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)： 18/36頁(yè)
文件大?。?/td> 362K
代理商： STM1404
Tamper detection
STM1404
18/36
Tamper detection
Physical
There are four (4) high-impedance physical tamper detect input pins, 2 normally set to High
(NH) and 2 normally set to Low (NL). Each input is designed with a glitch immunity (see
Table 7 on page 30
). These inputs can be connected externally to several types of actuator
devices (e.g., switches, wire mesh). A tamper on any one of the four inputs that causes its
state to change will trigger the security alarm (SAL) and drive it to active-low. Once the
tamper condition no longer exists, the SAL will return to its normal High state.
TP
1
and TP
3
are 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 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
or
V
TPU
.
TP
2
and TP
4
are 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
.
Supply voltage
The internally switched supply voltage, V
INT
(either V
CC
input or V
BAT
input) is continuously
monitored. If V
INT
should exceed the over voltage trip point, V
HV
(set at 4.2V, typical), or
should go below the under voltage trip point, V
LV
(set at 2.0v, typical). SAL will be driven
active-low. Once the tamper condition no longer exists, the SAL pin will return to its normal
High state.
Temperature
The STM1404 has a built-in, bandgap-based sensor to monitor the temperature. If a preset
(customer-selectable, factory-programmed) over-temperature trip point (T
H
) or under-
temperature trip point (T
L
) is exceeded, the SAL is asserted low.
When no tamper condition exists, SAL is normally High (see
Section : Pin descriptions on
page 12
).
When a tamper is detected, the SAL is activated (driven low), independent of the part type.
V
OUT
can be driven to one of three states, depending on which variant of STM1404 is being
used (see
Table 1 on page 1
):
ON;
High-Z; or
Ground (V
SS
).
The STM1404 must be initially powered above V
RST
to enable the tamper detection alarms.
For example, if the battery is on while V
CC
= 0V, no alarm condition can be detected until
V
CC
rises above V
RST
(and t
rec
expires). From this point on, alarms can be detected either
on battery or V
CC
. This is done to avoid false alarms when the device goes from no power to
its operational state.
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Note:
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