4.1 Measuring the CC3235MOD Current Draw
To measure the current draw of the CC3235MOD device using a multimeter, use the VBAT jumper on the J101
isolation block. The current draw measured in this mode includes only the CC3235MOD device, the serial flash
internal to the module, and any current drawn through the BoosterPack plug-in module headers. Furthermore,
if the module's GPIO is driving a high current load such as an LED, then this will also be included in the
measurement.
4.1.1 Low-Current Measurement with USB Power (<1 mA)
See the following instructions to measure ultra-low power when powering with a USB cable.
1. Remove the VBAT jumper in the J101 isolation block, and attach an ammeter across this jumper. See
.
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.
3. Begin target execution and set the device to low-power modes (LPDS or hibernate).
4. 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
CC3235x SimpleLink™ Wi-Fi® Internet-on-a chip™ Networking Subsystem Power Management
current consumption measurement techniques.
Figure 4-2. Low Current Measurement
Operational Setup and Testing
42
CC3235MODSF SimpleLink™ Wi-Fi
®
and IoT Solution With MCU
LaunchPad™ Hardware
SWRU548C – FEBRUARY 2019 – REVISED SEPTEMBER 2021
Copyright © 2021 Texas Instruments Incorporated
Summary of Contents for CC3235MODASF
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