ATA557001C-DDB Atmel, ATA557001C-DDB Datasheet - Page 9

• Manufacturer Part Number: ATA557001C-DDB
• Description: IC IDIC SENSOR RW 1KBIT DIE
• Manufacturer: Atmel
• Series: -r

Specifications of ATA557001C-DDB

• Function: Read/Write
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Figure 4-3.
4.6
4.7
9191B–RFID–05/11
Reader-to-tag Communication
Start Gap
Sequence
Waveforms per different modulation types
FSK
Sequence terminator not suitable for Biphase or PSK modulation
Manchester
Atmel
®
e5550-compatible Sequence Terminator Waveforms
Data is written to the tag by interrupting the RF field with short field gaps (on-off keying) in
accordance with the Atmel e5550 write method. The time between two gaps encodes the “0”
or “1” information to be transmitted (pulse interval encoding). The duration of the gaps is usu-
ally 50µs to 150µs. The time between two gaps is nominally 24 field clocks for a “0” and 54
field clocks for a “1”. When there is no gap for more than 64 field clocks after a previous gap,
the Atmel ATA5570C exits the write mode. The tag starts with the command execution if the
correct number of bits were received. If there is a failure detected the Atmel ATA5570C does
not continue and will enter regular-read mode.
The initial gap is referred to as the start gap. This triggers the reader-to-tag communication.
During this mode of operation, the receive damping is permanently enabled to ease gap
detection. The start gap may need to be longer than subsequent gaps in order to be detected
reliably.
A start gap will be accepted at any time after the mode register has been loaded ( 3ms). A
single gap will not change the previously selected page (by former opcode “10” or “11”).
Figure 4-4.
V Coil PP
Bit period
Last bit
Start of Reader-to-tag Communication
Data "1"
Read mode
Modulation
Data "1"
off (on)
Data "1"
S
gap
d
1
Write mode
Modulation
Data "1"
off (on)
W
Atmel ATA5570C
gap
d
0
bit "1" or "0"
First Bit
9