This is what I'm trying to do:
I have an MSP430G2553 chip and I'd like to write an ADC program to translate some input from an arduino sensor (I have a few analog sensors that use 5.5v - some work between 3.3 and 5.5 volts).
I realized that my MSP430 can not connect directly to these 5.5v sensors so I decided to get the PCA9306DCTR voltage leveler from TI to bridge the gap.
I'm not sure I understand how these voltage levelers work and if I'm thinking about this connection correctly.
Considering the fact that the voltage on my MCU pin (say A0 - pin 2) is ~1.4v and the needed voltage into my sensor (say the: ultrasonic distance sensor) is ~5v, I connected the VREF1 pin on thePCA9306
to an external 3.3V supply coming from 2 AA batteries and the GND pin to the DVSS of the MCU (attempting to create a common-ground). In my mind the PCA9306 does not need a 5.5V supplier for the sensor.
Do both VREF pins (both sides) have to be provided? Can I just add the ~1.2 - 1.4V from the MCU into VREF1 and expect ~5V coming out of the PCA9306?
Since most application designs include one single voltage power-source (be it 3.3V or 5V, etc.) can I assume that the voltage-leveler will raise the voltage from 1.4V to 5V without an external 5V power-source?
How are the serial-clock and serial-data ports used in my case? After connecting the GND and VREF1 to 3.3V, do I connect my A0 (MCU pin 2) into the SDA1 and the ultrasonic sensor into the SDA2 of the voltage-leveler?
Am I going about this the right way? If not, what am I missing?