Why do you want to know that.Seems a 3.3volt/150mA (max 6volt in) linear regulator, commonly used on modules like that.What would worry me more is that that 3.3volt logic module doesn't have IO level translators.So you can't connect it directly to a 5volt Arduino.Leo..
This module is working perfectly with an UNO board using its 3v3 line!My next step is to power it up directly from an li-ion battery which when it is fully charged I get 4.2VExcept this 3.3V pin there is also a VIN pin and by reading the datasheet I can decide if that 4.2 voltage is within boundaries.
The marking will normally listed in the datasheet for the device. Some manufacturers have SMD code lookup tables for their own devices, but I have not come across a look up table that covers all manufacturers.
As long as this is the ONLY module on the I2C bus, and you do not have the internal pull-up enabled on the I2C pins, nor any other pull-up to 5V, there should be no problem, as the I2C bus is open collector.It's not good practice, nonetheless. You better add a level shifter (or use a 3.3V Arduino).Those sensors normally work quite well at voltages below 3.3V, that's why you can connect them to 3.3V and all still works fine.
Voltage regulator required, of course. 4.2V > 3.6V. That's why.
This is not a typical ST nor a Motorola. What else can it be?
I meant a voltage regulator before ATmega328, I don't have any intention removing LSM module's regulator. What I want is to read its datasheet