Semiconductor integrated circuit and operation method of the same

Patent metadata

Field	Value
Publication number	US-9190867-B2
Application number	US-201314076258-A
Country	US
Kind code	B2
Filing date	Nov 10, 2013
Priority date	Nov 28, 2012
Publication date	Nov 17, 2015
Grant date	Nov 17, 2015

Abstract

The present invention is directed to solve a problem that, in the case where NFC and power supply operation of wireless power supply or the like repeat in a time division manner, the count value of a charge timer is reset to an initial value and a charge timer erroneously operates during an NFC period. A charge output terminal charges a battery using DC output voltage. A voltage detecting circuit detects reach of battery voltage to a predetermined level, generates a control signal, and generates a level determination signal discriminating an NFC period and a wireless power supply period by detection of the level of a DC input, voltage of an input terminal. During execution of operation of counting charge time of the battery by the charge timer, the voltage detecting circuit controls the charge timer by the control signal in the NFC period, and the charge timer holds the count value of the counting operation.

First claim

What is claimed is:

1. A semiconductor integrated circuit comprising:
an input terminal;
a DC-DC converter;
a charge output terminal;
a voltage detecting circuit; and
a charge timer,
wherein a DC input voltage generated by rectifying and smoothing reception signals repetitively supplied as an RF signal by NFC and an RF signal by wireless power supply can be supplied to the input terminal,
wherein the DC-DC converter can generate a DC output voltage having a desired vol…

Assignees

• Renesas Electronics Corp

Inventors

• Shimizu Kazuya

Classifications

• H02J7/42

  Electricity · mapped topic

• H02J7/92

  Electricity · mapped topic

• H02J50/10 Primary

  Electricity · mapped topic

• H04B5/266

  Electricity · mapped topic

• H04B5/24 Primary

  Electricity · mapped topic