GSM/GPRS/GNSS Module Series
MC60 Series Hardware Design
MC60_Series_Hardware_Design Confidential / Released 28 / 114
Vdrop
4.615ms
577us
IBAT
VBAT
Burst: 1.6A
Figure 5: Voltage Ripple during Transmitting (GSM Part)
3.5.1.2. Power Features of GNSS Part
In All-in-one solution, the power supply of GNSS part is controlled by the GSM part through the
GNSS_VCC_EN pin. In Stand-alone solution, the power supply of GNSS part is controlled independently
via an external switch of MCU.
3.5.2. Decrease Supply Voltage Drop
3.5.2.1. Decrease Supply Voltage Drop for GSM Part
Power supply range of the GSM part is from 3.3V to 4.6V. Make sure that the input voltage will never drop
below 3.3V even in a burst transmission. If the power voltage drops below 3.3V, the module will be turned
off automatically. For better power performance, it is recommended to place a 100uF tantalum capacitor
with low ESR (ESR=0.7Ω) and ceramic capacitors 100nF, 33pF and 10pF near the VBAT pin. A reference
circuit is illustrated in the following figure.
The VBAT trace should be wide enough to ensure that there is not too much voltage drop during burst
transmission. The width of trace should be no less than 2mm; and in principle, the longer the VBAT trace,
the wider it will be.
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