UM-B-114
DA14531 Development Kit Pro Hardware User Manual
User Manual
Revision 1.4
23-Apr-2020
79 of 82
© 2021 Dialog Semiconductor
Appendix G Operating the DK PRO at 1.5V (boost mode)
Jumpers J4 and J5 on the PRO Development Kit allow the DA14531 to be operated in buck, boost
and bypass mode at 1.1V, 1.8V, 3.0V or 3.3V (Figure 75).
In order to operate in boost mode with a different voltage, except of 1.1V, additional components or
equipment must be used. Instructions on how to configure a voltage of 1.5V, while maintaining power
profiler and current measurement functionality over the PRO Development Kit, are presented in the
following sections.
G.1
Adding external resistor to VLDO Selection (J5) pin header
1. Remove the jumpers from J5
2. Connect a 31.6K Ohm 1% resistor (which is an E96 standard value) between pins 1 and 4.
3. Verify that jumper on J4 is on position 1:2
Figure 75: Configuring VLDO for 1.5V boost operation
G.2
Using external power supply
1. Remove jumper J9:1-2
2. Connect V+ (1.5V) of external supply on pin 1 and GND to an available GND point on a
breakout header
3. Verify that jumper on J4 is on position 1:2
Figure 76: Using external power supply for 1.5V boost operation
G.3
Important Notice For Boost Operation
For a guaranteed startup, the load on VBAT_HIGH must not exceed 50 μA during system
startup/wake-up.
