stm1403ctoq6f STMicroelectronics, stm1403ctoq6f Datasheet - Page 12

• Manufacturer Part Number: stm1403ctoq6f
• Description: 3v Fips-140 Security Supervisor With Battery Switchover
• Manufacturer: STMicroelectronics

BLD, V
Active-low RST output (open drain)
MR, Manual reset input
PFO, Power-fail output (open drain)
PFI, Power-fail input
V
12/35
REF
, Reference voltage output (1.237, typ)
BAT
1.
2.
3.
This is an internally loaded test of the battery, activated only during a power-up sequence to
insure that the battery is good either prior to or after encapsulation of the module. There are
three customer options for V
●
●
●
This output pin will go active-low when it detects a voltage on the V
will be released when V
Goes low and stays low when V
customer), or when MR is logic low. It remains low for t
above V
A logic low on MR asserts the RST Output. The RST Output remains asserted as long as
MR is low and for t
(typical) pull-up resistor. It can be driven from a TTL or CMOS Logic line or shorted to
Ground with a switch. Leave it open if unused.
When PFI is less than V
(battery switchover threshold ~ 2.4V), PFO goes low, otherwise, PFO remains high. Leave
this pin open if unused.
When PFI is less than V
active-low. If this function is unused, connect this pin to V
This is valid only when V
V
on the STM1403A. On the STM1403B/C, this pin is V
If unused, this pin should float.
low voltage detect output (open drain)
REF
STM1403A (V
operate in normal mode;
STM1403B (V
High when this occurs; and
STM1403C (V
High when this occurs.
2.3V (2.5V – external diode drop of about 0.2V) for a 3V Lithium cell;
2.5V (2.7V – 0.2V) for a 3V Lithium cell; or
3.2V (3.4V – 0.2V) for a 3.68V Lithium “AA” battery.
is pulled to Ground with an internal 100kΩ resistor. This is an optional feature available
RST
and MR goes from low to high.
rec
OUT
OUT
OUT
after MR returns to high. This active low input has an internal 40kΩ
remains ON when SAL is active-low): Vccsw pin will continue to
is taken to High-Z when SAL is active-low): Vccsw pin will be set to
is driven to Ground when SAL is active-low): Vccsw pin will be set to
CC
PFI
PFI
CC
, or when V
drops below V
(Power-fail Input Threshold Voltage) or V
is between 2.4V and 3.6V. When V
DET
CC
:
drops below V
CC
RST
falls below V
.
RST
TPU
(Reset Threshold selected by the
rec
SW
(200ms, typical) AFTER V
SS
(internally switched V
(see PFO, above), PFO goes
.
CC
falls below 2.4V (V
BAT
CC
pin below V
falls below V
CC
DET
or V
CC
SW
SW
. BLD
rises
BAT
),
).