.40
1.27
D 0.189
0.197
4.80
2.00
Plastic DIP (8-Pin)***
A –––––
0.210
––––
5.33
A1 0.015
–––––
0.38
–––––
A2 0.115
0.195
2.92
4.95
b 0.014
0.022
0.36
0.56
b2 0.045
0.070
1.14
1.78
b3 0.030
0.045
0.80
1.14
D 0.355
0.400
9.02
10.16
D1 0.005
–––––
0.13
–––––
E 0.300
0.325
7.62
8.26
E1 0.240
0.280
6.10
7.11
e 0.100
–––––
2.54
eA 0.300
–––––
7.62
eB –––––
0.430
–––––
10.92
eC –––––
0.060
L 0.115
0.150
*** JEDEC Drawing MO-187AA
*** JEDEC Drawing MS-112AA
*** JEDEC Drawing MS-001BA
2.92
3.81
1832_t04.at3
L A1
e
6
0°–15°
b2
b
C
eA
eB
Plastic DIP (8-Pin)a.eps
408-432-9100/www.impweb.com
© 1999 IMP, Inc.
6 Page | ||
| Seiten | Gesamt 7 Seiten | |
| PDF Download | [ IIMP1832 Schematic.PDF ] | |
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