SE050 power supply unclear

[frankbuss2]

In this datasheet:

https://www.nxp.com/docs/en/data-sheet/SE050-DATASHEET.pdf

in chapter 3.4 it is written "If a supply voltage is applied to pins Vin, Vcc within the specified supply voltage operating range or a RF field according to ISO/IEC 14443 is applied to antenna pins LA, LB the IC boots up."

Does this mean "Vin or Vcc", or "Vin and Vcc"? I guess it would make sense that I can connect Vcc to 3.3V to power it, when I don't need the deep power down mode. This would make sense, because in chapter 5.2 it says, that I must connect Vout to Vcc, but it is not clear to me from the datasheet wording.

And this is what I can see in my circuit. I have connected only Vin to 3.3V, and it doesn't work. Only when I connect Vout to Vcc as well, and go out of deep power mode with ENA high, then I can get an acknowledge when I try to send a write request to the 0x48 I2C address.

Also is there a register level and command description what I can send over I2C? I didn't find any datasheet with this information, except for the device address.

[Kan_Li · Accepted solution]

Hi @frankbuss2 ,

Please kindly have my comments as below:

Does this mean "Vin or Vcc", or "Vin and Vcc"? 

- It depends, if you want to have the deep power down mode, you need connect Vin with the power supply and Vout with Vcc, otherwise, Both Vin and Vcc are connected with the power supply, and Vout is NC.

Also is there a register level and command description what I can send over I2C? I didn't find any datasheet with this information, except for the device address.

- The device accepts APDU commands sent within the format of T1oI2c spec, you may refer to the following links for more details.

https://www.nxp.com/webapp/Download?colCode=AN12543

https://www.nxp.com/webapp/Download?colCode=UM11225

Hope that helps,

Have a great day,
Kan

-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!
- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
-------------------------------------------------------------------------------