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參數(shù)資料
| 型號(hào)： | MIC2755 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | Battery System Supervisor(電池系統(tǒng)監(jiān)控器（由多路比較器，復(fù)位脈沖發(fā)生器和邏輯門組成）) |
| 中文描述： | 電池系統(tǒng)主管（電池系統(tǒng)監(jiān)控器（由多路比較器，復(fù)位脈沖發(fā)生器和邏輯門組成）） |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 79K |
| 代理商： | MIC2755 |
February 2000
5
MIC2755
MIC2755
Functional Description
Typically the MIC2755 is used to monitor the battery supply
of intelligent circuits such as microcontrollers and micropro-
cessors. By connecting the reset output of a MIC2755 to the
reset input of a
μ
C or
μ
P, the processor will be properly reset
at power-on and during power-down and low battery condi-
tions. The /NMI output provides low-battery warnings to the
system. In addition, a system whose battery voltage declines
below the PTH threshold is held in reset to prevent spurious
operation. Thus the MIC2755 effectively detects three battery
states:
“
battery OK,
”
“
low battery,
”
and
“
dead battery.
”
Reset Output
/RST is an active-low, open-drain digital output. This output
is asserted for a minimum of 700ms at power-on and for a
minimum of 175ms when RTH(/MR) is externally pulled low,
indicating that a manual reset should be initiated. /RST is an
active-low, open-drain digital output and may be wire-ORed
with other open-drain logic signals. Most applications will
require a pull-up resistor on this pin. /RST may be pulled up
to any voltage not exceeding V
/RST(max)
even if this voltage is
higher than V
DD
(see
“
Electrical Characteristics
”
).
Nonmaskable Interrupt Output
/NMI is the output of a comparator that constantly compares
the level on the NTH pin with the internal voltage reference,
V
REF2
. This output is asserted when V
NTH
< V
REF2
, indicating
high-power system operation should not occur; that is, the
battery is low but not dead. Effectively, this function is an
uncommitted comparator with its inverting input connected to
the internal reference, V
REF2
, its noninverting input con-
nected to NTH, and its output on /NMI. This comparator does
not affect any other MIC2755 functions and may be used
independently.
/NMI is an active-low, open-drain digital output and may be
wire-ORed with other open-drain logic signals. Most applica-
tions will require a pull-up resistor on this pin. /NMI may be
pulled up to any voltage not exceeding V
/NMI(max)
even if this
voltage is higher than V
DD
(see
“
Electrical Characteristics
”
).
Micrel
Power-Off Output
This output and the /RST output are asserted and latched
when V
PTH
< V
REF
, indicating a
“
dead battery.
”
The system
is held in reset until the battery is replaced or recharged and
a power-on reset cycle occurs; that is, V
RTH
> V
REF1
. The
/POF output may be used to control a linear or switching
regulator, shutting down the regulator when the battery
reaches it end-of-life voltage.
/POF is an active-low, open-drain digital output and may be
wire-ORed with other open-drain logic signals. Most applica-
tions will require a pull-up resistor on this output. /POF may
be pulled up to any voltage not exceeding V
/POF(max)
even if
this voltage is higher than V
DD
(see
“
Electrical Characteris-
tics
”
).
Power-On Reset
The RTH(/MR) and PTH inputs work together to provide
predictable battery monitoring with user-programmable hys-
teresis and without chatter. The /RST output is asserted for
a minimum of 700ms at power-on. Power-on is determined by
RTH(/MR) exceeding V
REF1
. Once this event has occurred,
the internal logic ignores further transitions on the RTH(/MR)
input, instead monitoring for a low voltage on PTH or the
manual reset condition. If V
PTH
drops below V
REF1
, the /POF
and /RST outputs are asserted and latched, holding the
system in its reset state.
Manual Reset
An internal circuit monitors RTH(/MR), comparing it to an
internal 310mV reference, V
/MRTV
. When RTH(/MR) is pulled
below V
/MRTV,
and V
PTH
is still above V
REF1
, the internal
circuitry initiates a manual reset cycle and asserts /RST for at
least 175ms. A momentary push-button switch is typically
connected such that RTH(/MR) is forced to ground when the
switch contacts close. This switch is internally debounced.
Each closure of the switch longer than t
DBNC
results in a
single output pulse of no less than 175ms and no more than
300ms being generated. (The manual reset pulse is derived
from the same oscillator and counter as t
/RST
. The length of
t
/MR
is always equal to one fourth of t
/RST
.) This prevents a
user who may hold the switch closed from keeping the system
in reset for an extended period of time.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2755BMM | 功能描述:IC SUPERVISOR BATT SYSTEM 8-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:簡單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復(fù)位:低有效 復(fù)位超時(shí):標(biāo)準(zhǔn)傳輸延遲為 60 µs 電壓 - 閥值:3V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:Digi-Reel® 其它名稱:LM8364BALMF30DKR |
| MIC2755BMM TR | 功能描述:IC SUPERVISOR BATT SYSTEM 8-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:簡單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復(fù)位:低有效 復(fù)位超時(shí):標(biāo)準(zhǔn)傳輸延遲為 60 µs 電壓 - 閥值:3V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:Digi-Reel® 其它名稱:LM8364BALMF30DKR |
| MIC2755BMMTS | 制造商:MICREL SEMI 功能描述: |
| MIC2755YMM | 功能描述:監(jiān)控電路 Battery system supervisor; MSOP-08 (Lead Free) RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MIC2755YMM TR | 功能描述:監(jiān)控電路 Battery system supervisor; MSOP-08 (Lead Free) RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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