Quectel Wireless Solutions Company Limited 201404UC15M User Manual
UMTS/HSDPA Module Series
UC15 Mini PCIe Hardware Design
UC15_Mini_PCIe_Hardware_Design Confidential / Released 18 / 40
3.3. Power Supply
The following table shows the VCC_3V3 pins and ground pins.
Table 5: VCC_3V3 and GND Pins
The typical supply voltage of UC15 Mini PCIe is 3.3V. In the 2G networks, the input peak current may
reach to 2.7A during the transmitting time, therefore the power supply must be able to provide enough
current, and a bypass capacitor of no less than 100µF with low ESR should be used to prevent the
voltage from dropping.
The following figure shows a reference design of power supply. The precision of resistor R2 and R3 is 1%,
and the capacitor C3 needs a low ESR.
Figure 3: Reference Design of Power Supply
3.4. UART Interface
The following table shows the pin definition of the UART interface.
Pin No.
Pin Name
I/O
Description
2, 39, 41, 52
VCC_3V3
PI
3.3V DC supply.
4, 9, 15, 18, 21, 26, 27, 29,
34, 35, 37, 40, 43, 50
GND
—
Mini card ground.