The nPM1300 Power Management Integrated Circuit (PMIC) requires a startup VSET condition for the BUCK regulators.
Use jumpers on P13 and P14 to connect VSET1 and VSET2 to the fixed resistors RSET1 and RSET2, or to GND.
Figure 1. VSET schematic drawing
| Configuration | Pin header | Jumper connection | Buck output voltage (VOUT) | |
|---|---|---|---|---|
| BUCK1 | P13 | VSET1 | RSET1 | 1.8 V |
| GND | 0 V (OFF) | |||
| BUCK2 | P14 | VSET2 | RSET2 | 3.0 V |
| GND | 0 V (OFF) | |||
An external VSET pulldown resistor can also be connected to VSET1 and VSET2 on pin header P10. In this case, disconnect the jumpers on P13 and P14. Resistor values are given in Output voltage of VOUT1 and VOUT2.
RSET1 is 47 kΩ and sets BUCK1 to 1.8 V. RSET2 is 100 kΩ and sets BUCK2 to 3.0 V.
The VSET configuration is printed on the back side of the Evaluation Kit (EK).
Note: To avoid issues with floating pins ensure that the VSET pins have the
correct configuration.