PSoC® 6 BLE Prototyping Board Guide, Doc. # 002-24993 Rev. **
38
Appendix
A.2.6.4
CapSense Capacitors
There are footprints for three CapSense capacitors - one for self-capacitance and one for mutual
Capacitance sensing modes, but only the CMOD capacitor used for self-capacitance mode is
loaded. If CapSense is not used but P7.7 is used for a digital or analog function, C32 may need to be
removed. See the datasheet on the CapSense component for more information on how to select and
use theses capacitors (C30-CINTA, C31-CINTB, and C32-CMOD).
Note:
P7[1] is used for LED4 (green LED) by default. This must be disconnected by removing R37
before loading C30 for mutual capacitive sensing (CSX).
Figure A-13. CapSense Capacitors
A.2.6.5
System Crystals
Two different crystal oscillators inputs are available on the board. The WCO kHz crystal (32.768 kHz)
is populated and is used for BLE timing. Pads for the ECO MHz crystal and load crystals are on the
board so that you can easily select the crystal of your choice. The ECO is optional and only required
when the internal clock must be more accurate than the IMO (Internal Main Oscillator). The internal
FLL and PLL help to provide a wide range of options with either the ECO or IMO. The crystal used
for the BLE radio is pre-installed in the EZ-BLE Creator Module.
Figure A-14. System Crystals
C30
0.47nF
50V
No Load
CapSense Capacitors
CINTA
P7_1
P7_7
C32
2.2nF
50V
CMOD
P7_2
C31
0.47nF
50V
No Load
CINTB
P0_0
P0_1
WCO
KHz Crystal
P12_7
ECO
MHz Crystal
P12_6
C35
10pF
No Load
Y 2
32.768KHz
ECS-.327-12.5-34B-TR
C34
10pF
No Load
C36 18pF
50V
C37
33pF
50V
Y 1
24MHz
No Load
ECS-240-8-37CKM
1
3
2
4
