H330SS LGA Module Hardware User Manual Page 21 of 38
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)
1.5
uA
VRTC Reference design:
Figure 5-1
Note:
R8 is the current-limiting resistance
VRTC Current consumption < 2uA;
in order to ensure VRTC working normally. When it is working fine,
R8 ≥1kohm
C9 value can affect RTC hold time
