Hardware Design V1.0

NB-IoT Module Series
BC95 Hardware Design
BC95_Hardware_Design Confidential / Released 18 / 45
The following table shows the VBAT pins and ground pins.
Table 6: VBAT and GND Pins
Pin Name
Pin No.
Description
Min.
Typ.
Max.
Unit
VBAT
45, 46
Power supply for module
3.1
3.8
4.2
V
GND
2, 43, 47, 48, 51, 52,
54, 59~66, 71~74,
81~83, 92~94
Ground
-
0
-
V
3.5.2. Reference Design for Power Supply
The power supply range of the module is 3.1V to 4.2V. Make sure that the input voltage will never drop
below 3.1V even in burst transmission. If the power voltage drops below 3.1V, the module will be
abnormal. The power design for the module is very important, as the performance of power supply for the
module largely depends on the power source. The power supply is capable of providing the sufficient
current up to 0.5A at least.
For better power performance, it is recommended to place a 100uF tantalum capacitor with low ESR
(ESR=0.7Ω) and three ceramic capacitors with 100nF, 100pF and 22pF near the VBAT pin. A reference
circuit is illustrated in the following figure.
The width of trace should be designed as wider as possible and the principle of the VBAT route is the
longer route, the wider trace.
VBAT
C2C1
+
C3 C4
GND
100uF 100nF 100pF 22pF
0402 0402
Figure 3: Reference Circuit for the VBAT Input
Quectel
Confidential