T5557

• Contactless Read/Write Data Transmission
• Radio Frequency fRF from 100 kHz to 150 kHz
• e5550 Binary Compatible or T5557 Extended Mode
• Small Size, Configurable for ISO/IEC 11784/785 Compatibility
• 75 pF On-chip Resonant Capacitor (Mask Option)
• 7 x 32-bit EEPROM Data Memory Including 32-bit Password
• Separate 64-bit memory for Traceability Data
• 32-bit Configuration Register in EEPROM to Setup:Data Rate- RF/2 to RF/128, Binary Selectable or- Fixed e5550 Data Rates Modulation/Coding- FSK, PSK, Manchester, Biphase, NRZ Other Options- Password Mode- Max Block Feature- Answer-On-Request (AOR) Mode- Inverse Data Output- Direct Access Mode- Sequence Terminator(s)- Write Protection (Through Lock-bit per Block)- Fast Write Method (5 kbps versus 2 kbps)- OTP Functionality- POR Delay up to 67 ms

The T5557 is a contactless R/W IDentification IC (IDIC
) for applications in the125 kHz frequency range. A single coil, connected to the chip, serves as the IC'spower supply and bi-directional communication interface. The antenna and chiptogether form a transponder or tag.

The on-chip 330-bit EEPROM (10 blocks, 33 bits each) T5557 can be read and written block-wise from a reader. Block 0 is reserved for setting the operation modes of the T5557tag. Block 7 may contain a password to prevent unauthorized writing.Data is transmitted from the IDICusing load modulation. This is achieved by dampingthe RF field with a resistive load between the two terminals Coil 1 and Coil 2. The T5557 receives and decodes 100% amplitude modulated (OOK) pulse interval encoded bitstreams from the base station or reader.