In some parts of the world, disabling a system with large magnetic fields produced by strong magnets does occur. In systems where case tampering is important, Hall-effect linear devices can also determine the strength of external magnetic fields not present during normal operation. Hall-effect sensors have the advantage of being very low in power consumption for example, the DRV5032 has an average current draw of 0.54 ♚. Once the door moves away from the sensor, the magnetic flux is no longer present and the sensor can then determine whether the case has been opened. Hall-effect switches detect the type of tampering where a case is opened by mounting a magnet to the door of the device see the Magnetic Tamper Detection Using Low-Power Hall-Effect Sensors Reference Design shown in Figure 1. How to select the right sensor for tamper detection Let’s look at four different tamper detection sensor technologies. The potential that a user may tamper with a device to alter its functionality, such as an electricity meter.Any possibility that a device will be damaged once tampered with, such as products submerged in water or other harsh environments.A safety-critical need to shut off a portion of a product if opened, such as a smart lock or a high-voltage power supply.Tamper detection is appropriate when there is: Sensors from TI, for example, have been optimized to be small in device size and low in quiescent current draw.ĭo you need tamper detection in your design? It is possible to implement tamper detection in constrained applications when you need to minimize space and power consumption, such as in battery-powered or other applications where the standby power must stay below a certain level. In this technical article, I will compare several tamper detection methods in order to help you choose the right option for your next design. The good news is that many different kinds of sensors can assist in the effectiveness of tamper detection. Device tampering can have many negative impacts, including unexpected changes in functionality, a safety risk to humans, security breaches or ruined devices. In other cases, it could mean that a seal on a device has been breached, or that an external element is affecting measurement precision. In some cases, that could mean that the door of a product has been opened. HDC2080Many systems require a method to detect tampering. Other Parts Discussed in Post: LDC0851, HDC2080, OPT3002
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