參數(shù)資料
型號(hào)： STM1404
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(yè)數(shù)： 12/36頁(yè)
文件大?。?/td> 362K
代理商： STM1404
Pin descriptions
STM1404
12/36
Pin descriptions
See
Figure 1: Logic diagram
and
Table 2: Signal names
for a brief overview of the signals
connected to this device.
SAL, Security alarm output (open drain)
This signal can be generated when ANY of the following conditions occur:
V
INT
> V
HV
, where V
HV
= upper voltage trip limit (4.2V typ); and where V
INT
= V
CC
or
V
BAT
;
V
INT
< V
LV
, where V
LV
= lower voltage trip limit (2.0V typ); and where V
INT
= V
CC
or
V
BAT
; or
When any of the physical tamper inputs, TP
1
to TP
4
, change from their normal states to
the opposite (i.e., intrusion of a physical enclosure).
T
A
> T
H
, where T
H
is an upper temperature trip limit specified by the customer (+80°C,
+85°C, and +95°C), factory-programmed (STM1404 only);
T
A
< T
L
, where T
L
is a lower temperature trip limit specified by the customer (–25°C or
–35°C), factory-programmed (STM1404 only);
●
●
●
●
●
●
Note:
1
2
The default state of the SAL output during initial power-up is undetermined.
The alarm function will operate either with V
CC
on or when the part is internally switched
from V
CC
to V
BAT
.
TP
1
, TP
3
Physical Tamper Detect Pin set normally to High (NH). They are connected externally
through a closed switch or a high-impedance resistor to V
OUT
(in the case of STM1404A) or
V
TPU
(in the case of STM1404B/C. A tamper condition will be detected when the input pin is
pulled low (see
Figure 5
and
Figure 6 on page 10
). If not used, tie the pin to V
OUT
(for
STM1404A) or V
TPU
(for STM1404B/C).
TP
2
, TP
4
Physical Tamper Detect Pin set normally to Low (NL). They are connected externally
through a high-impedance resistor or a closed switch to V
SS
. A tamper condition will be
detected when the input pin is pulled high (see
Figure 7
and
Figure 8 on page 11
). If not
used, tie the pin to V
SS
.
Vccsw, V
CC
switch output
This output is low when V
OUT
(see
Section : V
OUT
on page 14
) is internally switched to V
CC
;
in this mode it may be used to turn on an external p-channel MOSFET switch which can
source an external device directly from V
CC
for currents greater than 80mA (bypassing the
STM1404).
This pin goes high when V
OUT
is internally switched to V
BAT
and may be used as a
“BATTERY ON” indicator.
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