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參數(shù)資料
| 型號： | STM1403 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Security Supervisor with Battery Switchover(帶電池轉(zhuǎn)換功能的安全監(jiān)控器) |
| 中文描述： | 安全監(jiān)控與電池切換（帶電池轉(zhuǎn)換功能的安全監(jiān)控器） |
| 文件頁數(shù)： | 12/35頁 |
| 文件大小： | 356K |
| 代理商： | STM1403 |
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Pin descriptions
STM1403
12/35
1.
STM1403A (V
OUT
remains ON when SAL is active-low): Vccsw pin will continue to
operate in normal mode;
STM1403B (V
OUT
is taken to High-Z when SAL is active-low): Vccsw pin will be set to
High when this occurs; and
STM1403C (V
OUT
is driven to Ground when SAL is active-low): Vccsw pin will be set to
High when this occurs.
2.
3.
BLD, V
BAT
low voltage detect output (open drain)
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
DET
:
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.
●
●
●
This output pin will go active-low when it detects a voltage on the V
BAT
pin below V
DET
. BLD
will be released when V
CC
drops below V
RST
.
Active-low RST output (open drain)
Goes low and stays low when V
CC
drops below V
RST
(Reset Threshold selected by the
customer), or when MR is logic low. It remains low for t
rec
(200ms, typical) AFTER V
CC
rises
above V
RST
and MR goes from low to high.
MR, Manual reset input
A logic low on MR asserts the RST Output. The RST Output remains asserted as long as
MR is low and for t
rec
after MR returns to high. This active low input has an internal 40k
Ω
(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.
PFO, Power-fail output (open drain)
When PFI is less than V
PFI
(Power-fail Input Threshold Voltage) or V
CC
falls below V
SW
(battery switchover threshold ~ 2.4V), PFO goes low, otherwise, PFO remains high. Leave
this pin open if unused.
PFI, Power-fail input
When PFI is less than V
PFI
, or when V
CC
falls below V
SW
(see PFO, above), PFO goes
active-low. If this function is unused, connect this pin to V
SS
.
V
REF
, Reference voltage output (1.237, typ)
This is valid only when V
CC
is between 2.4V and 3.6V. When V
CC
falls below 2.4V (V
SW
),
V
REF
is pulled to Ground with an internal 100k
Ω
resistor. This is an optional feature available
on the STM1403A. On the STM1403B/C, this pin is V
TPU
(internally switched V
CC
or V
BAT
).
If unused, this pin should float.
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