Power Supply; Power Supply Pins; Decrease Voltage Drop - Quectel SC66 Hardware Design

CBL_PWR_N 22 DI
AI/
DP_AUX_P 221
AO
AI/
DP_AUX_N 220
AO
Reserved pins
Pin
Pin Name I/O
No.
17,
213,
214,
215,
RESERVED
216,
217,
222,
235
NOTE
1)
uUSB refers to any USB interface except for USB Type-C.

3.4. Power Supply

3.4.1. Power Supply Pins

SC66 provides three VBAT pins, two VDD_RF pins and one VPH_PWR pin. VBAT pins must be
connected to an external power supply. VDD_RF pins are used to connect bypass capacitors of external
RF Power supply, so as to eliminate voltage fluctuation of RF part. VPH_PWR is used for powering other
devices.

3.4.2. Decrease Voltage Drop

The power supply range of the module is from 3.55V to 4.4V, and the recommended value is 4.0V. The
power supply performance, such as load capacity, voltage ripple, etc. directly influences the module's
performance and stability. Under ultimate conditions, the module may have a transient peak current up to
3A. If the power supply capability is not sufficient, there will be voltage drops, and if the voltage drops
below 2.85V, the module will be powered off automatically. Therefore, please make sure the input voltage
will never drop below 2.85V.
SC66_Hardware_Design
Used for configuring
auto power-on
DisplayPort auxiliary
channel (+)
DisplayPort auxiliary
channel (-)
DC
Description
Characteristics
Reserved pins
Smart LTE Module Series
SC66 Hardware Design
If customers require
automatic power-on,
this pin should be
shorted-to-ground.
Comment
Keep these pins open.
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