User's Manual

H350 LGA Serials Module Hardware User Manual Page of
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25
EGSM900
PCL=10
Band8
1 247.9
4 373.7
1 89
4 220.3
5.1.3 VIO
VIO is power supply for the digital portion of the circuit inside of the module; it can be used for indicating
signal of the module. VIO can be used as a reference level of the module digital signal.
Parameter Minimum Value Recommended Value Maximum Value Unit
VIO @working 1.773 1.8 1.827 V
5.1.4 VRTC
VRTC supplies power for RTC clock inside the module, can be connected to external RTC battery.
Parameter Minimum Value Recommended Value Maximum Value Unit
VRTC output voltage 1.71 1.8 1.89 V
VRTC input voltage
(RTC is working)
0.5 1.8 1.89 V
VRTC input current
(RTC is working)
1.0 uA
VRTC Reference design:
Figure 5- 1 VRTC Reference Design