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iCLASS SE Reader Module Hardware Developer Guide, SE3200-902, Rev B.0
October 2012
Page 37 of 42
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Tf
Fall Time
Fall Time
610ns
Modulation Index
12.50%
Overshoot
0.2 %
Undershoot
0.1%
7.3.6 Power Considerations
If a transponder is presented to the 4090A10 HF antenna, the impedance of the antenna is
bound to change. The magnitude of the impedance change depends on various factors like
Geometrical relationship between the antennas (coupling)
Impedance/power consumption of transponder
…
This leads to a change in power consumption of the reader. The following table provides an
Geometrical relationship between the antennas (coupling)
Impedance/power consumption of transponder
…
This leads to a change in power consumption of the reader. The following table provides an
overview on power consumptions recorded with different transponders.
Table 23: Power Considerations
Table 23: Power Considerations
Mode
Parameter
Min
Typ
Max
Unit
- iCLASS card in 10mm
distance
- Polling for HF transponders
in autonomous mode*1
- No Prox
Average DC current at 20°C
120
mA
- iCLASS card in 50mm
distance
90
mA
- iCLASS card in 70mm
distance
45
mA