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STM1404CTNIQ6F bảng dữ liệu(PDF) 5 Page - STMicroelectronics

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STM1404
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. These inputs can
be connected externally to several types of actua-
tor 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.
TP1 and TP3 are set Normally to High (NH). They
are connected externally through a closed switch
or a high-impedance resistor to VOUT (in the case
of STM1404A or STM1404A) or VTPU (in the case
of STM1404B/C), A tamper condition will be de-
tected when the input pin is pulled low. If not used,
tie the pin to VOUT or VTPU.
TP2 and TP4 are set Normally to Low (NL). They
are connected externally through a high-imped-
ance resistor or a closed switch to VSS. A tamper
condition will be detected when the input pin is
pulled high. If not used, tie the pin to VSS.
Supply Voltage
The internally switched supply voltage, VINT (ei-
ther VCC input or VBAT input) is continuously mon-
itored. If VINT should exceed the over voltage trip
point, VHV (set at 4.2V, typical), or should go below
the under voltage trip point, VLV (set at 2.0v, typi-
cal). 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 sen-
sor to monitor the temperature. If a preset (cus-
tomer-selectable,
factory-programmed)
over-
temperature trip point (TH) or under-temperature
trip point (TL) is exceeded, the SAL is asserted
low.
When no tamper condition exists, SAL is normally
High.
When a tamper is detected, the SAL is activated
(driven low), independent of the part type. VOUT
can be driven to one of three states, depending on
which variant of STM1404 is being used (see De-
vice Options, page 1):
ON;
High-Z; or
Ground (VSS).
Note: The STM1404 must be initially powered
above VRST to enable the tamper detection
alarms. For example, if the battery is on while VCC
= 0V, no alarm condition can be detected until VCC
rises above VRST (and trec expires). From this
point on, alarms can be detected either on battery
or VCC. This is done to avoid false alarms when
the device goes from no power to its operational
state.


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