User's Manual

GSM/GPRS/GNSS Module Series
MC20 Hardware Design
MC20_Hardware_Design Confidential / Released 29 / 95
Figure 6: Reference Circuit for the VBAT Input (GSM Part)
3.3.2.2. Decrease Supply Voltage Drop for GNSS Part
Power supply range of GNSS part is from 2.8 to 4.3V. GNSS_VCC’s maximum average current is 40mA
during GNSS acquisition after power up. So it is important to supply sufficient current and make the power
clean and stable. The decouple combination of 10uF and 100nF capacitor is recommended nearby
GNSS_VCC pin. A reference circuit is illustrated in the following figure.
Figure 7: Reference Circuit for the GNSS_VCC Input