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NCD1015-LGA

P1-P3P4-P6P7-P9P10-P12P13-P13
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R00A PRELIMINARY 7
Figure 6: Reader to Tag - Encoding of End of Frame
4.4 Write Phase and the Programming of Data
A new identification number can be programmed into the OTP transponder in the following manner: After the charge
phase, the transponder enters the write mode provided that the reader starts to modulate the field by switching the
transmitter on and off. Writing means that the transponder shifts the received bits into an internal shift register. After
the write phase the reader's transmitter is switched on for the EEPROM programming time in order to energize the
process of programming the shift register's data into the EEPROM. Each 33 data bits of a block, including the lock bit,
are programmed simultaneously into the EEPROM.
Figure 7: Charge, Write, and Program - Voltage at the Reader and Transponder Antenna Coil
As illustrated in Figure 7 the EEPROM programming sequence consists of:
• Charge phase . . . . . . . . . . . . . . . .Continuous reader (RF Module) transmitter output signal
• Write phase . . . . . . . . . . . . . . . . . .Pulse interval encoding of the reader's transmitter output signal
• Programming phase. . . . . . . . . . .Continuous RF transmitter output
• Read phase . . . . . . . . . . . . . . . . . .FSK modulation of the transponder's resonant circuit oscillation
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8 PRELIMINARY R00A
5. Transmission Protocol
The transmission protocol defines the mechanism to exchange requests and data between the reader and the
transponder. The reader always starts the transmission, and the transponder does not start transmitting its response
until the reader's RF field is turned off.
The different data exchanges that can happen between reader and transponder are summarized in the lines below:
The requests that can be performed by the transponder built using the NCD1015-IC are as follows:
Charge-Only Read
The content of page 1 is read without any specific page address by just charging (powering-up) the transponder for up
to 50 ms.(ISO 11785 compatibility mode).
Write Block
Following the command and the block address, the lock bit(s) and the 32 data bits to be programmed with the
associated 16 CRC bits are sent to the transponder. The 32 data bits together with the associated lock bit are written
into the specified block simultaneously. Transponder response starts after the RF field is turned off.
Note: Each data block can be locked by setting the associated lock bit in order to create a read-only access and to
disable further re-programming of this block.
Note: After writing block 1 and block 2, it is recommended to send a Charge Only Read command to verify successful
writing.
5.1 Data Format Definitions
5.1.1 Reader Command - Request Format
A Charge-Read Only request is generated by just charging the transponder: The demodulator must start working
once the reader stops generating the electromagnetic field. It counts the number of cycles while the electromagnetic
field is low, if that number t
1
is larger than 40· t
C
, the tag will respond to a Charge-Read Only request.
If the t
1
duration is not larger than 40· t
C
, the system has to wait for a Reader Request Frame (RRF).
The Reader Request Frame Format as sent by the reader is shown in Figure 8.
Figure 8: Reader Request Frame Format
• Charge phase . . . . . . . . . . . . . . . .Continuous reader (RF Module) transmitter output signal
• Write phase . . . . . . . . . . . . . . . . . .Pulse interval encoding of the reader's transmitter output signal
• Programming phase. . . . . . . . . . .Continuous RF transmitter output
• Read phase . . . . . . . . . . . . . . . . . .FSK modulation of the transponder's resonant circuit oscillation
The length of the frame varies with the different commands.
SOF COM ADR DATA CRC EOF
-03478-LSB3940-LSB55-
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R00A PRELIMINARY 9
The NCD1015-IC first evaluates the command byte which consists of an address field in the MSN (Most Significant
Nibble) and a 4-bit command code of the incoming RRF. All other bit combinations may be considered as illegal. The
RRF Normal Mode command details are listed in the following table.
5.1.2 Transponder - Response Data Format
Any RFID answer is framed as shown in Figure 9, and it has a fixed length of 112 bits. Depending on the type of
answer, the STOP and POST bits change.
Figure 9: Tag Response Frame Format
All signals are coded [MSB:LSB].
• START - Start Byte [7:0] . . . . . . . . . . . = 7Ehex
• DATA - Data [63:0]. . . . . . . . . . . . . . . . = Data
• CRC - DCRC [15:0]. . . . . . . . . . . . . . . = Data CRC
• STOP - Stop Byte [7:0] . . . . . . . . . . . . = ADDRESS + STATUS - in all other cases, page status information
• POST - Post Bits [15:0] . . . . . . . . . . . . = 0000hex
STOP Byte content answering a CRO
The content of page 1 is sent during the response (ISO 11785 compatibility mode). The Stop Byte information will be
coded following the table shown below.
ADDRESS COMMAND DESCRIPTION
MSB LSB Write
0000 0010 Write Block 0 - Management Register
0001 0010 Write Block 1 - Identification Data / LSB
0010 0010 Write Block 2 - Identification Data / MSB
0111 0010 Write Block 7 - Configuration Register
Write & Lock
0000 1010 Write & Lock Block 0 - Management Register
0001 1010 Write & Lock Block 1 - Identification Data / LSB
0010 1010 Write & Lock Block 2 - Identification Data / MSB
0111 1010 Write & Lock Block 7 - Configuration Register
Start Data CRC Stop Post
1 8 9 (LSB) 72 73 (LSB) 88 89 96 97 112
ADDRESS STATUS DESCRIPTION
MSB LSB
0001 0010 Page Unlocked
0001 1110 Block 1 (LSB) Locked + Block 2 (MSB) Unlocked
0001 1010 Block 1 (LSB) Unlocked + Block 2 (MSB) Locked
0111 1110 Block 1 (LSB) Locked + Block 2 (MSB) Locked + BIT16 ISO11785=0
0001 1110 Block 1 (LSB) Locked + Block 2 (MSB) Locked + BIT16 ISO11785=1
P1-P3P4-P6P7-P9P10-P12P13-P13

NCD1015-LGA

Mfr. #:
Buy NCD1015-LGA
Manufacturer:
IXYS Integrated Circuits
Description:
RFID Transponders HDX RFID IC
Lifecycle:
New from this manufacturer.
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