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參數(shù)資料
| 型號(hào)： | ISL88708 |
| 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(mén)狗定時(shí)器，電源故障比較器，手動(dòng)復(fù)位和可調(diào)電源監(jiān)控復(fù)位， |
| 文件頁(yè)數(shù)： | 7/13頁(yè) |
| 文件大?。?/td> | 518K |
| 代理商： | ISL88708 |
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7
FN8092.0
October 18, 2005
Adjusting t
POR
On the ISL88707 and ISL88708, users can adjust the Power
On Reset timeout delay (t
POR
) to many times the nominal
t
POR
of 200ms. To do this, connect a capacitor between
C
POR
and ground (see Figure 3). For example, connecting a
50pF capacitor to CPOR will increase t
POR
from 200ms to
10s. The maximum recommended capacitance that should
be placed on the CPOR pin is 50pF. Care should be taken in
PCB layout and capacitor placement in order to reduce stray
capacitance as much as possible, which contributes to t
POR
error.
Manual Reset
The manual-reset input (MR) allows the user to trigger a
reset by using a push-button switch. The MR input is an
active low debounced input. By connecting a push-button
directly from MR to ground, the designer adds manual
system reset capability (see Figure 4). Reset is asserted if
the MR pin is pulled low to less than 100mV for the minimum
MR pulse width or longer while the push-button is closed.
After MR is released, the reset outputs remain asserted for
t
POR
(200ms) and then released.
FIGURE 6. POWER-SUPPLY MONITORING TIMING DIAGRAM (WDI TRISTATED)
V
DD
MR
RST
t
POR
V
TH1
1V
t
POR
t
POR
>t
MR
t
RPD
RST
ISL88707
ISL88708
C
POR
FIGURE 7. ADJUSTING t
POR
WITH A CAPACITOR
C
POR
(pF)
OPEN
1
3
5
7
9
11
13
15
7
12
16
27
35
48
100
NORMALIZED t
POR
vs C
POR
(pF)
OPEN = 200ms
MR
PB
R
FIGURE 8. CONNECTING A MANUAL RESET PUSH-BUTTON
ISL88705, ISL88706, ISL88707, ISL88708, ISL88716, ISL88813
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