M24LR64E-R datasheet(28/140 Pages) STMICROELECTRONICS

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M24LR64E-R

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Doc ID 022712 Rev 3

4.3.1

RF WIP/BUSY pin configuration

The M24LR64E-R features a configurable open drain output RF WIP/BUSY pin used to

provide RF activity information to an external device.

The RF WIP/BUSY pin functionality depends on the value of bit 3 of the Configuration byte.

●

RF busy mode

When bit 3 of the Configuration byte is set to 0, the RF WIP/BUSY pin is configured in RF

busy mode.

The purpose of this mode is to indicate to the I²C bus master whether the M24LR64E-R is

busy in RF mode or not.

In this mode, the RF WIP/BUSY pin is tied to 0 from the RF command Start Of Frame (SOF)

until the end of the command execution.

If a bad RF command is received, the RF WIP/BUSY pin is tied to 0 from the RF command

SOF until the reception of the RF command CRC. Otherwise, the RF WIP/BUSY pin is in

high-Z state.

When tied to 0, the RF WIP/BUSY signal returns to High-Z state if the RF field is cut-off.

During the execution of I²C commands, the RF WIP/BUSY pin remains in high-Z state.

●

RF Write in progress

When bit 3 of the Configuration byte is set to 1, the RF WIP/BUSY pin is configured in RF

Write in progress mode.

The purpose of this mode is to indicate to the I²C bus master that some data has been

changed in RF mode.

In this mode, the RF WIP/BUSY pin is tied to 0 for the duration of an internal write operation

(i.e. between the end of a valid RF write command and the beginning of the RF answer).

During the execution of I²C write operations, the RF WIP/BUSY pin remains in high-Z state.

4.3.2

Energy harvesting configuration

The M24LR64E-R features an Energy harvesting mode on the Vout analog output.

The general purpose of the Energy harvesting mode is to deliver a part of the non-

necessary RF power received by the M24LR64E-R on the AC0-AC1 RF input in order to

supply an external device. The current consumption on the analog voltage output Vout is

limited to ensure that the M24LR64E-R is correctly supplied during the powering of the

external device.

When the Energy harvesting mode is enabled and the power delivered on the AC0-AC1 RF

input exceeds the minimum required PAC0-AC1_min, the M24LR64E-R is able to deliver a

limited and unregulated voltage on the Vout pin, assuming the current consumption on the

Vout does not exceed the Isink_max maximum value.

If one of the conditions above is not met, the analog voltage output pin Vout is set in High-Z

state.

For robust applications using the Energy harvesting mode, four current fan-out levels can be

chosen.

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