CC-DEVPACK-DEBUG: connecting external analog sensor

Freyja Ivorie Miguel

Part Number: CC-DEVPACK-DEBUG
Other Parts Discussed in Thread: CC2650

Hi!

I'd like to connect an external analog sensor to a CC2650 sensortag and saw that I could do this via the DevPack. The sensor requires a 3.3V-5V power supply and the signal port connected to DIO23. From the datasheet I saw that DIO23 is DP2.

I soldered wires connecting the sensor to the DevPack:

+ --> DP_VDD
- --> GND
Signal --> DP2

When I powered the DevPack via a USB cable, the sensor doesn't power up.

How am I supposed to properly connect the sensor to use the ADC connected to DIO23?

Also am I supposed to connect something else as a voltage reference for the ADC?

Thanks!

over 7 years ago

0 YiKai Chen over 7 years ago

Guru 735695 points

I think the problem is on "+ --> DP_VDD". I suggest you to give power to your sensor by other power source.

0 TER over 7 years ago in reply to YiKai Chen

TI__Guru**** 317180 points

The schematic for the DevPack could be found here:
www.ti.com/.../swrr136.pdf

From this you can see where you can get power to the sensor from. It looks like you should use XDSET_VCC

0 Freyja Ivorie Miguel over 7 years ago in reply to TER

Prodigy 20 points

I got to power it from the pin labelled VDD (3.3V).
The thing with the schematic diagram is that the labels don't match what's printed on the board :<
When I posted this I didn't have a multimeter with me to check the voltages so I just guessed where to connect it haha. But it's working now :D
Thanks!

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CC-DEVPACK-DEBUG: connecting external analog sensor