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參數(shù)資料
| 型號： | STM1403 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Security Supervisor with Battery Switchover(帶電池轉(zhuǎn)換功能的安全監(jiān)控器) |
| 中文描述： | 安全監(jiān)控與電池切換（帶電池轉(zhuǎn)換功能的安全監(jiān)控器） |
| 文件頁數(shù)： | 15/35頁 |
| 文件大?。?/td> | 356K |
| 代理商： | STM1403 |
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STM1403
Operation
15/35
Table 3.
I/O status in battery back-up
Power-fail input/output
The Power-fail Input (PFI) is compared to an internal reference voltage (independent from
the V
RST
comparator). If PFI is less than the power-fail threshold (V
PFI
), the Power-Fail
Output (PFO) will go low. This function is intended for use as an undervoltage detector to
signal a failing power supply. Typically PFI is connected through an external voltage divider
(see
Figure 4 on page 9
) to either the unregulated DC input (if it is available) or the
regulated output of the V
CC
regulator. The voltage divider can be set up such that the
voltage at PFI falls below V
PFI
several milliseconds before the regulated V
CC
input to the
STM1403 or the microprocessor drops below the minimum operating voltage.
During battery back-up, the power-fail comparator is turned off and PFO goes (or remains)
low (see
Figure 9 on page 16
). This occurs after V
CC
drops below V
SW
(~2.4V). When
power returns, the power-fail comparator is enabled and PFO follows PFI. If the comparator
is unused, PFI should be connected to V
SS
and PFO left unconnected. PFO may be
connected to MR so that a low voltage on PFI will generate a reset output.
Applications information
These Supervisor circuits are not short-circuit protected. Shorting V
OUT
to ground -
excluding power-up transients such as charging a decoupling capacitor - destroys the
device. Decouple both V
CC
and V
BAT
pins to ground by placing 0.1μF capacitors as close to
the device as possible.
Pin
Status
V
OUT
V
CC
PFI
Connected to V
BAT
through internal switch
Disconnected from V
OUT
Disabled
PFO
Logic low
MR
Disabled
RST
Logic low
V
BAT
Vccsw
Connected to V
OUT
Logic high
V
REF
BLD
Pulled to V
SS
below 2.4V (V
SW
)
Logic high
V
TPU
Connected to V
BAT
through an internal switch
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