User's Manual
2.1.5 PowerConnections
Theboardcanbepoweredbyusingtheon‐boardmicroUSBconnector.Anon‐boardDC‐DCconverter
provides3.3VfortheCC3220MODASFandtherestoftheboartooperate.Thissupplycanbeisolated
fromtheDC‐DCusingthejumpersontheboard.
Table2‐4liststhepowerjumpersettings.
Reference
Usage
Comments
J18
Current
measuremen
t
Measures the current flowing into the CC3220MODASX device. This also includes the
serial flash and any stacked boosterpack.
J16
Board power
Short: Supply the board power from the on-board DC-DC converter. The board power
includes the sensors, LED and the OPAMP used for driving the ADC input.
J9 OPAMP EN If un-installed, it cuts off the power supply to the OPAMP. This can be used to enable
low power measurements.
J23,J24,J25 LED EN Un un-installed, the LEDs connected to the GPIO would be disabled. This can be used
to enable low power measurements.
J17 VSENSE This is used to power the level shifters located on the Emulator side of the board. The
level shifters can be powered by shorting this jumper. Removing this jumper enables
low current measurement.
J19
5 V power
5 V output from the USB VBUS (has a diode drop of up to 0.4 V)
J21
3.3 V power input
Can be used to power the board from an external 2XAA battery pack. It has in-
built reverse voltage protection to prevent the battery from being plugged in the
Table2‐4:PowerJumperSettings
2.1.6 UARTSignals
TheboardsupportsaUSB‐basedvirtualCOMport,usingtheTivaMCU.TheLauchPadisshipped with
theUARTlinesfromtheCC3220MODASFconnectedtotheUARTontheTivaMCU(SeeFigure2‐6).The
CC3220MODASFUARTcanalso
beroutedtothe20‐pinconnectorforuseasaGPIOoranexternalUART
(SeeFigure2‐7).The selectionisperfor medusingjumpersontheboard.
Figure2‐6:UARTRoutedontheUSBCOMPORT