Hardware Description
Figure 8. Feed USB on the BoosterPack (always while using the on-board LDO)
2.5
Measure the CC3100 Current Drawn
2.5.1
Low Current Measurement (Hibernate and LPDS)
To measure the current drawn from the CC3100 device, a jumper is provided on the board labeled J6. By
removing this jumper, the user can place an ammeter into this path and observe the current. This method
is recommended for measuring LPDS and hibernate currents that are just a 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 9. Low Current Measurement
NOTE:
If the device uses service pack 1.1.0 or higher, the R113 resistor must be removed to get
lower LPDS currents. This resistor can leak an extra 33 uA from the 3.3-V supply in LPDS
mode, if the SPI is used as the host interface.
2.5.2
Active Current Measurement
To measure active current in a profile form, use a 0.1-
Ω
1% resistor on the board and measure the
differential voltage across it. This can be done using a voltmeter or an oscilloscope for measuring the
current profile.
11
SWRU396A – December 2014 – Revised September 2015
CC3100MOD SimpleLink™ Wi-Fi® Network Processor Module BoosterPack
Hardware
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