The nPM1300 Evaluation Kit (EK) can be set up to monitor current flowing into the nPM1300 Power Management Integrated Circuit (PMIC), to and from the battery, and into the external application.
For higher precision results we recommend the use of an SMU on both input and output parameters. The PPK2 is an affordable alternative to an SMU because it captures traces of both voltage and current changes. When using a PPK2 there is no need to connect an external resistor on the EK. Some attention to the EK is needed to measure current on an output using a series resistor.
For measurement instructions, see sections Use an oscilloscope for current measurements, Use an ampere meter for current measurements, and Use a Power Profiler Kit II for current measurements.
The main power supply for the nPM1300 PMIC is VBUS. The complementary power supply, as well as charger output, is VBAT. The PMIC regulated outputs are VOUT1 and VOUT2. The unregulated outputs are VBUSOUT and VSYS.
| Component | VBUS | VBAT | VOUT1 | VOUT2 |
|---|---|---|---|---|
| Measurement connector | P2, pin 1 | P1, pin 1 and pin 2 | P4, pin 1 and pin 2 or VOUT1 probe loop |
P5, pin 1 and pin 2 or VOUT2 probe loop |
| Series resistor | External | R1 (IBAT) | External | External |
| Series resistor range | <100 mΩ | <100 mΩ | <100 mΩ | <100 mΩ |
| Directionality | Unidirectional | Bidirectional | Unidirectional | Unidirectional |
The nPM1300 EK has a default jumper configuration, see Jumpers. To allow the EK to work directly without changes make sure the jumpers are correct before powering up the EK. Prior to measurements, connect the EK to a DC power source (VBUS), see Power supply for details.
For more information on current measurement, see the tutorial Current measurement guide: Introduction.