UM-B-114
DA14531 Development Kit Pro Hardware User Manual
User Manual
Revision 1.4
23-Apr-2020
53 of 82
© 2021 Dialog Semiconductor
9
Known Issues
9.1
Switching Transient Artifacts of Current Measurement Circuit
When the current measurement circuit changes scale, it presents some small or large voltage step
on the A/D converter inputs. An ideal converter (infinite bandwidth) would produce a single spike at
the point of switching. But since the converter is not ideal, it produces a ringing like waveform (
).
Figure 52: A/D Converter Distortions
we can identify three types of ringing artifacts created by the A/D converter:
●
Switching from low to high scale (1)
●
Not switching, but instead a signal with very steep fall is present (2)
●
Switching from high to low scale and then another switch Low-High-Low creates this exaggerated
false peak (due to a large difference of the DC levels of the two C/V converters, 3)
9.2
Push Button SW3
SW3 is enabled on DA145xx DEVKT-P PRO-MB by P1_1. By default, this signal is not driven from
DA14531. Consequently, jumper J19:4-5 is not required in DA14531 DK PRO.
Figure 53: Disable SW3. Remove Jumper from J19:4-5
