PSoC® 4100S Pioneer Kit Guide, Doc. # 002-14067 Rev. *C
41
Figure A-7. Potentiometer Schematics
Note that there is a current leakage of 80 µA on the VTARG node into the PSoC 5LP when using
battery (VBAT) as the power supply. Remove resistor R20 to avoid leakage and get accurate current
measurement values. You will not be able to program the PSoC 4100S while you have removed the
resistor. After the measurment is done, populate resistor R20 back to enable programming of the
PSoC 4100S.
After measuring the current consumption, move switch P5 of SW7 to ON position for normal opera-
tion of the kit. See
Figure A-5 on page 40
for other switch combinations of SW7.
■
Measurement using ammeter when powered from an external power supply
When the PSoC 4100S Pioneer Kit is powered from an external power supply, remove the USB
cable from J6. Connect the positive terminal of the external power supply to the positive terminal of
the ammeter and the negative terminal of the ammeter to the P4.VDD test point. Connect the nega-
tive terminal of the external power supply to any GND pin on the board.
Figure A-8
shows the
required connections.
Figure A-8. Current Measurement when Powered Externally
A.2.8
Expansion Connectors
A.2.8.1
Arduino-compatible Headers (J1, J2, J3, J4, and J12)
This kit has five Arduino-compatible headers: J1, J2, J3, J4, and J12. You can develop applications
based on the Arduino shield hardware.
The J1 header contains I/O pins for reset, internal reference voltage (IOREF), and power supply
lines. The J2 header is an analog port that contains I/O pins for the SAR ADC. The J3 header is pri-
Potentiometer
Remove R118, while performing
low power measurement.
NO LOAD
P4_VDD
P2_4
J2_P2_4
R125
ZERO
R2
10K
3
1
2
C79
1 nF
R118
ZERO
R133
ZERO
VOLTAGE SOURCE
-
+
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