Xenon dead - nothing - no power


#1

Hey everyone,

HELP!.. I’m playing around with trying to get two I2C sensors found using an I2C scanner and was having no joy… then all of a sudden my Xenon ‘died’. No LED, no power through my USB meter, nothing. The CHG orange LED does flash when I plug in a USB lead but nothing happens…

What exactly i was doing was i had a temperature sensor on SDA/SCL, address found by I2C scanner. It published fine, all was well there.
Then I added a Temperature and Humidity sensor to D2/D3, which wasn’t found by t he scan.
The Temperature and Humidity sensor was found on SDA/SCL.
No combination of both was found, only what was on SDA/SCL.
Then it just died.

Any ideas?

Thanks…
RK


#2

Check the voltage on the 3.3 pin. If it’s OK check the level on the RST pin. Should be 3v3 in “normal” operation.


#3

What sensors and how were they wired?
If the boards happen to have pull-ups to 5V that would at least pose the risk of damaging the I2C interface on the Xenon since that is only 3.3V tolerant.


#4

Hey - thanks for the replies…

I have 3.3V at 3V3 and and RST.
The sensors are an ADT7420 with 4k7s to 3.3V and a Sensirion STS21 also with 4k7 pull-ups to 3.3V…


#5

Also Windows doesn’t recognise it in the Device Manager - it doesn’t refresh even when its plugged in or out.