Method for writing data in a memory of a contactless transponder, and corresponding contactless transponder device
AssigneeSTMicroelectronics (Rousset) SAS
InventorsFrancois Tailliet, Beatrice Brochier, Sylvain Fidelis
Life of this patent
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Abstract
A contactless transponder includes a non-volatile static random access memory including memory points. Each memory point is formed by a volatile memory cell and a non-volatile memory cell. A protocol processing circuit receives data and stores the received data in the volatile memory cells of the memory. A write processing circuit is configured, at the end of the reception and storage of the data, to record, in a single write cycle, the data from the volatile memory cells to the non-volatile memory cells of the respective memory points.
Claims8
A method for writing data in a memory of a contactless transponder operating in a passive mode, the memory being a non-volatile static random access memory including memory points, wherein each memory point comprises a volatile memory cell and a non-volatile memory cell, the method comprising:
- generating power in said passive mode from electromagnetic energy received by said contactless transponder from a reader;
- a protocol phase comprising:
- receiving data;
- storing the received data in the volatile memory cells of the memory;
- and
- storing the electromagnetic energy in a capacitive circuit;
- and
- at the end of the protocol phase, a write phase comprising:
- performing a single write cycle to record the data from the volatile memory cells to the non-volatile memory cells of the respective memory points;
- and
- in response to said contactless transponder being deprived of said electromagnetic energy from the reader, supplying power from the capacitive circuit to the memory that is sufficient to supply power for autonomously performing said single write cycle during the write phase.
A contactless transponder device operating in a passive mode to generate power from electromagnetic energy received by said contactless transponder from a reader, comprising:
- a non-volatile static random access memory including memory points, wherein each memory point comprises a volatile memory cell and a non-volatile memory cell;
- a protocol processing circuit coupled to the non-volatile static random access memory and configured to receive data and to store the received data in the volatile memory cells;
- a capacitive circuit configured to store said electromagnetic energy during the reception and storage of the data by the protocol processing circuit;
- and
- a write processing circuit coupled to the capacitive circuit and the non-volatile static random access memory and configured, at the end of reception and storage of the data, to record, in a single write cycle, the data from the volatile memory cells to the non-volatile memory cells of the respective memory points;
- wherein said write processing circuit responds to said contactless transponder being deprived of said electromagnetic energy from the reader by using power supplied from the capacitive circuit to the memory that is sufficient to autonomously perform said single write cycle during the write phase.
Dependencies are inferred from the claim text.