LRI64 datasheet(14/38 Pages) STMICROELECTRONICS

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LRI64

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LRI64 STATES

A LRI64 can be in any one of three states:

–

Power-off

–

Ready

–

Quiet

Transitions between these states are as specified

in Figure 20.

Power-off State

The LRI64 is in the Power-off state when it re-

ceives insufficient energy from the VCD.

Ready State

The LRI64 is in the Ready state when it receives

enough energy from the VCD. It answers to any

Request

Addressed

and

Non-addressed

modes.

Quiet State

When in the Quiet State, the LRI64 answers to any

Request in Addressed mode.

MODES

The term mode refers to the mechanism for spec-

ifying, in a Request, the set of LRI64 devices that

shall answer to the Request.

Addressed Mode

When the Address_flag is set to 1 (Addressed

mode), the Request contains the Unique ID (UID)

of the addressed LRI64 device (such as an LRI64

device). Any LRI64 receiving a Request in which

the Address_flag is set to 1, compares the re-

ceived Unique ID to its own UID. If it matches, it

execute the Request (if possible) and returns a

Response to the VCD, as specified by the com-

mand description. If it does not match, the LRI64

device remains silent.

Non-Addressed Mode (General Request)

When the Address_flag is set to 0 (Non-addressed

mode), the Request does not contain a Unique ID

field. Any LRI64 device receiving a Request in

which the Address_flag is set to 0, executes the

Request and returns a Response to the VCD as

specified by the command description.

Figure 20. LRI64 State Transition Diagram

AI09723

Power Off

In field

Out of

field

Write, Read, Get_System_Info

in addressed mode

Stay quiet(UID)

Out of

field

Inventory (if UID written)

Write, Read, Get_System_Info

in addressed and

non-addressed modes

Ready

Quiet

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