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AT88RF001 데이터시트 PDF




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부품번호 AT88RF001 기능
기능 RFID External EEPROM Interface IC
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AT88RF001 데이터시트, 핀배열, 회로
Features
13.56 MHz ± 7 kHz RFID Interface for Multi-chip Cards and Tags
Electrically Compatible with ISO/IEC 14443-2, Type B
Serial Channel Configurable to Communicate with External Chips
Supports SPI and Two-wire Serial EEPROM Interface
320 Read/Write EEPROM Bits, Divided into 10 Pages of 32 Bits
Password and Write Lock Protection
Programmable Send Protocols
Integrated Tuning Capacitor
ID Length Programmable from 4 to 18 Bytes
Optional 2-byte CRC
Description
The AT88RF001 is a stand-alone 13.56 MHz RFID front end that includes a serial port
suitable for connection to an external high-density serial memory. Using the on-board
EEPROM, it can be configured to communicate using various protocols and interface
to both two-wire and SPI external devices.
The device contains 320 bits of full read/write EEPROM memory and offers features
such as passwords, locking and a variable-length ID. It is electrically compatible with
ISO/IEC 14443-2, Type B. The IC includes an internal tuning capacitor; only an exter-
nal coil antenna is required to complete the RFID channel.
The serial channel is configurable to communicate with external ICs using either two-
wire or four-wire (SPI) serial channels, at a maximum speed of 106 kilobits per second
(Kbps). An external bypass capacitor will be required to filter and stabilize the supply
generated by the RFID front end. Up to 2 mA can be drawn by the external memory
when communications are not occurring.
Figure 1. Block Diagram
RFID External
EEPROM
Interface IC
AT88RF001
VSS
VDD
Bridge
Rectifier
Regulator
Clock
Extraction
Data
Modulation
Control
EEPROM
Serial Clock
Chip Select
Data Output
Data Input
The AT88RF001 is intended to be used with serial EEPROMs such as Atmel’s
AT24Cxx two-wire line or its AT25xx SPI line. In addition, it can communicate with an
external microprocessor if more complicated systems are to be built, if software on
that processor can model the slave protocol of the corresponding memories. It is
expected that a single external memory chip will be connected to the AT88RF001.
Rev. 1943F–RFID–04/02
1




AT88RF001 pdf, 반도체, 판매, 대치품
External Memory Access
The Send and Get commands transfer data from the RFID port to the serial I/O channel
bit by bit, using the proper protocol for the external memory as defined by the
SERIAL_MODE bits in the options page. The Send/Get Page commands transfer a
number of bytes as set in the options page, which could correspond to the page size in
the external memory. Any sequencing required in the external memory to perform writes
or other housekeeping should be performed with a series of Send/Get commands,
either as single bytes or as combinations of byte and page commands.
All Send/Get data commands to the external memory should be preceded with a start
sequence that is initiated with the Send Begin command. External memory operations
should be terminated with the Send End command. In two-wire mode, these commands
correspond to the start and stop conditions. In SPI mode, the Begin/End commands
assert and deassert the CS pin to the external memory.
If extra security is required before access to the external memory, the IC can be config-
ured such that the password must be entered before the Send Begin command will be
executed. Without this command being executed, accesses to the external memory can-
not happen.
After any Send, Get or Check Password command has properly executed, the IC enters
an infinite listening window during which additional commands can be sent to the IC.
After subsequent Send, Get or Check Password commands have been executed and/or
if illegal commands are sent to the device, it will return to this infinite listening window.
After subsequent internal memory access commands have been executed, the IC will
acknowledge the command by repeatedly transmitting the page accessed. Subsequent
illegal commands will result in the power-up ID transmission.
After any Send command that is received correctly (including encoding and/or CRC)
and acknowledged by the external memory, the IC will send a single-byte acknowledge
frame back to the reader in the form of a single byte of value 0xFF (and CRC, if
enabled).
In the case of the Send Begin/Send End commands, the absence of an acknowledge
response from the IC means that the various pin transitions to the external memory did
not occur at all. In the case of the other external memory access commands, the IC will
stop transitions to the external memory at the point of failure, and the reader must deter-
mine the proper course of action to recover the external memory state.
After the Send End command is initiated, the command encoding may specify that a
delay occurs after the acknowledge is sent back to the reader. Because of the architec-
ture of the power generation circuitry, it is recommended that these delays be used
whenever writes will be taking place within the external memory. During the delay time,
the IC will be configured to supply extra power to the external memory device, and com-
munications to the AT88RF001 will be disabled during the delay period.
The system can send any command (either external or internal memory access) during
any listening window. To return to the default state and transmit the ID, the carrier power
can be cycled off and on.
4 AT88RF001
1943F–RFID–04/02

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AT88RF001 전자부품, 판매, 대치품
Type B Frame Mode
AT88RF001
All commands and data sent to the IC shall be received in the following format:
1. Start of Transmission (SOT) (see below for Type B SOT definition).
2. One command byte (1 logic “0” start bit + 8 command bits + 1 logic “1” stop bit +
EGT(1)).
3. N data bytes: N*(1 logic “0” start bit + 8 data bits + 1 logic “1” stop bit + EGT(1)) N
0.
4. (Optional) Two CRC bytes in the same format as above (3).
5. End of Transmission (EOT) (see below for Type B EOT definition).
Note: 1. The EGT (Extra Guard Time) is an integer of 0–6 additional logic “1”s transmited after
the stop bit.
Figure 2. Type B Frame Format – Reader/Writer to Card
SOT
b1...b8
b1...b8
EOT
Start
Stop EGT Start
Stop EGT
Command Byte
Repeat for n Data
Bytes and (optional)
2 CRC Bytes
All data sent from the IC to the reader/writer will be transmitted in the following format:
1. Start of Transmission (SOT).
2. N data bytes: N*(1 logic “0” start bit + 8 data bits + 1 logic “1” stop bit + 1 EGT(1)
bit) N1.
3. (Optional) Two CRC bytes in the same format as above (2).
4. End of Transmission (EOT).
Note: 1. The EGT (Extra Guard Time) bit transmitted from the IC to the reader/writer is a logic
“1”.
Figure 3. Type B Frame Format – IC to Reader/Writer (N Data Bytes)
SOT
b1...b8
EOT
Start
Stop EGT
Repeat for n Data Bytes
and (optional) 2 CRC Bytes
1943F–RFID–04/02
7

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