Contents
Revision history.................................. iv
Environmental and safety notices.......................... v
1Introduction................................... 7
2Minimum requirements............................ 9
3Kit content................................... 10
4Hardware description............................. 11
4.1 Block diagram ................................. 12
4.2 Power supply ..................................13
4.3 Battery temperature monitoring .......................... 15
4.4 Output connections ............................... 15
4.5 I/O pins .................................... 16
4.5.1 LEDs ....................................17
4.5.2 GPIOs ................................... 17
4.5.3 TWI .................................... 18
4.5.4 VSET ................................... 18
4.5.5 SHPHLD .................................. 19
4.5.6 VDDIO ................................... 19
4.5.7 Load switches/LDOs ............................. 20
4.6 Software control ................................ 20
4.6.1 nPM Controller ............................... 20
4.6.2 Software library and sample ..........................21
4.7 Jumpers .................................... 21
4.7.1 VBAT jumper ................................ 21
4.7.2 NTC jumper ................................ 22
4.7.3 Buck startup configuration .......................... 22
4.7.4 VDDIO reference voltage ........................... 23
4.7.5 Load switch configuration ........................... 23
4.7.6 LDO bypass capacitors ............................ 24
4.7.7 LED jumper connections ........................... 24
4.8 Buttons .................................... 25
4.9 nPM Fuel Gauge Board ............................. 25
5Measure current................................ 27
5.1 Use an oscilloscope for current measurements .................... 28
5.1.1 Prepare for VBAT current measurements .................... 28
5.1.2 Prepare for VBUS and VOUT current measurements ................ 28
5.1.3 Measure VBAT, VBUS, and VOUT using an oscilloscope ............... 28
5.2 Use an ampere meter for current measurements ................... 29
5.2.1 Prepare for VBAT, VBUS, and VOUT current measurements ............. 29
5.2.2 Measure VBAT, VBUS, and VOUT using an ampere meter .............. 30
5.3 Use a Power Profiler Kit II for current measurements ................. 31
5.3.1 Measure VBAT current ............................ 31
5.3.2 Measure VBUS current ............................ 32
5.3.3 Measure VOUT1 or VOUT2 current ....................... 33
4490_387 ii
