The stable power supply can ensure the normal operation of FM101 module; and the ripple
of the power supply should be less than 300mVpp in design. When the module operates
with the maximum emission power, the maximum operating current can reach 2.5A, so the
power source should be not lower than 3.135V, or the module may shut down or reboot.
The power supply limits are shown in Figure 5:
Figure 5. Power supply requirement
3.2.2 Logic Level
The FM101 module 1.8V logic level definition is shown in the following table:
Table 9. Module 1.8V logic level definition
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