公开(公告)号：US20200064901A1

公开(公告)日：2020-02-27

申请号：US16609573

申请日：2018-04-24

Applicant: FINGERPRINT CARDS AB

Inventor： Peter ALMERS ,  David CARLING ,  Rolf SUNDBLAD ,  Nicholas WEINER ,  Benjamin WILLCOCKS

IPC: G06F1/3234 ,  G06F11/30 ,  G06F1/3206 ,  G06F1/26 ,  G06F1/10 ,  G06F21/60 ,  G06F21/62 ,  G06F21/32 ,  G06K19/07 ,  H04B5/00 ,  G06K9/00

Abstract: A method of controlling operation of a field-powered biometric device comprising biometric acquisition circuitry, processing circuitry controllable to transition between a first functional state having a first power consumption and a second functional state having a second power consumption lower than the first power consumption, and power management circuitry. The method comprises the steps of monitoring, by the power management circuitry, a property indicative of a supply voltage to the processing circuitry; controlling, when the monitored property indicates that the supply voltage has fallen to a first threshold voltage, the processing circuitry to transition from the first functional state to the second functional state; and controlling, when the monitored property indicates that the supply voltage has increased to a second threshold voltage higher than the first threshold voltage, the processing circuitry to transition from the second functional state to the first functional state.