24lc32a i2c issues | adafruit | Page 1

deft scarab Mar 16, 2022, 10:24 PM

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Hi all, first time here, please be gentle... 🙂
Trying to interface a bare DIL 24lc32a with a Trinket M0. i2c.scan() only picks it up every now and then:
I2C addresses found: [] I2C addresses found: [] I2C addresses found: [] I2C addresses found: [] I2C addresses found: [] I2C addresses found: [] I2C addresses found: ['0x50'] I2C addresses found: []

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Then, when trying to connect the driver, I get:

Traceback (most recent call last):
  File "code.py", line 49, in <module>
  File "adafruit_24lc32.py", line 240, in __init__
  File "/lib/adafruit_bus_device/i2c_device.py", line 61, in __init__
  File "/lib/adafruit_bus_device/i2c_device.py", line 183, in __probe_for_device
ValueError: No I2C device at address: 0x50

deft scarab Mar 17, 2022, 1:47 AM

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Could it be a faulty chip, wrong circuit, or...?

gray copper Mar 22, 2022, 12:02 PM

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Do you have correct pull up resistors on the SDA and SDL lines?

deft scarab Mar 22, 2022, 12:16 PM

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Yes I do. The other peripherals (ssd1306, mcp23017) on the same bus work well. Additionally, I figured out that once I connect an ssd1306 device to the bus, the 24lc32 gets picked up too. When I disconnect the clock pin of the ssd1306 the board loses the 24lc32 too. Tried with a Trinket M0 and a Feather M4 Express, same behavior.

#24lc32a i2c issues