P3S0200GMX I2C low power

[Franz75]

Good morning,
designing a battery powered device on the same I2c I have both the dispay and the RFID tag reader. I would like to turn off the i2c display and leave the RFID tag reader on.
I would like to use the P3S0200GMX device, but I have some questions:
1) I could switch off both the P3S0200GMX and the associated peripheral given that I_off in power-off with VCC=0 I have a
leakage current of 0.01uA x pin?
2) Keep the P3S0200GMX always on and when I turn off the associated peripheral drive only the OE pin?
3) What does the ICC supply current and ΔICC additional supply value represent
curren?

Thanks in advance
Francesco

[TomasVaverka]

Hello Franz,

Based on your description, I would say you do not need the I3C switch, but a load switch located between your power supply and the I2C display. Load switches usually have a variety of built-in protection functions and are expected to improve the reliability of the system.

NXP does offer load switches mainly for USB PD and Type-C applications, but there are other manufacturers offering universal load switches suitable for applications like yours.

BR, Tomas

[Franz75]

Hello Tomas,

thank you for taking your time, but maybe I didn't explain myself very well.
I already use a switch on the power supply to turn off the display, but I would  disconnect the I2c bus, otherwise the pull-up resistors feed the display a little.I want to disconnect everything because I power the device on battery.

Thanks in advance

Francesco.

[TomasVaverka · Accepted solution]

Hello Francesco,

OK, thanks for sharing more details about your concept. Please see below the answers to your original questions.

1. Yes, 0.01uA per pin at room temperature.

2. The switches will be off when nOE = H.

3. ICC is the supply current when either S or nOE is around 0.7 to 0.8 * 3.3V. The DeltaICC is the extra current if either S or nOE is at 1.8V.

BR, Tomas