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STM1404ASOJQ6F Datasheet(PDF) 5 Page - STMicroelectronics |
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STM1404ASOJQ6F Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 9 page 5/9 STM1404 TAMPER DETECTION Physical 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. TP1 and TP3 are set Normally to High (NH). They are connected externally through a closed switch or a high-impedance resistor to VOUT (in the case of STM1404A or STM1404A) or VTPU (in the case of STM1404B/C), A tamper condition will be de- tected when the input pin is pulled low. If not used, tie the pin to VOUT or VTPU. TP2 and TP4 are set Normally to Low (NL). They are connected externally through a high-imped- ance resistor or a closed switch to VSS. A tamper condition will be detected when the input pin is pulled high. If not used, tie the pin to VSS. Supply Voltage The internally switched supply voltage, VINT (ei- ther VCC input or VBAT input) is continuously mon- itored. If VINT should exceed the over voltage trip point, VHV (set at 4.2V, typical), or should go below the under voltage trip point, VLV (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. Temperature The STM1404 has a built-in, bandgap-based sen- sor to monitor the temperature. If a preset (cus- tomer-selectable, factory-programmed) over- temperature trip point (TH) or under-temperature trip point (TL) is exceeded, the SAL is asserted low. 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. VOUT can be driven to one of three states, depending on which variant of STM1404 is being used (see De- vice Options, page 1): ■ ON; ■ High-Z; or ■ Ground (VSS). Note: The STM1404 must be initially powered above VRST to enable the tamper detection alarms. For example, if the battery is on while VCC = 0V, no alarm condition can be detected until VCC rises above VRST (and trec expires). From this point on, alarms can be detected either on battery or VCC. This is done to avoid false alarms when the device goes from no power to its operational state. |
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