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RF430FRL152HEVM: I²C communication at 1.5V voltage supply

Gaetan Andrieu
Prodigy 20 points
Part Number: RF430FRL152HEVM
Other Parts Discussed in Thread: RF430FRL152H

Hi,

Context : I'm trying to use your development kit RF430FRL152HEVM with Vbat =1.5V in order to run an I²C communication with an external sensor, to read the value and to save it in the ROM. Then, when the device is not being supplied by Vbat, I want to read the information of the sensor saved in the ROM via the NFC.

My sensor is working with signal that toogles from 0V to 1.5V, so I removed the level shifter on the developpement kit to access directly to the I²C pin's signals of the RF430FRL152H. I also needed to apply a voltage supply of 1.5V on RST/NMI in order to feed the integrated circuit. But when I do that, the voltage of 1.5V which is the high voltage reference of the I²C communication decreases over the time (SDA & SCL), then the high voltage reference is lowering from 1.2V to 900 mV, why not a stable 1.5V ?

I would like to know if you have any solutions to run the RF430FRL152H with a 1.5V voltage supply ?

Thanks in advance,

Gaëtan Andrieu.

  • 0
    TI__Genius 12995 points

    Hello Gaetan,

    I'm glad to see your interest in the RF430FRL152.

    I'm not sure if I get the point of your issue.

    If your question is a EVM related, then the board can be supplied by a 1.5V battery. Please make sure to set the jumper "SV7" is set.

    The required hardware configuration is described in chapter 2.3 of the "RF430FRL152HEVM User's Guide (Rev. C)".

    Anyway applying a voltage supply of 1.5V on RST/NMI is not the right way of powering the IC.

    Antenna power or VDDB (1.5V) are the main power sources.

    Best regards,

    Andreas.