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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)： | 13/35頁 |
| 文件大?。?/td> | 356K |
| 代理商： | STM1403 |
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STM1403
Pin descriptions
13/35
V
OUT
This is the Supply Voltage Output. When V
CC
rises above V
SO
(Battery Backup Switchover
Voltage), V
OUT
is supplied from V
CC
. In this condition, V
OUT
may be connected externally to
V
CC
through a p-channel MOSFET switch. When V
CC
falls below the lower value of V
SW
(~2.4V), or V
BAT
, V
OUT
is supplied from V
BAT
. It is recommended that the V
OUT
pin be
connected externally to a capacitor that will retain a charge for a period of time, in case an
intruder forces V
CC
or V
BAT
to Ground. The rectifying diode connected from the positive
terminal of the battery to the V
BAT
pin of the STM1403 will prevent discharge of the
capacitor.
Three variations of parts will be offered with the following options:
1.
STM1403A: V
OUT
remains ON when SAL is active-low; Vccsw pin will continue to
operate in normal mode (see
Section : Vccsw, V
CC
switch output on page 11
);
2.
STM1403B: V
OUT
is taken to High-Z when SAL is active-low; Vccsw pin will be set to
High when this occurs; and
3.
STM1403C: V
OUT
is driven to Ground when SAL is active-low; Vccsw pin will be set to
High when this occurs.
V
TPU
For STM1403B and STM1403C, this pin provides pull-up voltage for the physical tamper
pins (TP1-4). This pin is not to be used as voltage supply source for any other purpose.
Note:
V
TPU
is the internally switched supply voltage from either the V
CC
pin or the V
BAT
pin.
V
CC
This is the Supply voltage (2.2V to 3.6V).
V
BAT
This is the secondary (backup battery) supply voltage. The pin is connected to the positive
terminal of the battery with a rectifying diode like the BAT54J from STMicroelectronics for
reverse charge protection. Voltage at this pin, after diode rectification, will be approximately
0.2V less than the battery voltage, and will depend on the type of battery used as well as the
I
BAT
being drawn. (A capacitor of at least 1.0μF connected between the V
BAT
pin and V
SS
is
required.) If no battery is used, connect the V
BAT
pin to the V
CC
pin.
V
SS
Ground, V
SS
, is the reference for the power supply. It must be connected to system ground.
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