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Semiconductor integrated circuit and noncontact information system including it

  • US 20070188297A1
  • Filed: 04/12/2005
  • Published: 08/16/2007
  • Est. Priority Date: 04/15/2004
  • Status: Active Grant
First Claim
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1. A semiconductor integrated circuit, to which a power supply voltage is supplied via electromagnetic waves received by an antenna coil, and which exchanges data via the antenna coil, the semiconductor integrated circuit comprising:

  • a memory circuit storing data;

    a pair of terminals to which the antenna coil is connected;

    a modulating-transmitting circuit for transmitting data via the antenna coil by varying a load between the terminals according to data to be transmitted;

    a transmission control circuit for outputting data stored in the memory circuit to the modulating-transmitting circuit; and

    a reset signal generating circuit for outputting a reset signal for resetting the transmission control circuit to the transmission control circuit when the power supply voltage decreases below a predetermined threshold value, wherein;

    the transmission control circuit is configured to output a transmission status signal, which indicates that data is being transmitted; and

    the reset signal generating circuit is configured so that the threshold value is lower during a period in which the transmission status signal is being output than during a period in which the transmission status signal is not being output.

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