STM1403ARMQ6F STMICROELECTRONICS [STMicroelectronics], STM1403ARMQ6F Datasheet - Page 17

• Manufacturer Part Number: STM1403ARMQ6F
• Description: 3 V FIPS-140 security supervisor with battery switchover
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

STM1403
4
4.1
4.2
Note:
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
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
switch or a high-impedance resistor to V
of STM1403B/C), A tamper condition will be detected when the input pin is pulled low (see
Figure 5
TP
impedance resistor or a closed switch to V
input pin is pulled high (see
Supply voltage
The internally switched supply voltage, V
monitored. If V
should go below the under voltage trip point, V
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 (see
page
When a tamper is detected, the SAL is activated (driven low), independent of the part type.
V
used (see
●
●
●
The STM1403 must be initially powered above V
For example, if the battery is on while V
V
on battery or V
its operational state.
OUT
CC
1
2
and TP
and TP
rises above V
ON
High-Z or
Ground (V
11).
can be driven to one of three states, depending on which variant of STM1403 is being
and
Table 1: Device summary on page
3
4
are set normally to high (NH). They are connected externally through a closed
Figure
are set normally to low (NL). They are connected externally through a high-
INT
CC
SS
28). These inputs can be connected externally to several types of actuator
. This is done to avoid false alarms when the device goes from no power to
)
should exceed the over voltage trip point, V
RST
6). If not used, tie the pin to V
(and t
Figure 7
rec
expires). From this point on, alarms can be detected either
and
CC
OUT
INT
Figure
SS
= 0V, no alarm condition can be detected until
(in the case of STM1403A) or V
(either V
. A tamper condition will be detected when the
1):
LV
RST
8). If not used, tie the pin to V
(set at 2.0 V, typical). SAL will be driven
OUT
to enable the tamper detection alarms.
CC
or V
input or V
TPU
Section 2: Pin descriptions on
HV
.
(set at 4.2V, typical), or
BAT
input) is continuously
Tamper detection
TPU
SS
(in the case
.
17/35