User's Guide

xE922-3GR Hardware User Guide
1VV0301272 Rev.0.8 2017-01-05
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Reserved. Page 77 of 112
signal name
module
trace length
[mm]
Number of microvias on
the module
SD_CLK
37.86
4
SD_CMD
37.26
4
SD_DAT0
37.79
4
SD_DAT1
36.54
4
SD_DAT2
35.72
4
SD_DAT3
36.49
4
12.4. ADC
xE922-3GR offers in total three ADC input lines:
PAD
Signal
I/O
descriptions Type
AM19
ADC_VBATMEAS
I
Battery measurement ADC
Analog
AL18
ADC_IN0
AI
Analog to Digital converter 1 (Batt ID)
Analog
AK19
ADC_IN1
AI
Analog to Digital converter 2 (Batt Temp)
Analog
When the system implements an external battery charger IC circuitry, the above pin description explains the
reserved usage in that case. When no charger IC is implemented, ADC_IN0 and _IN1 can be used for general
purpose ADC input.
ADC_VBATMEAS still needs to be applied at the main supply pin V_BAT of the module in order to properly
boot the system.
ADC_INx properties:
· resolution : 12 bit
· input voltage range : 0V … 1.2V (for ADC_IN0/1)
· input resistance: minimum 1 MOhm