unicore UM220-IV NL, Installation And Operation User Manual, Page: 14 / 23

9
No Name I/O Electrical level Description
22 V_BCKP I 1.65V~3.6V
Backup voltage supply
If you do not use the hot start function,
connect V_BCKP to VCC. Do NOT
connect it to ground or leave it
floating.
23 VCC — 3.0V~3.6 V Main power
24 GND — Ground
3.5 PCB Packaging
Figure 3-3 UM220-IV NL Recommended PCB Packaging
（
unit: mil
，
in brackets: mm
）

In the design of PCB solder, make sure that the area under the UM220-IV NL module is
fully covered with solder mask.