[2024-feb-29] Sad news: Eric Layton aka Nocturnal Slacker aka vtel57 passed away on Feb 26th, shortly after hospitalization. He was one of our Wiki's most prominent admins. He will be missed.
Welcome to the Slackware Documentation Project
Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revision | Next revisionBoth sides next revision |
| howtos:hardware:arm:interfacing_i2c_devices [2023/05/28 13:14 (UTC)] – [Preface] louigi600 | howtos:hardware:arm:interfacing_i2c_devices [2023/05/28 13:16 (UTC)] – [Voltage Level Shifting] louigi600 |
|---|
| This is how I connected my 5v IMU pcb to a 3.3v I2C bus on my RaspberryPI: I took as educated guess that 4.4v (5v with a 4148 diode in series) would still be a tolerable power supply voltage for the whole IMU pcb, this would most likely allow all the I2C devices on the IMU pcb to recognize a minimum of 3.08v (4.4 * 0.7) as the lowest reliable logic level 1 tension allowing it to inter-operate with the PI's 3.3v logic levels. I was not able to find if the PI has internal pullups on the I2C bus or if they have to be externally placed so in doubt I put in 10k pullups between the 4.4v power line and the 2 data lines. I was the able to correctly detect the sensors on the IMU pcb. | This is how I connected my 5v IMU pcb to a 3.3v I2C bus on my RaspberryPI: I took as educated guess that 4.4v (5v with a 4148 diode in series) would still be a tolerable power supply voltage for the whole IMU pcb, this would most likely allow all the I2C devices on the IMU pcb to recognize a minimum of 3.08v (4.4 * 0.7) as the lowest reliable logic level 1 tension allowing it to inter-operate with the PI's 3.3v logic levels. I was not able to find if the PI has internal pullups on the I2C bus or if they have to be externally placed so in doubt I put in 10k pullups between the 4.4v power line and the 2 data lines. I was the able to correctly detect the sensors on the IMU pcb. |
| |
| | |
| | ====== Hacking I2C in DIMM modules ====== |
| | A |
| ====== Sources ====== | ====== Sources ====== |
| <!-- If you are copying information from another source, then specify that source --> | <!-- If you are copying information from another source, then specify that source --> |
