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nRF8002 Development Kit User Guide
Revision 1.0
4.1.4 Buzzer (PWM output) and nRF8002 current measurement
Figure 5. Buzzer connected to PWM through a jumper
nRF2748 is populated with a buzzer, shown in
Figure 5.
The PWM signal from nRF8002 goes to the
buzzer driver (transistor Q1) via jumper
JP4
. This jumper must be fitted in order for you to use the onboard
buzzer. Removing this jumper will disconnect the onboard buzzer. You can also use an external buzzer
with the PWM signal.
Figure 5.
also shows the current measurement pin header with jumper
JP5
. You can measure the current
drawn by nRF8002. Since nRF8002 current consumption appears in short pulses and varies significantly
depending on activity, a normal ampere meter will not give you an accurate picture. Replace this jumper
with a 5-10 ohm resistor and use an oscilloscope to measure nRF8002 current consumption. See the nRF
Performance Test Guidelines (nWP-006) on our website for details on how to measure dynamic current.
You can download nRF8002 Development Kit hardware schematics and PCB layout files from
www.nordicsemi.com
.
