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參數(shù)資料
| 型號： | AS705 |
| 廠商： | Alliance Semiconductor Corporation |
| 英文描述： | Low Power uP Supervisor Circuits |
| 中文描述： | 低功耗μP監(jiān)控電路 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 198K |
| 代理商： | AS705 |
6 of 16
Notice: The information in this document is subject to change without notice
Low Power μP Supervisor Circuits
ASM705 / 706 / 707 / 708
ASM813L
rev 1.5
February 2005
Monitoring a Negative Voltage
The Power-Fail circuitry can also monitor a negative supply
rail. When the negative rail is OK, PFO will be LOW, and
when the negative rail is failing (not negative enough), PFO
goes HIGH (the opposite of when positive voltages are
monitored). To trigger a reset, these outputs need to be
inverted: adding the resistors and transistor as shown
achieves this. The RESET output will then have the same
sense as for positive voltages: good = HIGH, bad = LOW. It
should be noted that this circuit’s accuracy depends on the
V
CC
line, the PFI threshold tolerance, and the resistors.
V
CC
PFI
MR
PFO
V
CC
R
1
R
2
ASM70x
RESET
GND
To
μP
Figure 5: Monitoring a negative voltage
2N3904
R
3
R
4
V
CC
- 1.25
R
1
=
1.25 - VTRIP
R
2
Negative Input Voltage
+
相關(guān)PDF資料 |
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| ASM805LEPA | UP Power Supply Supervisor With Battery Backup Switch |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| AS705-125A | 制造商:Sumida Corporation 功能描述:- Tape and Reel |
| AS705-125A-XH | 制造商:Sumida Corporation 功能描述:ANTENNA |
| AS71000FLF | 制造商:TT Electronics / IRC 功能描述:AS71000FLF |
| AS71000HLF | 制造商:TT Electronics / IRC 功能描述:AS71000HLF |
| AS71000JLF | 制造商:TT Electronics / IRC 功能描述:AS71000JLF |
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