SARA-R4 series - System integration manual
UBX-16029218 - R20 Design-in Page 89 of 128
C1-Public
The SARA-R422-00B, SARA-R422S-00B and SARA-R422M8S-00B modules product versions do not
support AT command / data communication over USB interface: the USB interface is available on
these modules product versions for FW upgrade by means of the dedicated u-blox EasyFlash tool and
for diagnostic purposes only. Therefore, the USB interface of these modules product versions is not
designed to be connected to an external host processor mounted on the application board.
☞ It is highly recommended to provide access to V_INT, PWR_CTRL, USB_5V0, USB_3V3, USB_D+,
USB_D-, and RSVD #33 pins of the SARA-R422, SARA-R422S, and SARA-R422M8S modules for
FW upgrade and/or for diagnostic purpose, making available:
(a) accessible test points, directly connected to the related pins of the module, as illustrated in
the application circuit example (a) of Figure 60, or
(b) the specific SAMTEC FTSH-103-01-L-DV male header connector, directly connected to the
related pins of the module, as illustrated in the application circuit example (b) of Figure 60, or
(c) a generic USB device connector, connected to the related pins of the module through the
specific circuit illustrated in the application circuit example (c) of Figure 60 and Table 43.
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