ATA5575M2 [DATASHEET]
9217F–RFID–12/14
6
5.1.2 Modulation
The modulator consists of data encoders for the following types of modulation.
5.1.3 ID Length
The Atmel® ATA5575M2 offers settings for different ID lengths. If bit 8 of byte 16 is set to '1', the ID length is 128 bits.
Depending on the modulation scheme, resetting bit 8 of byte 16 to '0' leads either to the ID length of 64 bit with differential bi-
phase coding or to the ID length of 96 bit with FSK2 coding respectively.
5.2 Animal ID and Traceability
During Atmel’s production process the Atmel ATA5575M2 will be pre-configuered in the ISO11784/11785 FDX-B mode and
a unique ID (UID) will be stored in the user memory. The unique ID consists of Atmel’s production information like lot
number, wafer number, and die-on-wafer number. With these data each chip can be traced and concurrently each chip has
its own unique ID for identification purposes(1).
For ISO11784/11785 FDX-B telegrams please refer to Section 7. “Examples for Programming the ATA5575M2” on page 14.
Section 10.2 “ATA5575M2 Configuration on Delivery” on page 18 describes how the unique ID is formed based on Atmel
production information.
Note: 1. Please note that this traceability data is only for production control and does not conform with any ISO, national
or other regulations.
5.3 Tag-to-reader Communication (Uplink)
Immediately after entering the reader field, generating the internal supply voltage and the analog POR, in the delivery state
the tag cycles its data stored in EEPROM by load modulation according to the configuration setting. This resistive load
modulation can be detected at the reader device.
5.3.1 Regular-read Mode
In regular-read mode data from the memory is transmitted in series, starting with byte 0, bit 1, up to the last byte, bit 8. Last
byte is defined in bit 8 of byte 16, ID Length. When the last bit of the last byte (defined by ID length) has been read, data
transmission restarts with byte 0, bit 1.
The device enters regular-read mode in delivery state (lock bits set to '00001b' or set to '01101b'; please refer to Section
5.1.1 “Lock-bits” on page 5).
Last byte is 15, when ID Length = 1 (128 bit).
For differential bi-phase modulation, the last byte is 7 when ID Length = 0 (64 bits) is chosen.
For FSK2 RF/50 modulation, the last byte is 11 when ID length = 0 (96 bits) is chosen.
Every time the Atmel ATA5575M2 enters regular or byte read mode, the first bit transmitted is a logical '0'. The data stream
starts with bit 1 of byte 0 or bit 1 of the addressed byte.
Table 5-2. Atmel ATA5575M2: Types of Modulation
Symbol Direct Data Output Encoding
FSK2 RF/50 FSK/10 – FSK/8 0 = RF/10 1 = RF/8
Differential bi-phase Transition at each bit start
0 creates an additional mid-bit change