Timeline for Using a voltage divider versus step-down voltage regulator for i2c pull-up
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
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| Dec 29, 2020 at 0:38 | vote | accept | bem22 | ||
| Dec 22, 2020 at 21:25 | history | edited | user57037 | CC BY-SA 4.0 |
Added a bit more information after reading comments etc.
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| Dec 22, 2020 at 19:13 | vote | accept | bem22 | ||
| Dec 29, 2020 at 0:35 | |||||
| Dec 22, 2020 at 19:09 | comment | added | bem22 | Thanks mkeith. Really good tip. I will use the 3v3 from the pi! | |
| Dec 22, 2020 at 18:24 | comment | added | user57037 | If power is not a concern I would use a divider. But my first choice would be to find where on the Raspberry Pi board the 3.3V is coming from and pull up to that 3.3V. That way you don't need a regulator OR a divider. If the Raspberry Pi I2C runs at 3.3V, there must be 3.3V available on the Raspberry Pi board somewhere. | |
| Dec 22, 2020 at 15:02 | comment | added | bem22 | I updated my question. Your answer is still relevant. I now understand that there is no difference between SDA_1 and SDA_2. I was wondering whether there's any problem in using the divider instead of step-down regulator. From a design point of view, 4 resistors to split the voltage across two lines is simpler and cheaper than employing a regulator. What do you think? Btw, this is not going to run on a battery, but on a 40W transformer, so there's enough power. | |
| Dec 22, 2020 at 2:07 | history | answered | user57037 | CC BY-SA 4.0 |