Texas Instruments SWRU294, User Manual, Page: 18 / 57

SWRU294
Page 18/40
6.3.3 External Power Supply
The SmartRF TrxEB has a connector for powering the board using an external power supply. The
power source selection jumpers should short circuit pin 5-6
(“EXT”) and 9-10 (“LCL”) of header
P16 as shown in Figure 9.
Figure 9
– P17 jumper settings to power TrxEB using external power supply
The externa
l supply’s ground should be connected to pin 2 of P201. Apply a voltage in the range
from 3.0 V to 3.3 V to pin 1 (see Figure 10)
. Pin 1 and pin 2 of P201 are marked “Vext” and
“GND”, respectively, on SmartRF TrxEB revision 1.5.0.
Figure 10
– Powering TrxEB via the external power supply connector (P201)
WARNING! When using an external power source, all onboard voltage regulators are
bypassed. There is a risk of damaging the onboard components if the applied voltage on the
external power connector/header is lower than -0.3 V or higher than 3.6 V (combined
absolute maximum ratings for onboard components. See section 5.1 for further information.
Pin 1: Vext
Pin 2: GND