參數(shù)資料
型號(hào)： STM1404
廠(chǎng)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(yè)數(shù)： 16/36頁(yè)
文件大?。?/td> 362K
代理商： STM1404
Operation
STM1404
16/36
Table 3.
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
STM1404 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 17
). 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.
I/O status in battery back-up
Pin
Status
V
OUT
Connected to V
BAT
through internal switch
V
CC
Disconnected from V
OUT
PFI
Disabled
PFO
Logic low
MR
Disabled
RST
Logic low
V
BAT
Connected to V
OUT
Vccsw
Logic high
V
REF
Pulled to V
SS
below 2.4V (V
SW
)
BLD
Logic high
V
TPU
Connected to V
BAT
through an internal switch
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