stm1404c STMicroelectronics, stm1404c Datasheet - Page 12

• Manufacturer Part Number: stm1404c
• Description: Security Supervisor With Battery Switchover
• Manufacturer: STMicroelectronics

Pin descriptions
SAL, Security alarm output (open drain)
Note:
TP
TP
Vccsw, V
12/36
1
2
, TP
, TP
1
2
3
4
CC
See
connected to this device.
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
Physical Tamper Detect Pin set normally to High (NH). They are connected externally
through a closed switch or a high-impedance resistor to V
V
pulled low (see
STM1404A) or V
Physical Tamper Detect Pin set normally to Low (NL). They are connected externally
through a high-impedance resistor or a closed switch to V
detected when the input pin is pulled high (see
used, tie the pin to V
This output is low when V
in this mode it may be used to turn on an external p-channel MOSFET switch which can
source an external device directly from V
STM1404).
This pin goes high when V
“BATTERY ON” indicator.
TPU
switch output
Figure 1: Logic diagram
V
V
V
V
When any of the physical tamper inputs, TP
the opposite (i.e., intrusion of a physical enclosure).
T
+85°C, and +95°C), factory-programmed (STM1404 only);
T
–35°C), factory-programmed (STM1404 only);
(in the case of STM1404B/C. A tamper condition will be detected when the input pin is
A
A
INT
BAT
INT
BAT
CC
> T
< T
;
; or
> V
< V
to V
H
L
, where T
, where T
HV
LV
BAT
, where V
, where V
Figure 5
.
TPU
SS
(for STM1404B/C).
L
H
.
is a lower temperature trip limit specified by the customer (–25°C or
is an upper temperature trip limit specified by the customer (+80°C,
LV
and
HV
OUT
OUT
= lower voltage trip limit (2.0V typ); and where V
= upper voltage trip limit (4.2V typ); and where V
and
Figure 6 on page
(see
is internally switched to V
Table 2: Signal names
Section : V
CC
CC
for currents greater than 80mA (bypassing the
OUT
10). If not used, tie the pin to V
on or when the part is internally switched
Figure 7
1
to TP
on page
4
, change from their normal states to
and
for a brief overview of the signals
BAT
OUT
SS
14) is internally switched to V
. A tamper condition will be
and may be used as a
Figure 8 on page
(in the case of STM1404A) or
INT
INT
OUT
11). If not
= V
= V
(for
CC
CC
or
or
CC
;