UC-08-M31 EN P1.0.3
Power Supply
7
3.1
3.3V LDO Power Supply
VCC outputs 3.3 V voltage after passing through the LDO circuit to provide power to
UM982-EB.
Vout=0.8*(1+16/5.1)=3.31V
Dropout Voltage: 170mV@1A
0805
0805
U3
TPS7A8101DRB
Figure 3-3 3.3V LDO Circuit
Notes:
The rated output current of LDO should be more than twice the maximum operating
current of UM982.
R32 is a series resistor placed at the input of the LDO, which is used for debugging. When
selecting the resistor, choose one with high rated power to ensure the current capability.
Here, a 0805 0-ohm resistor is selected.
R33 is a resistor connected in parallel with LDO. After removing R32 and soldering R33,
you can use VCC to power the module.
Summary of Contents for UM982-EB
Page 24: ...Assembly Top of UM982 EB...
Page 25: ...Assembly Bottom of UM982 EB...
