| 摘要 |
<p>A contacless smart card comprises a microcontroller (22) and an interface for supplying power to the microcontroller (22). A shunt regulator (24) in the interface uses a comparator (32) to compare a voltage supply to the microcontroller (22) with a reference supply. The regulator issues a control signal when it detects that the microcontroller (22) is drawing too much current from the interface.</p> |
