C 8 0 5 1 F 9 7 0 D K - U G
14
Rev. 0.1
6. Power Measurement
The C8051F970 MCU card includes a power measurement header JP3 for MCU power measurement purposes.
The VDD_MCU supply on top of the header connects only to the MCU on the board. The VDD supply on the
bottom of the JP3 header powers the external LEDs, switches, reset switch, potentiometer, and VCP COM port.
6.1. Measuring Power with Fixed VDD
To measure the power of the C8051F970 MCU using the target board at a fixed 3.3 V or 1.8 V:
1. Connect a USB Debug Adapter to the 10-pin shrouded debug connector (H8).
2. Remove the shorting blocks from the COM port pins (JP1 and JP2) and the potentiometer (JP5).
3. Remove the JP3 power measurement shorting block.
4. Connect a multimeter across (positive side on the bottom pin) the JP3 header.
5. Move the J1 shorting block to either the
+3.3V
–
VREG
or the
VREG
–
+1.8V
position.
6. Move the
VDD Select
switch (SW1) to the upper
VREG
position.
7. Connect the 9 V power adapter to
POWER
(P1).
8. Download the code to the board.
9. Measure the power of the device.
Figure 7. C8051F970 Power Measurement Configuration— Fixed VDD
Not
Recommended
for
New
Designs
