NCD1015ZP Datasheet NCD1015ZP | P4-P6

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2. Functional Overview and Description

2.1 Overview

The reader and the pre-programmed NCD1015ZP

transponder comprise the two elements of a

half-duplex wireless communications system

operating in a sequential mode with time-separated

power and data transmission cycles. Power transfer to

the transponder (tag) is accomplished by

electromagnetic coupling of the transponder and

reader antennae.

2.2 Power Transfer

As shown below in Figure 1, an activation field

sourced by the reader supplies power to the

transponder at the beginning of a read request. The

reader generates an electromagnetic field for 50 ms

using an activation frequency of 134.2 kHz to energize

the resonant circuit of the transponder. During this

Powering Phase, circuitry within the transponder

rectifies the induced voltage to charge an internal

storage capacitor. Energy held by the storage

capacitor provides the means by which the

transponder transmits it’s stored data. The reader

terminates the activation field to indicate it is ready to

receive data from the transponder.

Figure 1: Activation and Read Phases: Voltage at

the Reader’s Exciter and Transponder Coils

2.3 Communication Interface - Tag to Reader

Frequency Shift Keying (FSK) modulation is employed

by the NCD1015ZP to transmit the stored data

immediately after detecting the end of the reader’s

activation field. As can be seen in Figure 1, the tag’s

transmit (Response phase) directly follows the

Powering phase.

Transfer of the stored digital information is

accomplished by using two discrete frequencies, one

for a logic “1” (High) and another for a logic “0” (Low).

The nominal frequencies used for data transmission

are:

• f

= 124.2kHz is for logic high data encoding

• f

= 134.2kHz is for logic low data encoding

2.3.1 Data Bit Structure

Data bits are transmitted as 16 cycles of their

respective frequency. Because a logic high (1) data bit

uses a lower frequency than that for a logic low (0), the

duration of a 1 bit is longer than a 0 bit. The duration

for logic 1 and logic 0 bits is given below.

• t

= 16/f

= 16/124.2kHz = 128.8us

• t

= 16/f

= 16/134.2kHz = 119.2us

Figure 2 illustrates the FSK encoding principle used to

transmit the stored data.

Figure 2: FSK Transmission Used During the

Read Phase

2.3.2 Transponder Data Rate and Data Coding

The data coding is based on the NRZ method thus

achieving an average data rate of ~8kbit/s based on

an equal distribution of '0' and '1' data bits.

2.3.3 Completion of Transmission

Following the output of the last bit, the transponder

deactivates.

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2.4 Transmission Protocol

2.4.1 Transponder - Response Data Format

An RFID answer by the NCD1015ZP contains a

Header, the identification DATA, a CRC value, and a

Trailer.

Framed as shown below in Figure 3 the transmitted

signal has a fixed length of 128 bits. The Header

consists of a16-bit Pre-Bits leader followed by an 8-bit

Start byte. Following the CRC error checking value is

the Trailer consisting of an 8-bit Stop byte followed by

the 16-bit Post.

Depending on the value of the sixteenth Data bit,

logical data address [48], the Stop byte value

changes. When the identification data stored in the

NCD1050ZP complies with ISO 11784, data bit 16 as

defined in ISO 11784 will be 0 and the Stop byte value

will be 0x7E. For identification data not compliant with

ISO 11784 the Stop byte value will be determined by

the value stored in the sixteenth bit of the data.

The Data, CRC, Stop and Post data will be transmitted

starting with the LSB and ending with the MSB.

Figure 3: Tag Response Frame Format

All signals are coded [MSB:LSB].

• Pre-Bits [15:0] . . . = 0x0000

• Start Byte [7:0] . . = 0x7E

• Data [63:0] . . . . . = Data

• CRC [15:0] . . . . . = Data CRC

• Stop Byte [7:0] . . = 0x7E - Data bit 16 = 0

‡

• Stop Byte [7:0] . . = 0x1E - Data bit 16 = 1

‡

• Post Bits [15:0] . . = 0x0000

‡

Data bit position as defined in ISO 11784

2.4.2 CRC - CCITT Error Checking

The CRC generator circuitry creates a 16 bit CRC to

ensure the integrity of the data packets received by the

transponder. The reader and transponder use the

CRC-CCITT (Consultative Committee for International

Telegraph and Telephone) algorithm for error

detection.

The 16-bit cyclic redundancy code is calculated using

the following polynomial:

P(X) = x

+ x

The implemented version of the CRC check has the

following characteristics:

• Reverse CRC-CCITT 16 as described in

ISO/IEC 13239 and used in ISO/IEC

11784/11785.

• The CRC 16-bit shift register is initialized to all

zeros (0x0000).

• The incoming data bits are XOR-ed with the

MSB of the CRC register and is shifted into the

• After all data bits have been processed, the

CRC register contains the CRC-16 code.

• Reversibility - The original data, together with

associated CRC, when fed back into the same

CRC generator will regenerate the initial value

(all zero's).

Figure 4: Schematic Diagram of the 16-Bit CRC-CCITT Generator

Pre-Bits Start Data CRC Stop Post

1 16 17 24 25 88 89 (LSB) 104 105 112 113 128

P (X) = X0X1X2X3X4 X5X6X7X8X9X10X11 X12X13X14X15

MSB

Data in

LSB

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3. Mechanical Data

3.1 Dimensions and Material

3.2 Water Resistance

Water IP67. No frequency shift after 1 hour at 20ºC under 1 meter of water.

3.3 Mechanical Shock

Drop test (qualified by similarity)10 times at 30cm (both orientations)

3.4 Thermal Stress

Temperature cycling: 500 times 70°C  -25°C  70°C.

Transition time: 30 minutes

Dwell time at 70°C: 60 minutes)

Dwell time at -25°C: 60 minutes).

Parameter Min Typ Max Unit

Length 51.8 52.3 52.8 mm

Diameter 16.5 17 17.5 mm

Case Material PA66GF and epoxy

Specifications: DS-NCD1015ZP-R02

12/18/2015

For additional information please visit www.ixysic.com

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changes to specifications and product descriptions at any time without notice. Neither circuit patent licenses nor indemnity are expressed or implied. Except as set forth in IXYS Integrated

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products including, but not limited to, the implied warranty of merchantability, fitness for a particular purpose, or infringement of any intellectual property right.

The products described in this document are not designed, intended, authorized or warranted for use as components in systems intended for surgical implant into the body, or in other

applications intended to support or sustain life, or where malfunction of IXYS Integrated Circuits Division’s product may result in direct physical harm, injury, or death to a person or severe

property or environmental damage. IXYS Integrated Circuits Division reserves the right to discontinue or make changes to its products at any time without notice.

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RFID Transponders 50mm HDX Read Only RFID Transponder

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