ST25R3920B datasheet(18/158 Pages) STMICROELECTRONICS

tên linh kiện	ST25R3920B

Giải thích chi tiết về linh kiện	Automotive NFC reader for CCC digital key and car center console

PDF	158 Pages

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nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

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Description

ST25R3920B

18/158

DS13890 Rev 4

In Transparent mode the framing and FIFO are bypassed. The digitized subcarrier signal

directly drives the MISO pin.

2.2.13

FIFO

The ST25R3920B contain a 512-byte FIFO. Depending on the direction of the data transfer,

it contains either data which has been received or data which is to be transmitted.

In reader mode the ST25R3920B can transmit frames of up to 8191 bytes length and

receive frames of arbitrary length.

2.2.14

Control logic

The control logic contains I/O registers that define the operation of device.

2.2.15

Host interface

A 4-wire serial peripheral interface (SPI) and a 2-wire I2C interface are available to

communicate with an external microcontroller. The pins for the SPI and the I2C interface are

shared, and pin I2C_EN is used to select the active interface.

2.2.16

Passive target memory

The device contains a 48-byte RAM to store configuration data for the passive target and

card emulation mode.

2.2.17

P2RAM

The P2RAM stores information on wafer number, die position, device subversion, and I2C

address. The P2RAM is programmed during production.

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