ATA559001-6DSY Atmel, ATA559001-6DSY Datasheet - Page 29

• Manufacturer Part Number: ATA559001-6DSY
• Description: RF Wireless Misc UHF (1k bit r/w anti-collision)
• Manufacturer: Atmel

Specifications of ATA559001-6DSY

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.9.2
4.9.3
4817C–RFID–03/07
RF Field On
Start State
When a tag enters an RF field, and the RF field strength (in respect to the resonant frequency of
the antenna and its bandwidth) is above a certain value, the reset circuit generates a power-on
reset (POR). After POR the on-chip oscillator is switched on.
If the RF field has reached a minimum power level, and the power-on reset is finished, the tag IC
changes to the start state.
After POR, the circuit generates a refresh procedure for the status1 register (pre_select, ID,
ID_s). Then it reads the configuration of the chip out of memory. Based on the configuration, it
enables or disables the trigger function. The detection of a first modulation tick (RSSI circuit) is
enabled after configuration.
After enabling the RSSI circuit, the tag waits for a first modulation dip. The trigger function stops
after receiving a first modulation dip.
Figure 4-12. Start State
states
Other
ID_s = 0
configu-
Trigger enabled
ration
Load
command
Reset
Trigger
active
Refresh
status1
no Trigger
Oscillator is
active
ready
Forward_en = 1
observe
Go to
oscillator
Start
ID_s (status1)
POR time
over
is set
Go to
mute
ATA5590
RF_on
state
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