NB-IoT Module Series
BC66&BC660K-GL Compatible Design
BC66&BC660K-GL_Compatible_Design 22 / 30
⚫
1. For BC66, its USB_MODE must be pulled down to realize the USB download function.
2. For BC66, when its USB interface is used for log capturing, the module cannot enter Deep Sleep
mode.
3. For BC66, to use its USB function, an external 3.3 V power supply should be provided.
4.7. USIM Interface
⚫ BC66 supports 1.8 V USIM cards.
⚫ BC660K-GL supports 1.8/3.0 V USIM cards.
The USIM interfaces of BC66/BC660K-GL are compatible with each other. A compatible reference design
for the USIM interfaces connected with a 6-pin USIM card connector is shown in the figure below:
22 Ω
22 Ω
22 Ω
100 nF
USIM Card Connector
GND
ESD
33 pF 33 pF 33 pF
VCC
RST
CLK IO
VPP
GND
GND
10 kΩ
USIM_VDD
SIM_GND USIM_GND
SIM_VDD USIM_VDD
SIM_RST USIM_RST
SIM_CLK USIM_CLK
SIM_DATA USIM_DATA
BC66/BC660K-GL
Figure 12: Compatible Reference Design for USIM Interface
1. It is necessary to add a 10 kΩ pull-up resistor between USIM_DATA and USIM_VDD to improve the
anti-interference ability.
2. The red part in the above figure is for BC66.
3. The black part in the above figure is for BC660K-GL.
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