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參數(shù)資料
| 型號(hào)： | MAX807_CWE |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Full-Featured レP Supervisory Circuit with 【1.5eset Accuracy |
| 中文描述： | 全功能レP監(jiān)控電路與精度【1.5eset |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大?。?/td> | 116K |
| 代理商： | MAX807_CWE |
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Battery-Bac kup Mode
Battery backup preserves the contents of RAM in the
event of a brownout or power failure. With a backup
battery installed at BATT, the MAX807 automatically
switches RAM to backup power when V
CC
falls. Two
conditions are required for switchover to battery-back-
up mode: 1) V
CC
must be below the reset threshold; 2)
V
CC
must be below V
BATT
. Table 1 lists the status of
inputs and outputs during battery-backup mode.
Backup-Battery Input
The BATT input is similar to V
CC
, except the PMOS
switch is much smaller. This input is designed to con-
duct up to 20mA to OUT during battery backup. The
on-resistance of the PMOS switch is approximately
13
. Figure 12 shows the two series pass elements
between the BATT input and OUT that facilitates UL
approval. V
BATT
can exceed V
CC
during normal opera-
tion without causing a reset.
Output Supply Voltage
The output supply (OUT) transfers power from V
CC
or
BATT to the μP, RAM, and other external circuitry. At
the maximum source current of 250mA, V
OUT
will typi-
cally be 260mV below V
CC
. Decouple this terminal with
a 0.1μF capacitor.
BAT T ON Output
The battery on (BATT ON) output indicates the status of
the internal battery switchover comparator, which con-
trols the internal V
CC
and BATT switches. For V
CC
greater than V
BATT
(ignoring the small hysteresis
effect), BATT ON typically sinks 3.2mA at 0.4V. In bat-
tery-backup mode, this output sources approximately
5mA. Use BATT ON to indicate battery switchover sta-
tus, or to supply gate or base drive for an external pass
transistor for higher current applications (see Typical
Operating Circuit.
M
Full-Featured μP S upervisory Circ uit with
±1.5% Reset Ac c urac y
______________________________________________________________________________________
13
Figure 12. V
CC
and BATT-to-OUT Switch
MAX807
P
P
P
OUT
V
CC
BATT
0.1
μ
F
CONTROL
CIRCUITRY
Table 1. Input and Output Status in Battery-Backup Mode
The power-fail comparator remains active in battery-backup mode for V
CC
≥
4V. Below 4V, PFO is forced low.
Battery switchover comparator monitors V
CC
for active switchover.
PFO
V
CC
2
3
WDI is ignored and goes high impedance.
WDI
4
MR is ignored.
Logic low.
MR
6
7
Logic high; the open-circuit output voltage is equal to V
CC
.
Logic low.
RESET
RESET
8
9
LOW LINE
Ground—0V reference for all signals.
GND
5
Logic high. The open-circuit output voltage is equal to V
CC
.
Logic high. The open-circuit output voltage is equal to V
BATT
.
WDO
CE OUT
10
11
High impedance.
Logic high. The open-circuit output voltage is equal to V
BATT
.
CE IN
BATT ON
12
13
Supply current is 1μA maximum for V
BATT
≤
2.8V.
Logic high when V
BATT
exceeds 2.285V. Valid for V
CC
≥
4V. Below 4V, BATT OK is forced low.
BATT
BATT OK
14
15
PIN
1
OUT is connected to BATT through two internal PMOS switches in series.
OUT
16
The power-fail comparator remains active in battery-backup mode for V
CC
≥
4V.
PFI
FUNCTION
NAME
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX807L | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Full-Featured レP Supervisory Circuit with 【1.5eset Accuracy |
| MAX807LCPE | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)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(kāi)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 |
| MAX807LCPE+ | 功能描述:監(jiān)控電路 Full-Featured uPower Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)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(kāi)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 |
| MAX807LCUE | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)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(kāi)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 |
| MAX807LCUE+ | 功能描述:監(jiān)控電路 Full-Featured uPower Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)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(kāi)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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