STM1403ARM-Q6F STMICROELECTRONICS [STMicroelectronics], STM1403ARM-Q6F Datasheet - Page 5

• Manufacturer Part Number: STM1403ARM-Q6F
• Description: 3V FIPS-140 Security Supervisor with Battery Switchover
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

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.
TP
are connected externally through a closed switch
or a high-impedance resistor to V
of STM1403A) or V
C), A tamper condition will be detected when the
input pin is pulled low. If not used, tie the pin to
V
TP
are connected externally through a high-imped-
ance resistor or a closed switch to V
condition will be detected when the input pin is
pulled high. If not used, tie the pin to V
OUT
1
2
and TP
and TP
or V
TPU
3
4
are set Normally to High (NH). They
.
are set Normally to Low (NL). They
TPU
(in the case of STM1403B/
OUT
SS
(in the case
SS
. A tamper
.
Supply Voltage
The internally switched supply voltage, V
ther V
itored. If V
point, V
the under voltage trip point, V
cal). SAL will be driven active-low. Once the
tamper condition no longer exists, the SAL pin will
return to its normal High state.
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. V
can be driven to one of three states, depending on
which variant of STM1403 is being used (see
vice Options, page
Note: The STM1403 must be initially powered
above V
alarms. For example, if the battery is on while V
= 0V, no alarm condition can be detected until V
rises above V
point on, alarms can be detected either on battery
or V
the device goes from no power to its operational
state.
ON;
High-Z; or
Ground (V
CC
CC
. This is done to avoid false alarms when
HV
input or V
RST
INT
(set at 4.2V, typical), or should go below
should exceed the over voltage trip
SS
to enable the tamper detection
RST
).
BAT
1):
(and t
input) is continuously mon-
rec
LV
expires). From this
(set at 2.0v, typi-
STM1403
INT
OUT
De-
(ei-
5/9
CC
CC