Adafruit MCP4725 Breakout Board 12 Bit DAC (Constant 2.5V output)

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dlr1202
 
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Adafruit MCP4725 Breakout Board 12 Bit DAC (Constant 2.5V output)

Post by dlr1202 »

To whom it may concern,
I'm having an issue with the MCP4725 I2C module outputting a constant 2.5V when its first powered on. I noticed the output changes linearly as I turn the voltage up/down. I checked the soldering of the pins and there not an issue. The module comes with internal pull up resistors on the data lines (SDA, SCL) so that shouldn't be an issue either. I've tried 3 different modules at this point, and all have the same issue. Thoughts? Suggestions?

Thank you,
Frustrated Engineer

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adafruit_support_bill
 
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Re: Adafruit MCP4725 Breakout Board 12 Bit DAC (Constant 2.5V output)

Post by adafruit_support_bill »

I'm having an issue with the MCP4725 I2C module outputting a constant 2.5V when its first powered on.
What voltage are you powering it with?

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dlr1202
 
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Re: Adafruit MCP4725 Breakout Board 12 Bit DAC (Constant 2.5V output)

Post by dlr1202 »

Hello and thank you for responding. I'm using 5V.

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Re: Adafruit MCP4725 Breakout Board 12 Bit DAC (Constant 2.5V output)

Post by adafruit_support_bill »

With VDD = 5v, 2.5v is 1/2 of full-scale. That is the expected output at power-up using the default factory configuration for the chip. Please see section 5.4 of the datasheet:
https://cdn-shop.adafruit.com/datasheets/mcp4725.pdf

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