RF - I²C arbitration mechanism description

AN3057

8/15

Doc ID 16239 Rev 4

Figure 7.

Example of an Inventory command where the M24LRxx is decoded in

Slot 13

2.2.3

Arbitration

When both interfaces are active (as defined in Case 3 in Table 2: Four possible

combinations of power supply sources), the M24LRxx decodes and executes the first

received command, as detailed in Table 3: Possible cases of communication arbitration.

SOF

Request

EOF

RF busy

ai17505

EOF

EOF

Response

EOF

Slot 1

Slots 2 to 12

Slot 13

Table 3.

Possible cases of communication arbitration

Initial state

Event

M24LRxx action

active and an I²C command is being

decoded or executed

RF command transmitted during an

I²C command

RF command is not

decoded

M24LRxx is in the RF busy state: an RF

command is being decoded or

executed

transmitted during an RF command

I²C command is not

decoded