Patent ID: 8522051
Filing Date: 2013-08-27
Classification: H01L,H05K,Y10T

Abstract:
1. A system comprising: a circuit board; an integrated circuit device mounted on the circuit board by means of an external contact, and comprising an anti-tamper device being connectable to the external contact to switch the integrated circuit device into a safe mode upon application of a predetermined electrical state at the external contact, wherein the anti-tamper device comprises a first resistor forming, along with a second resistor arranged external to the anti-temper circuit at the circuit board, which is connected to the first resistor via the external contact, a Wheatstone bridge; and a cover connected to the circuit board, the cover covering the external contact and the integrated circuit device, wherein the cover comprises a protective cap being affixed to the circuit board so that the integrated circuit device is enclosed by the protective cap and the circuit board and external access to the external contacts is prohibited by the protective cap, wherein the system further comprises a resin being cast onto the integrated circuit device and/or the external contacts such that external access to the external contacts is prohibited by the resin, wherein the integrated circuit and the resin are enclosed by the protective cap and the circuit board, wherein the resin touches an area of a surface of the circuit board surrounding the integrated circuit device, wherein the circuit board comprises at least one protrusion in the area of the surface of the circuit board surrounding the integrated circuit device: and wherein the cover comprises a metallic material forming a capacitance value that is stored in the integrated circuit device such that any deviance from the stored capacitance value signals a potential tamper.