Rainbow Electronics ATA5575M1 User Manual
Features
• Contactless Power Supply
• Contactless Read/Write Data Transmission
• Radio Frequency f
• 128-bit EEPROM User Memory: 16 Bytes (8 Bits Each)
• 8-bit Configuration Memory
• High Q-antenna Tolerance Due to Built-in Options
• Applications
– Access Control
• Standard Unique Format (Manchester, RF/64)
• 40-bitData Memory
• 14-bit Parity Memory
• 9-bit Header Memory
• On-chip Trimmed Antenna Capacitor
– 330 pF ±3%
– 250 pF ±3%
• Mega Pads 200 µm × 400 µm
• Mega Pads 200 µm × 400 µm with 25 µm Gold Bumps for Direct Coil Bonding
• Other Options:
– Direct Access Mode
– OTP Functionality
from 100 kHz to 150 kHz
RF
1. Description
The ATA5575 is a contactless read/write identification IC (IDIC®) for applications in
the 100-kHz to 150-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.
Read/Write
LF RFID IDIC
100 kHz to
150 kHz
ATA5575M1
Summary
Preliminary
The on-chip 128-bit user EEPROM (16 bytes with 8 bits each) can be read and written
byte-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.
The ATA5575 is an EEPROM-based circuit. It is optimized for maximum read range.
Programming is also possible, but the write range is limited.
The chip has to be locked after loading the application-specific data into the device.
Until the enable bits are set properly, the ATA5575M1 transmits all digits “0” in unique
format. Typical applications run at 125 kHz.
NOTE: This is a summary document.
The complete document is available.
For more information, please contact
your local Atmel sales office.
9167AS–RFID–11/09
2. System Block Diagram
Data
Reader
or
Base station
ATA5575
Power
Tr ansponder
Coil interface
Controller
Memory
Memory
(136-bit EEPROM)
Modulator
Analog front end
Data-rate
generator
Write
decoder
POR
Coil 2
Coil 1
Controller
Te st logic HV generator
Input register
Mode register
Figure 2-1. RFID System Using ATA5575 Tag
3. ATA5575 - Functional Blocks
Figure 3-1. Block Diagram
2
ATA5575M1 [Preliminary]
9167AS–RFID–11/09
4. Analog Front End (AFE)
The AFE includes all circuits which are directly connected to the coil terminals, it generates the
IC’s power supply and handles the bi-directional data communication with the reader. The
AFE consists of the following blocks:
• Rectifier to generate a DC supply voltage from the AC coil voltage
• Clock extractor
• Switchable load between Coil 1 and Coil 2 for data transmission from tag to the reader
• Field-gap detector for data transmission from the base station to the tag
• ESD protection circuitry
4.1 Data Rate Generator
The data rate is fixed to RF/64.
4.2 Write Decoder
The write decoder detects the write gaps and verifies the validity of the data stream according
to the Atmel
ATA5575M1 [Preliminary]
®
downlink protocol (pulse interval encoding).
4.3 HV Generator
This on-chip charge pump circuit generates the high voltage required for programming the
EEPROM.
4.4 DC Supply
Power is externally supplied to the IDIC via the two coil connections. The IC rectifies and regulates this RF source and uses it to generate its supply voltage.
4.5 Power-On Reset (POR)
The power-on reset circuit blocks the voltage supply to the IDIC until an acceptable voltage
threshold has been reached. This, in turn, triggers the default initialization delay sequence.
During this configuration period of 98 field clocks, the ATA5575 is initialized with the configuration data stored in EEPROM byte 16.
4.6 Clock Extraction
The clock extraction circuit uses the external RF signal as its internal clock source.
4.7 Controller
The control logic module executes the following functions:
• Load mode register with configuration data from EEPROM byte 16 after power-on and
during reading
• Controls each EEPROM memory read/write access and handles the data protection
• Handle the downlink command decoding, detecting protocol violations and error conditions
9167AS–RFID–11/09
3
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