M10 Hardware Design
M10_HD_V3.0
- 27 -
Max:400mV
4.615ms
577us
IBAT
VBAT
Burst:1.6A
Figure 4: Ripple in supply voltage during transmitting burst
3.3.1. Power supply pins
The VBAT pins are dedicated to connect the module supply voltage. VRTC pin can be used to
connect a rechargeable coin battery or a golden capacitor which can help to maintain the system
clock when VBAT supply is not applied.
3.3.2. Minimizing supply voltage drop
Please pay special attention to the power supply design for your applications. Make sure that the
input voltage will never drop below 3.3V even in a transmitting burst during which the current
consumption may rise up to 1.6A. If the power voltage drops below 3.3V, the module could turn
off automatically. The PCB traces from the VBAT pads to the power source must be wide enough
to ensure that there is not too much voltage drop occur in the transmitting burst mode. The width
of trace should be no less than 2mm and the principle of the VBAT trace is the longer route, the
wider trace. The VBAT voltage can be measured by oscilloscope.
For the VBAT input, a bypass capacitor of about 100 µF with low ESR is recommended.
Multi-layer ceramic chip (MLCC) capacitor can provide the best combination of low ESR and
small size but may not be economical. A lower cost choice could be a 100 µF tantalum capacitor
with low ESR. Other small ceramic capacitors should be in parallel with the 100µF capacitor,
which is illustrated in Figure 5. The capacitors should be placed close to the M12 VBAT pins.
Summary of Contents for M10
Page 1: ...M10 Quectel Cellular Engine Hardware Design M10_HD_V3 0...
Page 9: ...M10 Hardware Design M10_HD_V3 0 8 7 Deleted the content of charging function...
Page 68: ...M10 Hardware Design M10_HD_V3 0 67 Figure 47 Recommendation of RF pad welding...
Page 76: ...M10 Hardware Design M10_HD_V3 0 75 6 2 Footprint of recommendation single pad...
