AS3955 datasheet(46/102 Pages) AMSCO

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[v1-04] 2016-Feb-03

AS3955 − Detailed Description

Interrupts:

• Rx start (I_rxs bit in Interrupt Register 1)

• Rx end, Tx end (resp. I_rxe and I_txe bits in Interrupt

• CRC, parity and framing interrupt (resp. I_crc_err, I_par_

err and I_frm_err bits in Interrupt Register 1)

• Buffer error (I_bf_err in Interrupt Register 1)

• SPI / I²C buffer access error (I_acc_err in

Interrupt Register 1)

Commands:

• Transmit ACK

• Transmit NACK 0-5

• Transmit Buffer

• Go To Sense

• Go To Sleep

• Go To Sense / Sleep

Extended Mode

Extended mode enables communication between the NFC

device and MCU by employing standard NFC Tag 2 Type READ

and WRITE commands. The purpose of this communication

mode is to provide a simple data transfer mechanism between

a NFC device and a MCU while guaranteeing correct timing and

synchronization. This is achieved by implementing a robust

handshake mechanism.

This mode uses a part of the memory address space that is out

of range of the internal physical memory. The communication

between a NFC device and a MCU can be performed by using

WRITE/READ commands on address FCh – FFh, independently

of the EEPROM configuration size. Data with CRC or any other

error will not be forwarded to the MCU. In case of successful

reception of data, AS3955 will automatically reply with ACK.

Error handling in Extended mode is defined in Error Handling.

Data received from RF side are kept available until the MCU

reads the data. The implemented asynchronous transmission

protocol arbitrates on overlapping memory accesses

(producer-consumer principle) and complies with timing

constraints of both RF and SPI / I²C protocols regardless of the

MCU performance.

Extended mode can be configured by setting Configuration

Byte IC_CFG2 in EEPROM or the corresponding register ( IC

Configuration Register 2).

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