UMTS/HSPA Module Series
UC20 Hardware Design
UC20_Hardware_Design Confidential / Released 28 / 82
1. The W_DISABLE# control function is disabled in firmware by default. It can be enabled by AT
command AT+QCFG=“airplanecontrol”. Refer to document [1].
2. When the module is in sleep mode, the W_DISABLE# control is invalid. Please be sure to wake the
module up first.
3. GNSS function is still available when RF function is disabled.
3.6. Power Supply
3.6.1. Power Supply Pins
UC20 provides four VBAT pins dedicated to connect with the external power supply. There are two
separate voltage domains for VBAT.
VBAT_RF with two pads for module RF part.
VBAT_BB with two pads for module baseband part.
The following table shows the VBAT pins and ground pins.
Table 6: VBAT and GND Pins
Power supply for module RF
part.
Power supply for module
baseband part.
8,9,19,36,46,
48,50~54,56,
72, 85~112
3.6.2. Decrease Voltage Drop
The power supply range of the module is 3.3V ~ 4.3V. Make sure the input voltage will never drop below
3.3V. If the voltage drops below 3.3V, the module will turn off automatically. The following figure shows the
voltage drop during transmitting burst in 2G network, the voltage drop will be less in 3G network.
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