Onboard Ldo Power; Measuring The Cc3120Mod Current Draw; Low-Current Measurements (Hibernate And Lpds) - Texas Instruments SimpleLink BoosterPack BOOSTXL-CC3120MOD Manual

7.1.2 Onboard LDO Power
On some LaunchPad kits, the 3.3 V is not capable of sourcing the 350‐mA peak current required for the
BOOSTXL‐CC3120MOD module. If the 350‐mA peak current cannot be sourced, the onboard 3.3‐V LDO
can be used (see Figure 7‐3). This LDO must be sourced from the USB connector on the BOOSTXL‐
CC3120MOD and the LaunchPad kit in a shared‐load manner.
7.2 Measuring the CC3120MOD Current Draw
7.2.1 Low‐Current Measurements (Hibernate and LPDS)
To measure the current draw of the CC3120RM and the serial flash, a jumper is provided on the board
labeled J6. By removing this jumper, one can place an ammeter into this path and the current can be
observed. This method is recommended for measuring LPDS and hibernate currents that are of the
order of few 10s of micro amps.
The jumper is removed and an ammeter is added in series to measure the hibernate and LPDS currents
(see Figure 7‐4).
Figure 7‐3: 3‐3‐V Power From LDO