Ublox SARA-R4 Series, Руководство по системной интеграции

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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 .
29
USB_D+
28
USB_D-
GND
SARA-R422 /-R422S /-R422M8S
2 USB_3V3
17 USB_5V0
33
RSVD
Test-Point
4
V_INT
D+
D-
GND
USB DEVICE
CONNECTOR
VBUS
D1 D2 D3
VIN VOUT
LDO Regulator
Enable
U1
C2
R1
GND
C1
U2
29
USB_D+
28
USB_D-
GND
SARA-R422 /-R422S /-R422M8S
2
USB_3V3
Test-Point
Test-Point
Test-Point
17
USB_5V0
Test-Point
33
RSVD
Test-Point
4
V_INT
Test-Point
29
USB_D+
28 USB_D-
GND
SARA-R422 /-R422S /-R422M8S
2
USB_3V3
17
USB_5V0
33
RSVD
Test-Point
4 V_INT
GND
USB_D-
USB_5V0
USB_3V3
USB_D+
V_INT
SAMTEC
FTSH-103-01-L-DV
Male Header Connector
Top View
(a)
(b)
(c)
Figure 60: USB Interface application circuits for SARA-R422, SARA-R422S and SARA-R422M8S modules
Reference Description Part Number - Manufacturer
C1, C2 1
µ
F Capacitor Ceramic X7R 16 V Generic manufacturer
D1, D2, D3 Very Low Capacitance ESD Protection PESD0402-140 - Littelfuse
R1 10 k  Resistor 0402 5% 0.1 W Various manufacturers
U1 LDO Linear Regulator 3.3 V 150 mA NCP600SN330T1G - ON Semiconductor
U2 NPN/PNP 10k/47k Biased Silicon Transistor BCR35PN - Infineon Technologies
Table 43: Components for USB application circuits for SARA-R422, SARA-R422S and SARA-R422M8S modules