Timeline for I2C Pulldown Resistor
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
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| Oct 31, 2018 at 12:50 | comment | added | Chris Stratton | To understand the actual problem here, you need to do things like verify that it is not an address conflict (or main loop timing one or software bug), and look at the actual waveform with a scope. Removing pullup resistors is fairly simple. Overall this sounds more like an off-topic question on the usage of devices with unknown internal details, rather than an on-topic question about designing something yourself. | |
| Oct 31, 2018 at 12:37 | history | edited | Max | CC BY-SA 4.0 |
added 405 characters in body
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| Oct 31, 2018 at 12:29 | comment | added | Max | It is a quadcopter with iNav there is a set of i2c board and I am adding GPS with magnetometer when I add Magnetometer then baro stops working. | |
| Oct 30, 2018 at 23:46 | comment | added | Janka | Usually, this problem arises if you have pullups to e.g. +5V on one end and pullups to e.g. +3.3V on another. This cannot work. You need to split the bus into several voltage domains through bidirectional level translators. | |
| Oct 30, 2018 at 23:19 | comment | added | SamGibson♦ | Max - "I cann't remove pullups" Why not? What parts of the system can be changed? Can you describe the overall system design, to give readers a better chance to find more creative solutions? | |
| Oct 30, 2018 at 23:17 | answer | added | Edgar Brown | timeline score: 2 | |
| Oct 30, 2018 at 23:03 | comment | added | Dave Tweed | If you can't remove the pullups (bad design), then there's going to be a limit on the number of devices that you can't exceed. At some point, no single device can pull down against all of the combined pullups. | |
| Oct 30, 2018 at 22:53 | comment | added | The Photon | How many loads are on the bus? Have you verified you are in spec for bus capacitance? | |
| Oct 30, 2018 at 22:48 | comment | added | user16222 | this will just create a voltage divider | |
| Oct 30, 2018 at 22:33 | history | asked | Max | CC BY-SA 4.0 |