Power Supply; Power Supply Pins; Voltage Stability Requirements - Quectel SC20 Series Hardware Design

RESET_N
USB_BOOT
CHARGE_SEL
Reserved Pins
Pin Name
RESERVED

3.4. Power Supply

3.4.1. Power Supply Pins

SC20 series provides two VBAT_RF pins and two VBAT_BB pins for connection with the external power
supply. The VBAT_RF pins are used for the RF part of the module and the VBAT_BB pins are used for
the baseband part of the module.

3.4.2. Voltage Stability Requirements

The power supply range of the module is 3.5–4.2 V, and the recommended value is 3.8 V. The power
supply performance, such as load capacity, voltage ripple, etc. directly influences the module's
performance and stability. Under ultimate conditions, the transient peak current of the module may surge
up to 3 A. If the supply voltage is not enough, there will be voltage drops, and if the voltage drops below
3.1 V, the module will be turned off automatically. Therefore, make sure the input voltage never drops
SC20_Series_Hardware_Design
Resets the
179 DI
module
Forces the
module to enter
46 DI
emergency
download mode
127 DI Charger select
Pin No.
151, 152, 153, 154, 155, 156, 157, 158, 159, 183, 187,
190, 191, 194, 195, 196, 197, 199, 202, 203, 204, 205,
206, 207, 210
Smart Module Series
Disabled by default
and can be enabled
through software
configuration.
You can force the
module to enter
emergency
download mode by
pulling it up to
LDO5_1V8 during
power-up.
If you use an
internal charging
chip, keep this pin
open.
If you use an
external charging
chip, connect it to
GND.
Comment
Keep these pins
open.
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