US 12,086,294 B2
Voltage attack detection circuit and chip
Jiang Yang, Guangdong (CN); and Jianfeng Xue, Guangdong (CN)
Assigned to SHENZHEN GOODIX TECHNOLOGY CO., LTD., Guangdong (CN)
Filed by SHENZHEN GOODIX TECHNOLOGY CO., LTD., Guangdong (CN)
Filed on Sep. 30, 2021, as Appl. No. 17/490,178.
Application 17/490,178 is a continuation of application No. PCT/CN2020/082828, filed on Apr. 1, 2020.
Prior Publication US 2022/0019701 A1, Jan. 20, 2022
Int. Cl. G06F 21/75 (2013.01); G06F 21/55 (2013.01); G06F 21/85 (2013.01); H03K 17/22 (2006.01); G01R 19/00 (2006.01)
CPC G06F 21/755 (2017.08) [G06F 21/554 (2013.01); G06F 21/85 (2013.01); H03K 17/22 (2013.01); G01R 19/0084 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A voltage attack detection circuit, comprising:
at least one voltage regulation circuit, wherein the at least one voltage regulation circuit is connected to an external supply respectively, the at least one voltage regulation circuit is configured to convert the external supply to at least one internal supply, and the at least one internal supply is configured to output at least one first voltage respectively;
a reference voltage generation circuit, wherein the reference voltage generation circuit is connected to the external supply and configured to generate a reference voltage according to the external supply;
a reference voltage detection circuit, wherein the reference voltage detection circuit is connected to the reference voltage generation circuit and configured to receive the reference voltage and output an indication signal, the indication signal is configured to indicate whether the reference voltage is abnormal;
at least one voltage sensor, wherein the at least one voltage sensor and the at least one voltage regulation circuit correspond one to one, each voltage sensor of the at least one voltage sensor is connected to a corresponding internal supply of the at least one internal supply respectively, to receive a corresponding first voltage of the at least one first voltage respectively, and each voltage sensor of the at least one voltage sensor is further connected to the reference voltage generation circuit and the reference voltage detection circuit, to receive the reference voltage and the indication signal;
each voltage sensor of the at least one voltage sensor is configured to output a first signal based on the reference voltage, the indication signal, and a received first voltage of the at least one first voltage;
if the indication signal indicates that the reference voltage is normal, the first signal is configured to indicate whether the received first voltage is within a preset voltage range based on the reference voltage and the indication signal, so as to generate voltage attack alarm;
if the indication signal indicates that the reference voltage is abnormal, the first signal is configured to indicate that the received first voltage is within the preset voltage range, so as to avoid false alarms.