See the following instructions to measure ultra-low power when powering with a USB cable.
- Remove the VBAT jumper in the J101 isolation block, and attach an ammeter across this jumper. See Figure 4-2.
- Consider the effect that the backchannel UART and any circuitry attached to the CC3235MOD may have on current draw. Consider disconnecting these at the isolation jumper block, or at least consider their current sinking and sourcing capability in the final measurement.
- Begin target execution and set the device to low-power modes (LPDS or hibernate).
- Measure the current. Remember that if the current levels are fluctuating, it may be difficult to get a stable measurement. It is easier to measure quiescent states. See the "Power Measurement Guide" in CC3135, CC3235x SimpleLink™ Wi-Fi® Internet-on-a chip™ Networking Subsystem Power Management for more current consumption measurement techniques.