STM1403 STMicroelectronics, STM1403 Datasheet - Page 11

• Manufacturer Part Number: STM1403
• Description: 3 V FIPS-140 security supervisor with battery switchover
• Manufacturer: STMicroelectronics

STM1403
2
2.1
Note:
2.1.1
2.1.2
2.1.3
1
2
Pin descriptions
See
connected to this device.
SAL, security alarm output (open drain)
This signal can be generated when ANY of the following conditions occur:
●
●
●
The default state of the SAL output during initial power-up is undetermined.
The alarm function will operate either with V
from V
TP
Physical tamper detect pin set normally to high (NH). They are connected externally through
a closed switch or a high-impedance resistor to V
the case of STM1403B/C. A tamper condition will be detected when the input pin is pulled
low (see
STM1403B/C).
TP
Physical tamper detect pin set normally to low (NL). They are connected externally through
a high-impedance resistor or a closed switch to V
when the input pin is pulled high (see
Vccsw, V
This output is low when V
to V
can source an external device directly from V
the STM1403).
This pin goes high when V
ON” indicator.
If a security alarm (SAL) is issued on tamper, then the state of the Vccsw pin is as follows:
1
2
CC
Figure 1: Logic diagram
, TP
, TP
V
V
V
V
When any of the physical tamper inputs, TP
the opposite (i.e., intrusion of a physical enclosure).
INT
BAT
INT
BAT
CC
; in this mode it may be used to turn on an external p-channel MOSFET switch which
Figure 5
;
; or
3
4
> V
< V
to V
CC
HV
LV
BAT
, where V
switch output
, where V
.
and
Figure
LV
HV
OUT
OUT
= lower voltage trip limit (2.0 V typ); and where V
= upper voltage trip limit (4.2 V typ); and where V
and
6). If not used, tie the pin to V
(see
Doc ID 13232 Rev 6
is internally switched to V
Table 2: Signal names
Section 2.1.10: V
Figure 7
CC
CC
and
on or when the part is internally switched
1
for currents greater than 80 mA (bypassing
OUT
SS
to TP
Figure
. A tamper condition will be detected
OUT
(in the case of STM1403A) or V
4
, change from their normal states to
for a brief overview of the signals
BAT
on page
OUT
8). If not used, tie the pin to V
and may be used as a “BATT
(for STM1403A) or V
13) is internally switched
Pin descriptions
INT
INT
= V
= V
CC
TPU
TPU
CC
or
11/34
(for
or
SS
(in
.