AN725
Rev. 0.1
11
To measure the power on an SiM3L1xx MCU Card with a varying VBAT:
1. Connect a USB Debug Adapter to the 10-pin CoreSight connector (J14).
2. Remove the three shorting blocks from J7.
3. Remove the JP2
Imeasure
shorting block.
4. Move the
VBAT Sel
switch (SW2) to the bottom BAT position.
5. Move the
VIO Sel
(SW8) and
VIORF Sel
(SW9) switches to the bottom VBAT position.
6. (Optional) Place a battery in the BT1 holder.
7. (Optional) Instead of a battery, connect the positive terminal of a bench power supply to the positive
terminal of the multimeter, the negative terminal of the power supply to the MCU card ground, and the
negative terminal of the multimeter to the top pin of the Imeasure jumper (JP2). This configuration will
prevent any circuitry on the board from interfering with the power measurement.
8. Download the code to the board.
9. Remove the debug adapter connection.
10. Measure the power of the device.
Figure 6. SiM3L1xx MCU Card Power Measurement Configuration—Varying VBAT
+000.0075
µADC
2.8
V
USB Debug
Adapter
1
2
3
6
4
5
9
7
