Nxp ntag NT3H2111_2211

[fcrudo]

Hi.

I am developing a product with Nxp NTAG: https://www.nxp.com/docs/en/data-sheet/NT3H2111_2211.pdf For some reasons I need to power off component via software (it is attached to i2c bus).

Is possibile power off module via software in order to avoid to modify schematic breaking Vcc wire?

Thanks and regards.

Fabrizio.

[Julián_AragónM]

Hi @fcrudo,

The NT3H2111 t has its own form of soft reset as described in Datasheet, page 39, chapter "9.3 I²C soft reset and NFC silence feature", which is a soft reset of the I2C subsystem, and NFC disable, in which the NFC demodulator is disabled.

if NFCS_I2C_RST_ON_OFF is set, the I2C soft reset feature interprets an I2C repeated start (no I2C stop in between) as a command to execute a soft reset of the I2C subsystem.

Do you need to power off the NTAG for energy consumption?

Best regards,
Julián.

[fcrudo]

Hi Julián.

Thanks a lot for response.

Reading manual seems that NFCS_I2C_RST_ON_OFF is perfect for my target.

I will try to change and test if  NFC demodulator will be disabled.

Do you need to power off the NTAG for energy consumption?

No, I need to disable nfc for specific period and enable when some development will be ready.

Regards.

Fabrizio 

[fcrudo]

Hi.

To do this could be set to 1 7th bit  (NFCS_I2C_RST_ON_OFF) of NC_REG register?

Thanks in advance for response.

Fabrizio.

[Frzn_Solid]

You would set the first byte at I2C address 0x3A (NC_REG register) to 0x81 because bit 0 (TRANSFER_DIR) has the default value of 0b1, therefore the register looks like 0b1000 0001 (0x81)