TK5551M-PP Atmel, TK5551M-PP Datasheet - Page 8

• Manufacturer Part Number: TK5551M-PP
• Description: IC RFID 125KHZ READ/WRITE TAG
• Manufacturer: Atmel
• Series: TK5551r

Specifications of TK5551M-PP

• Rf Type: Read / Write
• Frequency: 125kHz
• Features: 264-bit EEPROM
• Package / Case: Plastic Package - 12mm L x 6mm W x 3mm H
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Figure 10-1. Ideal and Real Behavior Signals
11. Operating Distance
11.1
8
Anti-collision Mode by Password Request (AOR = Answer-On-Request)
TK5551
Gap detect
voltage
Coil
RF level reduces to zero immediately
Ideal behavior
Measured write-time frames of the IDIC demo kit software are:
Antennas with a high Q-factor require longer times for t
The maximum distance between the base station and the TK5551 depends mainly on the base
station, the coil geometries and the modulation options chosen (see “U2270B Antenna Design
Hints” and the “U2270B” data sheet). Under laboratory conditions, a distance of up to 9 cm can
be reached. For optimized distance, please refer to the application note. When using Atmel’s
U2270B demo board, the typical distances in the range of 0 cm to 5 cm can be achieved.
The AOR mode is an anti-collision procedure for transponders to read, e.g., 10 transponders in
the field during 500 ms (RF/32, maxblock 2). The number of transponders and the time to read
out are dependent on the application.
If the AOR mode has been configured by AOR bit at block 0, the transponder remains in sleep
mode while putting it into the field. If the specified AOR wake-up command is sent, the dedicated
transponder generates an internal RESET (see section “OP Code Formats” in the e5551 data
sheet). Due to the RESET the transponder is woken up. That means, the transponder is able to
modulate the field (read mode). The AOR wake-up command consists of the OP code and the
32-bit password. The time duration to send the AOR wake-up sequence is between 8.7 ms and
27.5 ms according to
values of the measured write-time frames and the content of the password. To select another
transponder in the field, it is necessary to send the stop OP code to stop the modulation of the
transponder.
t
1
1
t
t
t
t
gap
0
1
gap
= 180 µs to 400 µs
= 50 µs to 130 µs
= 270 µs to 390 µs
t
0
0
1
Figure
10-1. The time duration is dependent on the minimum/maximum
voltage
Gap detect
Coil
RF level decreases exponentially
Actual behavior
t
1 internal
1
t
1
gap
t
and shorter time values for t
gap
t
0
t
0
0 internal
1
4709G–RFID–07/10
0
and t
1
.