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參數(shù)資料
| 型號： | ISL88708IP831Z |
| 廠商： | INTERSIL CORP |
| 元件分類： | 電源管理 |
| 英文描述： | UP Supervisor with Watchdog Timer,Power-Fail Comparator, Manual Reset and Adjustable Power-On Reset |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDIP8 |
| 封裝： | ROHS COMPLIANT, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 518K |
| 代理商： | ISL88708IP831Z |
10
FN8092.0
October 18, 2005
Bipolar Voltage Sensing
Any of the ISL88705 - ISL88813 devices can be used to
sense and report the presence of both a positive and
negative voltage via the PFI and PFO as shown in Figure 16.
The V
DD
monitors the positive voltage as normal and the
PFI monitors the presence of the negative supply. As the
differential voltage across the R1, R2 divider is increased the
resistor values must be chosen such that the PFI node is
<1.25V when the -V supply is satisfactory and the positive
supply is at its maximum specified value. This allows the
positive supply to fluctuate within its acceptable range
without signaling a reset. Driving the MR with the inverted
PFO signal as shown provides for reset generation when -V
is not satisfactorily present. Reset will remain asserted as
long as PFO is high.
FIGURE 14. 5V OV/UV MONITORING
FIGURE 15. ISL88075EVAL1
RESET
V
DD
5.5V OV
FIGURE 16. ±5V MONITORING
+5V
ISL8870X
-5V
100k
100k
2N3904
MR
RST
PFO
PFI
R1
R2
V+
V-
RESET
ISL88705, ISL88706, ISL88707, ISL88708, ISL88716, ISL88813
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| ISL88708IP844Z | UP Supervisor with Watchdog Timer,Power-Fail Comparator, Manual Reset and Adjustable Power-On Reset |
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