MCP9601 cannot use 0x60 I2C address

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rhchiu
 
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MCP9601 cannot use 0x60 I2C address

Post by rhchiu »

According to the MCP960x datasheet, figure 6-4, to get 0x60 I2C address, connect the ADDR pin directly to GND. When I connect ADDR to the ground, my Arduino 33 IoT cannot find the device. I can get the other 7 I2C addresses by using different resisters to connect ADDR and GROUND. I like to connect 8 thermocouples to a single Arduino device. Please help. Thanks Richard

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adafruit_support_carter
 
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Re: MCP9601 cannot use 0x60 I2C address

Post by adafruit_support_carter »

What addresses show up in an I2C scan without the MCP9601 attached?
https://learn.adafruit.com/scanning-i2c ... ng-testbed

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rhchiu
 
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Re: MCP9601 cannot use 0x60 I2C address

Post by rhchiu »

That scanner worked as promised. Thank you. But it find two extra I2C devices. Those two I2C device's addresses are 0x60 and 0x6A. Even when I disconnect all MCP9601 from the I2C bus, the scanner still found two devices. Looks like this extra device at 0x60 is preventing MCP9601 from using 0x60 as I2C address. I wonder if this is Arduino 33 Iots problem. Anyone have similar problem ??

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rhchiu
 
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Re: MCP9601 cannot use 0x60 I2C address

Post by rhchiu »

I found the answer in the Arduino Forum.
https://forum.arduino.cc/t/tca9548a-fin ... 1041639/10
0x60 and 0x6A are used by Arduino 33 IOT.

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Franklin97355
 
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Re: MCP9601 cannot use 0x60 I2C address

Post by Franklin97355 »

Thank you for posting your discovery. It will help someone.

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