AN3255 datasheet(10/24 Pages) STMICROELECTRONICS

10 / 24 page

Application description

AN3255

10/24

Doc ID 17784 Rev 1

Serial resistor allowing to fine

tune the quality factor of the

reader antenna

Capacitor

C1, C2

7 pF

crystal oscillator capacitors

22 nF

μF-

5pF (50V)

100 nF

C7, C7’

220 pF (50 V), 56 pF (50 V)

Capacitors allowing to fine tune

the RLC resonant frequency

C8, C8’

82 pF (50 V), 22 pF (50 V)

impedance adaptation of the

RLC resonant circuit.

Diode

D1 (N4148)

Optional

Ferrite

L3,L4,L5,L6, L7 multilayer SMD

ferrites

Removal of parasites for tag

data reception and I2C

Table 3.

List of PCB packaged components

Part name

Component name

Description

Package

CR14/CRX14

Short-range RFID

couplers

Contactless coupler

compliant with short-

range ISO14443 type-B

standard

SO16

13.56 MHz crystal

Crystal

Generates a 13.56 MHz

carrier frequency

XTALCMS

Table 4.

List of tag packaged components

Part name

Component name

Description

Package

SRI2K

13,56 MHZ short-range

contactless memory

chip

Short-range contactless

memory used to build a

tag

SBN18

Table 5.

List of other passive components

Component description

Value

Comment

Resistor

RP1, RP2 resistors

4,7 K

Pull-up for I2C open-drain

Table 2.

List of PCB passive components (continued)

Component description

Value

Comment

AN3255 Datasheet(PDF) 10 Page - STMicroelectronics

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