Product Info

LPWA Module Series
BC66-NA Hardware Design
BC66-NA_Hardware_Design 30 / 59
Figure 14: Reset Timing
3.8. USB Interface
The USB interface of BC26 module conforms to USB 1.1 specifications and supports full speed (12Mbps)
mode. The interface can be used for software debugging and software upgrading, and supports USB
serial driver under Windows/Linux operating systems.
The following table is the pin definition of USB interface:
Table 9: Pin Definition of USB Interface
Pin Name Pin No. I/O Description Note
USB_MODE 47 DI
Pull down the pin to achieve USB
download function
VUSB_3V3 49 PI USB power supply Vnorm=3.3V
USB_DP 50 IO USB differential data (+)
Conform to USB 1.1
specifications.
Require 90Ω differential
impedance.
USB_DM 51 IO USB differential data (-)