Quectel BC66 - Page 15

NB-IoT Module Series
BC66&BC660K-GL Compatible Design
BC66&BC660K-GL_Compatible_Design 14 / 30
1. The pins in red are compatible pins of different functions.
2. The pins in black are compatible pins of the same functions.
3. Keep all reserved and unused pins disconnected.
4.
1)
When VIO_SEL is grounded and VBAT ˂ 3.3 V, VDD_EXT = VBAT;
When VIO_SEL is grounded and VBAT ≥ 3.3 V, VDD_EXT = 3.3 V;
When VIO_SEL is floating, VDD_EXT = 1.8 V.
43
VBAT_RF
PI
Power supply for the
module’s RF part
VBAT
PI
Power supply for the
module
47
USB_MODE
DI
Pull down the pin
to enable USB
download function
RESERVED
-
-
49
VUSB_3V3
PI
USB power supply
RESERVED
-
-
50
USB_DP
DIO
USB differential
data (+)
RESERVED
-
-
51
USB_DM
DIO
USB differential
data (-)
RESERVED
-
-
52
RESERVED
-
-
VIO_SEL
DI
IO Voltage selection
1)
54
RESERVED
-
-
GRFC1*
DO
Generic RF controller
55
RESERVED
-
-
GRFC2*
DO
Generic RF controller
56
RESERVED
-
-
GND
-
Ground
57
RESERVED
-
-
GND
-
Ground
58
RESERVED
-
-
GND
-
Ground
1, 27,
34, 36,
37, 40,
41
GND
-
Ground
GND
-
Ground
2, 8,
21–23,
25–26,
30–33,
44–46,
48, 53
RESERVED
-
-
RESERVED
-
-
NOTES