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參數(shù)資料
| 型號(hào)： | MAX804TESA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 3.0V/3.3V Microprocessor Supervisory Circuits |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 100K |
| 代理商： | MAX804TESA |
Watc hdog Input
(MAX 690_/802_/804_/805_)
The watchdog circuit monitors the μP’s activity. If the μP
does not toggle the watchdog input (WDI) within 1.6sec,
a reset pulse is triggered. The internal 1.6sec timer is
cleared by either a reset pulse or by a transition (low-to-
high or high-to-low) at WDI. If WDI is tied high or low, a
WD
plus t
RS
).
As long as reset is asserted, the timer remains cleared
and does not count. As soon as reset is deasserted,
the timer starts counting. Unlike the 5V MAX690 family,
the watchdog function
cannot
be disabled.
Power-Fail Comparator
The PFI input is com,–——O goes low. The power-fail
PFI is less than V
comparator is intended for use as an undervoltage
detector to signal a failing power supply. However, the
comparator does not need to be dedicated to this
function because it is completely separate from the rest
of the circuitry.
The power-fail comparator turns off and–——O goes low
when V
falls below V
on power-down. The power-
fail comparator turns on as V
crosses V
on
power-up. If the comparator is not used, connect PFI to
connected to–M—–on the MAX704_/MAX806_ so that a
low voltage on PFI will generate a reset (Figure 5b).
M
3.0V /3.3V Mic roproc essor S upervisory Circ uits
_______________________________________________________________________________________
7
V
BATT
RESET
(RESET)
WDI
V
CC
MR
BATTERY
SWITCHOVER
COMPARATOR
RESET
COMPARATOR
RESET
GENERATOR
WATCHDOG
TIMER
BATTERY
SWITCHOVER
CIRCUITRY
MAX690T/S/R
MAX704T/S/R
MAX802T/S/R
MAX804T/S/R
MAX805T/S/R
MAX806T/S/R
PFO
V
OUT
PFI
V
PFT
1.237V
1.237V
**
*
*
POWER-FAIL
COMPARATOR
* MAX690T/S/R, MAX802T/S/R, MAX804T/S/R, MAX805T/S/R ONLY
** MAX704T/S/R, MAX806T/S/R ONLY
( ) MAX804T/S/R, MAX805T/S/R ONLY
V
BATT
= 3.6V
3.0V OR 3.3V
V
SW
t
WP
RESET
PFO
V
CC
( ) MAX804T/S/R, MAX805T/S/R ONLY, RESET EXTERNALLY PULLED UP TOV
CC
V
OUT
V
SW
(RESET)
3.0V OR 3.3V
3.0V OR 3.3V
0V
V
RST
V
BATT
= PFI = 3.6V
I
OUT
= 0mA
Figure 1. Block Diagram
Figure 2. Timing Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX804TMJA | 3.0V/3.3V Microprocessor Supervisory Circuits |
| MAX802SCPA | 3.0V/3.3V Microprocessor Supervisory Circuits |
| MAX802LCPA | Microprocessor Supervisory Circuits |
| MAX802LCSA | Microprocessor Supervisory Circuits |
| MAX802LESA | RES 2.21K-OHM 1% 0.1W 100PPM THICK-FILM SMD-0603 5K/REEL-7IN-PA |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX804TESA+ | 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 |
| MAX804TESA+T | 功能描述:監(jiān)控電路 NULL 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 |
| MAX804TESA-T | 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 |
| MAX804TMJA | 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 |
| MAX805 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述: |
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