What is xbee s2c 802.15.4 ADC range

[bastien]

Hi

I have xbees s2c 802.15.4 (XB24CAPIT-001)
I have now issues reading ADC, and I suspect that the range I assumed (0 to 3.3V) is actually less (1.2V ?)
I have been looking at the doc and I have found:

• The user manual that says nothing but “Vref Feature not supported on this device”
  There is nothing I found about the ADC range in that doc… unfortunately
• questions on this very forum such as : https://forums.digi.com/4660/what-is-the-maximum-analog-input-voltage
  which is not clear for me, because I do not get the logic of xbee modules naming. Is the s2c a serie 1, 2 3 ? Is zigbee or ZB equivalent to a serie in particular ?
• https://www.digi.com/resources/documentation/Digidocs/90002002/Reference/r_zb_i_o_sampling.htm
  Which clearly says : “0x0000 represents 0 V, and 0x3FF = 1.2 V”
  But then again, does “XBee/XBee-PRO Zigbee RF Modules” apply to xbee s2c 802.15.4 (XB24CAPIT-001) ?
• https://www.digi.com/support/knowledge-base/digital-and-analog-sampling-using-xbee-radios
  Which states that 802.15.4 can use Vref (thought there’s a “*” which I don’t find what it refers to), and that ZigBee only has 1.2V Vref fixed. Again I found the module naming confusing
• https://www.digi.com/resources/documentation/Digidocs/90000982/reference/r_specs_ele_char_802.htm?TocPath=Specifications|_____1
  Which refers to XBee/XBee-PRO XBee/XBee-PRO S1 802.15.4 (Legacy) RF Module. What is legacy ? What is not ?
• https://www.digi.com/blog/post/xbee-buying-guide
  Which did not make it more clear. Then again how do I map serial number and serie ?

Could it be possible to get :

• a clear chart on what serial number is what module type ? Along with all nicknames, that are found across doc + forum, such as legacy, serie X, ZB, etc ?
• a clear chart on what module type support Vref, and if not what is the ADC range ?

Thanks in advance for the answer
I wish this would have been clearly written in the user manual, as it would have save manual rework on the prototype and need for a new PCB version
If Digi people stumble upon that post, could that info be added to the next version of the manual ?

[plater]

Page 183 of the datasheet has a mapping:
https://www.digi.com/resources/documentation/digidocs/pdfs/90001500.pdf

Model: S2CTH (XBee S2C through-hole)
IFETEL (IFT) number RCPDIS219-1821-A1 applies to these S2C radios:
XB24CAPIT-001,

The max range is listed as 1.2v, I suspect the vREF pin on other models lets you supply your own voltage value, but that model is locked to 1.2v

The (Legacy) models were from a design by maxstream before they were bought by digi.
I don’t know how they relate to the S2C models. We skipped from the legacy up to the xb3 version.
If I am not mistaken the Legacy parts are S1(series1) and yours are S2(series2), and the newer XB3s are the S3(series3)?

[bastien]

Thanks for the answer
The model mapping is indeed at the end of the manual

But what about the ADC max range being 1.2V ? Where did you find that ?
The only time I found 1.2V was about ZigBee units. Is ZigBee an alias of XB24CAPIT-001 ? Or of S2C ?

[plater]

The datasheet i linked is for the XBee/XBee-PRO S2C 802.15.4
Page 70 “Analog input” says max adc value is 1.2v

It would be nice if there was a modules section giving the electrical characteristics (like drive strength for pins) and etc, but it seems to be buried.

[bastien]

haaaa… It was there !
Thanks

About drive strength and such, what about “GPIO specifications” page 31 ?

[plater]

I knew it was in there somewhere hah