ATA5570 ATMEL Corporation, ATA5570 Datasheet - Page 12

• Manufacturer Part Number: ATA5570
• Description: Multifunctional 330-bit Read/write RF Sensor Identification IC
• Manufacturer: ATMEL Corporation

Figure 5-6.
5.9
5.10
12
Password
Answer-on-request (AOR) Mode
Standard write
Direct access (PWD = 1)
Direct access (PWD = 0)
Page 0/1 regular read
AOR (wake-up command)
Reset command
Protected write
ATA5570 [Preliminary]
ATA5570 Command Formats
When password mode is active (PWD = 1), the first 32 bits after the opcode are regarded as the
password. They are compared bit-by-bit with the contents of block 7, starting at bit 1. If the com-
parison fails, the ATA5570 will not program the memory, instead it will restart in regular-read
mode once the command transmission is finished.
Note:
Each transmission of the direct access command (two opcode bits, 32 bits password, “0” bit plus
3 address bits = 38 bits) needs about 18 ms. Testing all possible combinations (about 4.3 billion)
would take about two years.
When the AOR bit is set, the ATA5570 does not start modulation in the regular-read mode after
loading configuration block 0. The tag waits for a valid AOR data stream (“wake-up command”)
from the reader before modulation is enabled. The wake-up command consists of the opcode
(“10”) followed by a valid password. The selected tag will remain active until the RF field is
turned off or a new command with a different password is transmitted which may address
another tag in the RF field.
In password mode, MAXBLK should be set to a value below 7 to prevent the password from being
transmitted by the ATA5570.
1p*
1p* L
1p *
1p*
1p*
OP
10
00
1
1
1
0
1
2 Addr
Password
Password
Password
0
Data
32
32
32
* p = page selector
32
L
0
2 Addr
1
2 Addr
0
0
Data
32
2 Addr
4863A–RFID–07/05
0