M24LR04E-R datasheet(28/142 Pages) STMICROELECTRONICS

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System memory area

M24LR04E-R

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Doc ID 022208 Rev 5

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Energy harvesting enable control

Delivery of Energy harvesting analog output voltage on the Vout pin depends on the value of

the EH_enable bit of the volatile Control register (see Table 15).

–

When set to 1, the EH_enable bit enables the Energy harvesting mode, meaning

that the Vout analog output signal is delivered when the PAC0-AC1_min and Isink_max

conditions corresponding to the chosen sink current configuration bit are met (see

Table 125).

–

When set to 0, the EH_enable bit disable the Energy harvesting mode and the

analog output Vout remains in set in High-Z state.

●

Energy harvesting default mode control

At power-up, in I²C or RF mode, the EH_enable bit is updated according to the value of the

EH_mode bit stored in the non-volatile Configuration byte (see Table 16). In other words, the

EH_mode bit is used to configure whether the Energy harvesting mode is enabled or not by

default.

4.3.3

FIELD_ON indicator bit

The FIELD_ON bit indicator located as Bit 1 of the Control register is a read-only bit used to

indicate when the RF power level delivered to the M24LR04E-R is sufficient to execute RF

commands.

●

When FIELD_ON = 0, the M24LR04E-R is not able to execute any RF commands.

●

When FIELD_ON =1, the M24LR04E-R is able to execute any RF commands.

Note:

During read access to the Control register in RF mode, the FIELD_ON bit is always read

at 1.

Table 15.

Control register

I2C byte address

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

BIT 1

BIT 0

E2=1

2336

0(1)

Bit 7 to Bit 1 are read-only bits.

0(1)

FIELD_ON(1)

EH_enable

Table 16.

EH_enable bit value after power-up

EH_mode value

EH_enable after power-up

Energy harvesting

after power-up

enabled

disabled

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