2017-08-09 06:01 AM
My application will use NFC to either
I appreciate that I2C may need 10 clocks or something to recover from being in the wrong mode. That is fine.
Solved! Go to Solution.
2017-08-21 07:11 AM
Hi
Lohmann.Andrew
,In the M24LR
http://www.st.com/resource/en/datasheet/m24lr04e-r.pdf
you will found useful information about supply voltage and power conditions. in section 2.6Table 118 informs about operating conditions also. If VCC is under 1.8V I2C (digital part) will not be activated.
The Analog RF doesn't need VCC to be operational, it uses power from the Reader field.
Hope this will help you.
Best Regards.
2017-08-14 05:41 AM
I think the answer is that the I2C bus pins can be low when VCC of the NFC is low. It can't be any other way?
Vout must not be held low eg because the power demanded by other things is too high or else the NFC can not operate in Passive mode. This means I will have to add a power switch of some kind?2017-08-21 07:11 AM
Hi
Lohmann.Andrew
,In the M24LR
http://www.st.com/resource/en/datasheet/m24lr04e-r.pdf
you will found useful information about supply voltage and power conditions. in section 2.6Table 118 informs about operating conditions also. If VCC is under 1.8V I2C (digital part) will not be activated.
The Analog RF doesn't need VCC to be operational, it uses power from the Reader field.
Hope this will help you.
Best Regards.