Information

NXP Semiconductors

AN11022

CLRC663 Quickstart Guide

3.6.3 Microcontroller interface type

The CLRC663 supports direct interfacing of various hosts as the SPI, I2C, I2CL and

serial

UART interface type. The CLRC663 resets its interface and checks the current host

interface type automatically having performed a Power-On or Hard Reset. The CLRC663

identifies the host interface by the means of the logic levels on the control pins after the

Reset Phase. This is done by a combination of fixed pin connections. The Table 1 on

page 5 shows the different configurations.

3.6.4 USB-RS232 adapter

The development boards make use of a serial RS232 interface which is connected to a

PC to execute scripts or other PC based software to control the functionality of the

contactless reader IC.

More and more it is found that modern PC’s are not equipped by default with the RS232

interface.

A standard interface available on most PCs is the USB interface. USB to serial

converters convert the signals of a USB interface to RS232 signals are available in the

market.

In practice we have found that not all USB /RS232 converters are working without

problems. The reason for this problem could be that the designers of this interface need

to find a compromise to fit most applications, so that it does not fit very well to the use

case of transferring contactless data.

To avoid this problem more information’s about RS232 to USB converter and the right

configuration can be found in AN11116 (“Using the RS232 serial evaluation boards on a

USB port”) on CLRC 663 web page.

Application note

COMPANY PUBLIC

Rev. 1.2 — 14 January 2015

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