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參數(shù)資料
| 型號： | 795T |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 3V Supervisor with Battery Switchover |
| 中文描述： | 3V的監(jiān)控與電池切換 |
| 文件頁數(shù)： | 12/32頁 |
| 文件大?。?/td> | 304K |
| 代理商： | 795T |
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STM690/704/795/802/804/805/806
12/32
Using a SuperCap as a Backup Power
Source
SuperCaps are capacitors with extremely high
capacitance values (e.g., order of 0.47F) for their
size. Figure
15
shows how to use a SuperCap as
a back-up power source. The SuperCap may be
connected through a diode to the V
CC
supply.
Since V
BAT
can exceed V
CC
while V
CC
is above
the reset threshold, there are no special precau-
tions when using these supervisors with a Super-
Cap.
Figure 15. Using a SuperCap
Negative-Going V
CC
Transients
The STM690/704/795/802/804/805/806 Supervi-
sors are relatively immune to negative-going V
CC
transients (glitches).
Figure 33., page 21
was gen-
erated using a negative pulse applied to V
CC
,
starting at V
RST
+ 0.3V and ending below the reset
threshold by the magnitude indicated (comparator
overdrive). The graph indicates the maximum
pulse width a negative V
CC
transient can have
without causing a reset pulse. As the magnitude of
the transient increases (further below the thresh-
old), the maximum allowable pulse width decreas-
es. Any combination of duration and overdrive
which lies under the curve will NOT generate a re-
set signal. Typically, a V
CC
transient that goes
100mV below the reset threshold and lasts 40μs or
less will not cause a reset pulse. A 0.1μF bypass
capacitor mounted as close as possible to the V
CC
pin provides additional transient immunity.
AI08805
STMXXX
V
BAT
V
CC
V
OUT
5V
GND
RST
To external SRAM
To μP
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