Vrtc; Power Output - Quectel SC200K Series Instruction Manual

3.4. VRTC

The RTC of the module can be powered by an internal power supply VBAT_BK. When VBAT is
disconnected and you need to save RTC, VBAT_BK pin cannot be kept open. The pin can be powered by
connecting with an external batter. A reference circuit is shown below.
If RTC is ineffective, the module can synchronize time through the network after being powered on.
⚫
The input voltage range of VBAT_BK is 2.0 V to 3.25 V. The typical value is 3.0 V.
⚫ If a rechargeable button battery is used, ESR of the battery should be less than 2 kΩ,. It is
recommended to use MS621FE-FL11E of SEIKO.

3.5. Power Output

The module supports multiple regulated voltage outputs for peripheral circuits. During application, it is
recommended to use 33 pF and 10 pF capacitors in parallel in the circuit to effectively suppress
high-frequency noise.
Table 9: Power Supply Description
Pin Name
VDD1V85
VDDCAMIO
VDDCAMMOT
SC200K_Series_Hardware_Design
Button
Battery
Figure 12: RTC Powered by Rechargeable Button Battery
Default Voltage (V)
1.85
1.8
2.8
VBAT_BK
Module
Drive Current (mA)
100
200
100
Smart Module Series
RTC
Core
Idle
Keeps ON
-
-
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