AN3057 datasheet(11/15 Pages) STMICROELECTRONICS

11 / 15 page

AN3057

Recommendations when developing the M24LRxx application software

Doc ID 16239 Rev 4

11/15

Figure 9.

M24LRxx state transition diagram

The M24LRxx returns to the “Power-off” state only when both conditions are met: the VCC pin is not

supplied (0 V or Hi-Z) and the tag is outside the RF field.

The M24LRxx reverts to the Power-off state only when the two following conditions are met:

●

the M24LRxx is outside the RF field

●

its VCC pin is not supplied (VCC = 0 V or Hi-Z)

If the M24LRxx is outside the RF field with its VCC pin powered, it retains its internal state

(either “Quiet” or “Selected”, as shown in Figure 9). This means that when the M24LRxx re-

enters the RF field, it might not answer further RF requests properly.

AI06681b

Power Off

In field

Out of field

Ready

Quiet

Selected

Any other Command

where Select_Flag

is not set

Out of RF field

and(1) no DC

power supply

Stay quiet(UID)

Select (UID)

Any other command

Any other command where the

Address_Flag is set AND

where Inventory_Flag is not set

Out of RF field

and(1) no DC

power supply

AN3057 Datasheet(PDF) 11 Page - STMicroelectronics