MCP23017 chip becomes very hot, used with a raspberry pi

[sky99]

Hello!
I got a MCP23017 chip to work with one of my raspberries. I can blink a LED and control it.
However, i am a little concerned by the temperature of the chip, it is burning hot, and i measured
at least 75°C with a TMP36 and a MCP3008 DAC on the same raspberry pi.
Is it normal? the chip has been running at this high temperature for at least 10 hours.

What do you think?

[adafruit_support_bill]

That does sound warmer than normal. Are you using a current limiting resistor on your LED?

[sky99]

Hi,
I have a resistor, and i also removed the LED (so the circuit for the LED is opened, and nothing is plugged in),
but the chip is still very hot.

[adafruit_support_bill]

It should not be hot at all with no load. What do you have connected besides VDD & VSS?

[sky99]

My wiring is :

• VDD to +3.3v
• VSS to ground
• SCL to pi cobler SCL
• SDA to pi cobler SDA
• A0 to ground
• A1 to ground
• A2 to ground
• RESET to +3.3v

Right now, i have a LCD connected, but i did try with nothing connected beside the pins in the list (no load), and the chip temperature did not get any lower.

[adafruit_support_rick]

Can you post a picture of your wiring and assembly?