AN725 データシートの表示（PDF） - Silicon Laboratories

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AN725

ADVANCED LOW POWER TECHNIQUES FOR SiM3L1XX DEVICES

Silicon Laboratories 

AN725

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.

2

USB Debug

Adapter

1

9

3

4

5

+000.0075 µADC

2.8

V

7

6

Figure 6. SiM3L1xx MCU Card Power Measurement Configuration—Varying VBAT

Rev. 0.1

11

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