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AN725

ADVANCED LOW POWER TECHNIQUES FOR SiM3L1XX DEVICES

Silicon Laboratories 

AN725

5.2. Measuring Power

This section discusses the hardware setup and code required to reproduce the power specifications reported by

the SiM3L1xx data sheet.

5.2.1. Hardware Setup

To measure the power on the SiM3L1xx MCU Card with a fixed 3.3 V 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 and put a multimeter across (positive side on the bottom pin).

4. Move the VBAT Sel switch (SW2) to the middle +3.3 V_VREG position.

5. Move the VIO Sel (SW8) and VIORF Sel (SW9) switches to the bottom VBAT position.

6. Connect the 9 V power adapter to POWER (J6).

7. Download the code to the board.

8. Remove the debug adapter connection.

9. Measure the power of the device.

2

6

9 V Power

Adapter

USB Debug

Adapter

1

3

4

5

Figure 5. SiM3L1xx MCU Card Power Measurement Configuration—Fixed VBAT

10

Rev. 0.1

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