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| 型號： | ASM813LESA-T |
| 廠商： | ALLIANCE SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 40=20X2 .004" SMD FEMALE HEADER |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大小： | 198K |
| 代理商： | ASM813LESA-T |
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
+
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