Datasheet > STM1403ASM-Q6F

STM1403ASM-Q6F

更新时间： 2022-11-26 03:33:30

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		电池监控
页数	文件大小	规格书
9页	166K
描述
3V FIPS-140 Security Supervisor with Battery Switchover

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STM1403ASM-Q6F 数据手册

STM1403

TAMPER DETECTION

Physical

Supply Voltage

The internally switched supply voltage, V

There are four (4) high-impedance physical

tamper detect input pins, 2 normally set to High

(NH) and 2 normally set to Low (NL). Each input is

designed with a glitch immunity. These inputs can

be connected externally to several types of actua-

tor devices (e.g., switches, wire mesh). A tamper

on any one of the four inputs that causes its state

to change will trigger the security alarm (SAL) and

drive it to active-low. Once the tamper condition no

longer exists, the SAL will return to its normal High

state.

(ei-

INT

ther V input or V

input) is continuously mon-

BAT

itored. If V

should exceed the over voltage trip

INT

point, V (set at 4.2V, typical), or should go below

the under voltage trip point, V (set at 2.0v, typi-

cal). SAL will be driven active-low. Once the

tamper condition no longer exists, the SAL pin will

return to its normal High state.

When no tamper condition exists, SAL is normally

High.

When a tamper is detected, the SAL is activated

(driven low), independent of the part type. V

can be driven to one of three states, depending on

which variant of STM1403 is being used (see De-

vice Options, page 1):

TP and TP are set Normally to High (NH). They

OUT

are connected externally through a closed switch

or a high-impedance resistor to V (in the case

of STM1403A) or V

C), A tamper condition will be detected when the

input pin is pulled low. If not used, tie the pin to

OUT

(in the case of STM1403B/

TPU

■

ON;

High-Z; or

Ground (V ).

or V

OUT

TPU

TP and TP are set Normally to Low (NL). They

are connected externally through a high-imped-

Note: The STM1403 must be initially powered

above V to enable the tamper detection

ance resistor or a closed switch to V . A tamper

RST

condition will be detected when the input pin is

alarms. For example, if the battery is on while V

pulled high. If not used, tie the pin to V

= 0V, no alarm condition can be detected until V

rises above V

(and t

expires). From this

rec

RST

point on, alarms can be detected either on battery

or V . This is done to avoid false alarms when

the device goes from no power to its operational

state.

5/9

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