Circuit device, electronic apparatus, and IC card

摘要

A circuit device includes: a first storage control unit which receives power from a power receiving unit which receives power by electromagnetic induction, to perform control of storing charge in a first charge storage unit; a second storage control unit which performs control of storing charge in a second charge storage unit; and a power source supply unit which supplies power source to a system device based on charges stored in the first charge storage unit and the second charge storage unit. The second charge storage unit is a charge storage unit whose charge storage capacitance is smaller than that of the first charge storage unit. The power source supply unit supplies, at the time of system start-up after the start of power reception, power source based on the stored charge of the second charge storage unit to the system device.

主权项

1. An electronic apparatus comprising:
a system device that performs a display control process of a display unit which displays an image; and a circuit device including:
a first storage control unit which receives power from a power receiving unit which receives power by electromagnetic induction, to perform control of storing charge in a first charge storage unit;a second storage control unit which receives power from the power receiving unit to perform control of storing charge in a second charge storage unit; anda power source supply unit which supplies power source to the system device based on charges stored in the first charge storage unit and the second charge storage unit, wherein
the second charge storage unit is a system-start-up charge storage unit whose charge storage capacitance is smaller than that of the first charge storage unit,during a power reception period, the first storage control unit performs control of storing an amount of charge sufficient to perform at least one display rewriting process of the display unit,the power source supply unit supplies, at the time of system start-up after the start of power reception by the power receiving unit, power source based on the stored charge of the second charge storage unit to the system device,during a display rewriting period following the power reception period, at the time of the system start-up, the system device is supplied with the power source based on the amount of charge stored in the first charge storage unit during the power reception period to perform a display rewriting process of the display unit, andwhen the length of the power reception period is defined as T1 and the length of the display rewriting period is defined as T2, the relationship of T2>T1 is satisfied.