The nPM1100 EK supports the monitoring of current flowing into the Power Management Integrated Circuit (PMIC), to and from the battery, and into the external application .
Note: The battery charger includes automatic trickle charge control which introduces restrictions on what current measurement instruments can be used with VBAT.
Current can be measured using various test instruments. Some examples of test equipment are the following:
- Power analyzer, uni/bidirectional capability
- Oscilloscope, bidirectional capability
- Ampere meter, bidirectional capability
- Power Profiler Kit II (PPK2), unidirectional capability
The nPM1100 PMIC primary power supply is from VBUS. The secondary power supply as well as charger output is VBAT.
The nPM1100 PMIC primary output is VOUTB.
| Component | VBUS | VBAT | VOUTB |
|---|---|---|---|
| Measurement connector | P8, pin 1 | P4, pins 1 and 2 | P4, pin 3 |
| Solder bridge | SB3 | SB4 | |
| Series resistor | R1 | R20 | |
| Series resistor range | <100 mΩ | <100 mΩ | |
| Directionality | Unidirectional | Bidirectional | Unidirectional |
For more information on current measurement, see the tutorial Current measurement guide: Introduction.