CLRC663 datasheet(53/177 Pages) NXP

53 / 177 page

NXP Semiconductors

CLRC663

High performance multi-protocol NFC frontend CLRC663 and CLRC663 plus

After the command LPCD the standby of the CLRC663 is activated, if selected. The wake-up Timer4

can activate the system after a given time. For the LPCD, it is recommended to set T4AutoWakeUp and

T4AutoRestart, to start the timer and then go to standby. If a card is detected, the communication can be

started. If T4AutoWakeUp is not set, the IC will not enter Standby mode in case no card is detected.

8.9.4 Reset and start-up time

A 10 μs constant high level at the PDOWN pin starts the internal reset procedure.

The following figure shows the internal voltage regulator:

001aan360

PVDD

PDown

VSS

GLITCH

FILTER

INTERNAL VOLTAGE

REGULATOR

VDD

VSS

1.8 V

AVDD

DVDD

Figure 33. Internal PDown to voltage regulator logic

When the CLRC663 has finished, the reset phase and the oscillator has entered a stable working condition the

IC is ready to be used.

8.10 Command set

8.10.1 General

The behavior is determined by a state machine capable to perform a certain set of commands. By writing a

command-code to the command register, the command is executed.

Arguments and/or data necessary to process a command, are exchanged via the FIFO buffer.

• Each command that needs a certain number of arguments will start processing only when it has received the

correct number of arguments via the FIFO buffer.

• The FIFO buffer is not cleared automatically at command start. It is recommended to write the command

arguments and/or the data bytes into the FIFO buffer and start the command afterwards.

• Each command may be stopped by the host by writing a new command code into the command register e.g.:

the Idle-Command.

8.10.2 Command set overview

Command

No.

Parameter (bytes)

Short description

Idle

00h

no action, cancels current command execution

LPCD

01h

low-power card detection

LoadKey

02h

(keybyte1),(keybyte2), (keybyte3),

(keybyte4), (keybyte5),(keybyte6);

reads a MIFARE Classic key (size of 6 bytes) from

FIFO buffer ant puts it into Key buffer

MFAuthent

03h

60h or 61h, (block address), (card

serial number byte0),(card serial

number byte1), (card serial number

byte2),(card serial number byte3);

performs the MIFARE Classic authentication

Table 46. Command set

CLRC663

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 5.3 — 3 January 2024

53 / 177

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