M24LR04E-R datasheet(27/142 Pages) STMICROELECTRONICS

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M24LR04E-R

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

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

4.3.2

Energy harvesting configuration

The M24LR04E-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 M24LR04E-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 M24LR04E-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 M24LR04E-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 condition 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.

●

Vout sink current configuration

The sink current level is chosen by programming EH_cfg1 and EH_cfg0 into the

Configuration byte (see Table 14).

The minimum power level required on AC0-AC1 RF input PAC0-AC1_min, the delivered

voltage Vout, as well as the maximum current consumption Isink_max on the Vout pin

corresponding to the <EH_cfg1,EH_cfg0> bit values are described in Table 125.

Table 14.

Configuration byte

I2C byte address Bit 7 Bit 6 Bit 5 Bit 4

Bit 3

Bit 2

BIT 1

BIT 0

E2=1

2320

X(1)

Bit 7 to Bit 4 are don’t care bits.

X(1)

RF WIP/BUSY

EH_mode EH_cfg1 EH_cfg0

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