Atmel T5577 Proximity Card

The ATA5577 is a contactless read/write identification IC (IDIC®) for applications in
the 125-kHz or 134-kHz frequency band. A single coil connected to the chip serves as
the IC’s power supply and bi-directional communication interface. The antenna and
chip together form a transponder or tag.
The on-chip 363-bit EEPROM (11 blocks with 33 bits each) can be read and written
block-wise from a base station (reader).
Data is transmitted from the IDIC (uplink) using load modulation. This is achieved by
damping the RF field with a resistive load between the two terminals Coil 1 and Coil 2.
The IC receives and decodes serial base station commands (downlink), which are
encoded as 100% amplitude modulated (OOK) pulse-interval-encoded bit streams.
A complete datasheet with further technical data is available on request. Please contact your local sales office.

Atmel T5577 Proximity Card

• Contactless Power Supply
• Contactless Read/Write Data Transmission
• Radio Frequency fRF from 100 kHz to 150 kHz
• Basic Mode or Extended Mode
• Compatible with T5557, ATA5567
• Replacement for e5551/T5551 in Most Common Operation Modes
• Configurable for ISO/IEC 11784/785 Compatibility
• Total 363 Bits EEPROM Memory: 11 Blocks (32 Bits + 1 Lock Bit)
• High Q-antenna Tolerance Due to Build in Options
• Adaptable to Different Applications: Access Control, Animal ID and Waste
• On-chip Trimmed Antenna Capacitor
• Pad Options
– ATA5577M1
• 100 µm × 100 µm for Wire Bonding or Flip Chip
– ATA5577M2
• 200 µm × 400 µm for Direct Coil Bonding


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