參數資料
型號: ISL88707
廠商: Intersil Corporation
英文描述: UP Supervisor with Watchdog Timer,Power-Fail Comparator, Manual Reset and Adjustable Power-On Reset
中文描述: 與看門狗定時器,電源故障比較器,手動復位和可調電源監(jiān)控復位,
文件頁數: 10/13頁
文件大?。?/td> 518K
代理商: ISL88707
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
相關PDF資料
PDF描述
ISL88708 UP Supervisor with Watchdog Timer,Power-Fail Comparator, Manual Reset and Adjustable Power-On Reset
ISL88716 UP Supervisor with Watchdog Timer,Power-Fail Comparator, Manual Reset and Adjustable Power-On Reset
ISL88706IB826Z GT 14C 14#16 SKT RECP BOX
ISL88716IB826Z UP Supervisor with Watchdog Timer,Power-Fail Comparator, Manual Reset and Adjustable Power-On Reset
ISL88708IB826Z GT 16C 16#16 SKT RECP BOX RM
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