SWRU548C February 2019 – September 2021 CC3235MODAS , CC3235MODASF , CC3235MODS , CC3235MODSF
Headers J19 and J20 are present on the board to supply external power directly when USB power is not available. Use the following precautions before using the board with an external power supply.
The OPAMP EN and LED EN jumpers are also available to remove any current draw from the onboard OpAmp and LEDs being driven by the GPIOs, see Table 2-2.
Reference | Use | Comments |
---|---|---|
J19 | 5-V power input | Used to power the board from an external 5-V supply |
J20 | 3.3-V power input | Used to power the board from an external 3.3-V supply. |
J21 | OPAMP EN | If uninstalled, the power supply to the operational amplifier is cut off. This can be used to enable low-power measurements. |
J26 | LED EN | If uninstalled, the LEDs connected to the GPIO are disabled; this can be used to enable low-power measurements. |