UM960eb & UM960Leb User Manual
UC-08-M34 EN R1.0
Power Supply
9
3.3
Backup Power Supply
2
When you do not use the hot start function, connect V_BCKP to VCC. Do not
connect it to ground or leave it floating.
When using the hot start function of the module UM960, you need to provide backup
power for the module.
The input range of V_BCKP is 2.0 V to 3.6 V.
MS621T-FL11E
Nominal Voltage:3V
Nominal Capacity:3.0mAh
BT1
MS621T-FL11E
Figure 3-5 Backup Power Circuit
Figure 3-6 Backup Power Circuit on the Bottom of EB
Note
When the backup battery supplies power to V_BCKP, the battery charging circuit
should be designed to prevent reverse current to ensure that the battery only
supplies power to V_BCKP and the current does not flow back into the 3.3 V power
domain, as the D39 shows in Figure 3-5.
According to the maximum charging current of the battery, a current-limiting
2
UM960L does not support hot start function.