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參數(shù)資料
| 型號： | ASM1832U |
| 廠商： | ALLIANCE SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 3.3V UP Power Supply Monitor and Reset Circuit |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| 封裝： | MICRO, SOP-8 |
| 文件頁數(shù)： | 3/9頁 |
| 文件大?。?/td> | 259K |
| 代理商： | ASM1832U |
3 of 9
Notice: The information in this document is subject to change without notice
3.3V μP Power Supply Monitor and Reset Circuit
ASM1832
rev 1.5
February 2005
Detailed Description
The
microcontroller power supply and issues reset signals, both
active HIGH and active LOW, that halt processor operation
whenever the power supply voltage levels are outside a
predetermined tolerance.
ASM1832
monitors
the
microprocessor
or
RESET and RESET outputs
RESET and RESET signals are active for a minimum of
250ms after the supply has returned to in-tolerance level.
This allows the power supply and monitored processor to
stabilize before instruction execution is allowed to begin.
Trip Point Tolerance Selection
The TOL input is used to determine the level V
CC
can vary
below 3.3V without asserting a reset. With TOL conected to
V
CC
, RESET and RESET become active whenever V
CC
falls
below 2.64V. RESET and RESET become active when the
V
CC
falls below 2.98V if TOL is connected to ground.
After V
CC
has risen above the trip point set by TOL, RESET
and RESET remain active for a minimum time period of
250ms. On power-down, once V
CC
falls below the reset
threshold RESET stays LOW and is guaranteed to be 0.4V or
less until V
CC
drops below 1.2V. The reset output on the
ASM1832 uses a push-pull drive stage that can maintain a
valid output below 1.2V. To sink current with V
CC
below 1.2V,
a resistor can be connected from the reset pin (RESET) to
Ground. This configuration will give a valid value on the reset
output with V
CC
approaching 0V. During both power up and
down, the configuration will draw current when the RESET is
in the high state. The value of 100K
should be adequate to
maintain a valid condition. The active HIGH reset signal is
valid down to a V
CC
level of 1.2V also.
.
Application Information
Manual Reset Operation
Push-button switch input, PBRST, allows the user to override
the internal trip point detection circuits and issue reset
Microprocessor
RESET
RESET
ASM1832
100k
Tolerance
Select
Tolerance
TRIP Point Voltage
(V)
Min
Nom
Max
TOL = V
CC
20%
2.47
2.55
2.64
TOL = GND
10%
2.80
2.88
2.97
~
~
~
V
OH
V
OL
t
RPU
RESET
RESET
V
CCTP
(MIN)
V
CCTP
(MAX)
V
CCTP
t
R
V
CC
Figure 1: Timing Diagram : Power Up
~
~
~
V
OH
V
OL
V
CCTP
(MAX)
V
CCTP
V
CCTP
(MIN)
RESET
RESET
t
F
V
CC
t
RPD
Figure 2: Timing Diagram : Power Down
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| ASM1832UF | 3.3V UP Power Supply Monitor and Reset Circuit |
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| ASM1834U-T | Dual 5V and 3.3V uP Power Supply Supervisor with Manual Reset |
| ASM1834UF | Dual 5V and 3.3V uP Power Supply Supervisor with Manual Reset |
| ASM1834UF-T | Dual 5V and 3.3V uP Power Supply Supervisor with Manual Reset |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ASM1832UF | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:3.3V UP Power Supply Monitor and Reset Circuit |
| ASM1834 | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Dual 5V and 3.3V uP Power Supply Supervisor with Manual Reset |
| ASM1834A | 制造商:PULSECORE 制造商全稱:PulseCore Semiconductor 功能描述:Dual 5V and 3.3V μP Power Supply Supervisor with Manual Reset |
| ASM1834AF | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Dual 5V and 3.3V uP Power Supply Supervisor with Manual Reset |
| ASM1834AF-T | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Dual 5V and 3.3V uP Power Supply Supervisor with Manual Reset |
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