NB-IoT
Module Series
BC660K-GL Hardware Design
BC660K-GL_Hardware_Design 22 / 57
VBAT
VDD_EXT
RUNNING
Deep Sleep
Module
Status
PSM_EINT
˂ 1 ms
Figure 4: Timing of Waking Up Module from PSM
3.5. Power Supply
3.5.1. Power Supply Pins
The module provides two VBAT pins for connection with an external power supply. The table below
describes the module's VBAT and ground pins.
Table 8: Power Supply Pins
3.5.2. Power Supply Reference Design
Power design for a module is critical to its performance. It is recommended to use a low quiescent current
LDO with an output capacity of 0.5 A to regulate the power supply for BC660K-GL. Lithium-thionyl
chloride (Li-SOCl2) batteries and Lithium manganese oxide (LiMn2O4) batteries can be used as the
power supply. The supply voltage of the module ranges from 2.2 V to 4.3 V. When the module is working,
ensure its input voltage never drops below 2.2 V; otherwise, the module cannot work normally.
For better power performance, it is recommended to place a 100
μF tantalum capacitor with low ESR
(ESR = 0.7
Ω) and three ceramic capacitors (100 nF, 100 pF and 22 pF) near the VBAT pins. Also, it is
recommended to add a TVS diode on the VBAT trace (near VBAT pins) to improve surge voltage
Pin Name
Pin No.
Description
Min.
Typ.
Max.
Unit
VBAT
42, 43
Power supply for the
module
2.2
3.3
4.3
V
GND
1, 27, 34, 36, 37, 40, 41, 56, 57, 58
-
-
-
V
