ATA5577C
Read/Write LF RFID IDIC 100 to 150kHz
DATASHEET
Features
●
Contactless power supply
●
Contactless Read/Write data transmission
●
Radio frequency f
RF
from 100kHz to 150kHz
●
Basic Mode or Extended Mode
●
Compatible with Atmel
®
T5557, ATA5567
●
Replacement for Atmel 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)
●
7
32 bits EEPROM User Memory, including 32-bit Password Memory
●
2
32 bits for unique ID
●
1
32-bit option register in EEPROM to set up the Analog Front End:
●
Clock and gap detection level
●
Improved downlink timing
●
Clamp and modulation voltage
●
Soft modulation switching
●
Write damping like the Atmel T5557/ATA5567 or with resistor
●
Downlink protocol
●
1
32-bit configuration register in EEPROM to set up:
●
Data rate:
●
RF/2 to RF/128, binary selectable or
●
Fixed Basic Mode rates
●
Modulation/coding:
●
Bi-phase, Manchester, FSK, PSK, NRZ
●
Other options:
●
Password Mode
●
Max block feature
●
Direct Access Mode
●
Sequence terminator(s)
●
Blockwise write protection (lock bit)
●
Answer-On-Request (AOR) Mode
●
Inverse data output
●
Disable test mode access
●
Fast downlink (~6Kbits/s versus ~3Kbits/s)
●
OTP functionality
●
Init delay (~67ms)
9187H-RFID-07/14
●
High Q-antenna tolerance due to build in options
●
Adaptable to different applications: access control, animal ID and waste management
●
On-chip trimmed antenna capacitor:
●
250pF/330pF (±3%)
●
75pF/130pF (on request)
●
Without on-chip capacitor (on request)
●
Pad options
●
Atmel ATA5577M1C
●
100µm
100µm for wire bonding or flip chip
●
Atmel ATA5577M2C
●
200µm
400µm
for direct coil bonding
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ATA5577C [DATASHEET]
9187H–RFID–07/14
1.
Description
The Atmel
®
ATA5577C is a contactless read/write IDentification IC (IDIC
®
) for applications in the 125kHz or 134kHz
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.
2.
Compatibility
The Atmel ATA5577C is designed to be compatible with the Atmel T5557/ATA5567. The structure of the configuration
register is identical. The two modes, basic mode and extended mode, are also available. The Atmel ATA5577C is able to
replace the Atmel e5551/T5551 in most common operation modes. In all applications, the correct functionality of the
replacements must be evaluated and proved.
For further details, refer to the Atmel web site for product-relevant application notes.
3.
System Block Diagram
Figure 3-1. RFID System Using Atmel ATA5577C Tag
Transponder
Power
Reader
or
Base station
Coil interface
Controller
Memory
Data
1
)
Atmel ATA5577
1
) Mask option
ATA5577C [DATASHEET]
9187H–RFID–07/14
3
4.
Atmel ATA5577C - Functional Blocks
Figure 4-1. Block Diagram
AFE option register
Modulator
POR
Coil 1
Analog front end
Mode register
Write
decoder
Memory
(363-bit EEPROM)
Controller
1
)
Coil 2
Data-rate
generator
Input register
Test logic
HV generator
1
) Mask option
4.1
Analog Front End (AFE)
The AFE includes all circuits that are directly connected to the coil terminals. It generates the IC's power supply and handles
the bi-directional data communication with the reader. It consists of the following blocks.
●
Rectifier to generate a DC supply voltage from the AC coil voltage
●
●
●
●
Clock extractor
Switchable load between Coil1 and Coil2 for data transmission from the tag to the reader
Field-gap detector for data transmission from the base station to the tag
ESD-protection circuitry
4.2
AFE Option Register
The option register maintains a readable shadow copy of the data held in the EEPROM block 3, page 1. This contains the
analog front end's level and threshold settings, as well as enhanced downlink protocol selection with which the device can be
fine tuned for perfect operation and all application environments. It is continually refreshed during read-mode operation and
(re)-loaded after every power-on reset (POR) event or reset command. By default, the option register is pre-programmed
according to
Table 10-1 on page 39.
4.3
Data-rate Generator
The data rate is binary programmable to operate at any even-numbered data rate between RF/2 and RF/128, or to any of the
fixed, basic-mode data rates (RF/8, RF/16, RF/32, RF/40, RF/50, RF/64, RF/100 and RF/128).
4.4
Write Decoder
The write decoder detects the write gaps and verifies the validity of the data stream according to the Atmel
®
e555x downlink
protocol (pulse interval encoding).
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ATA5577C [DATASHEET]
9187H–RFID–07/14
4.5
HV Generator
This on-chip charge pump circuit generates the high voltage required to program the EEPROM.
4.6
DC Supply
Power is supplied to the IDIC externally via the two coil connections. The IC rectifies and regulates this RF source, and uses
it to generate its supply voltage.
4.7
Power-On Reset (POR)
The power-on reset (POR) circuit blocks the voltage supply to the IDIC until an acceptable voltage threshold has been
reached.
4.8
Clock Extraction
The clock extraction circuit uses the external RF signal as its internal clock source.
4.9
Controller
The control logic module executes the following functions:
●
Load mode register with configuration data from EEPROM block 0 after power on and during reading
●
●
●
Load option register with the settings for the analog front end stored in EEPROM page 1, block 3 after power on and
during reading
Control all EEPROM memory read/write access and data protection
Handles the downlink command decoding detecting protocol violations and error conditions
4.10
Mode Register
The mode register maintains a readable shadow copy of the configuration data held in block 0 of the EEPROM. It is
continually refreshed during read mode and (re-)loaded after every POR event or reset command. On delivery, the mode
register is pre-programmed according to
Table 10-1 on page 39.
4.11
Modulator
The modulator encodes the serialized EEPROM data for transmission to a tag reader or base station. Several types of
modulation are available including Manchester, bi-phase, FSK, PSK, and NRZ.
ATA5577C [DATASHEET]
9187H–RFID–07/14
5
