Anti-tamper circuit with internal local oscillator
US9818004B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 2016 |
| Grant date | Nov 14, 2017 |
| Priority date | — |
| Expiry date | Aug 31, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/3058
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A payment reader includes an anti-tamper circuit for periodically providing control signals to tamper detection devices for detecting tamper attempts. The anti-tamper circuit includes a battery that drives a clock source. The clock source outputs a periodic signal to an enabling circuit and a pulse generator. The pulse generator provides enabling signal to an enabling circuit when it receives the periodic signal, and the enabling circuit provides an oscillator activation signal to a local oscillator when the enabling circuit receives the enabling signal and the periodic signal. The local oscillator provides an oscillating signal to the pulse generator, which utilizes the oscillating signal to exchange control signals with the tamper detection devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.