Ublox SARA-R4 Series - Page 14

SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R11 System description Page 14 of 157
Function
Pin Name
Pin No
I/O
Description
Remarks
USB
VUSB_DET
17
I
USB detect input
VBUS (5 V typical) USB supply generated by the host must be
connected to this input pin to enable the USB interface.
Test-Point for diagnostic / FW update strongly recommended.
See section 1.9.2 for functional description.
See section 2.6.2 for external circuit design-in.
USB_D-
28
I/O
USB Data Line D-
USB interface for AT commands, data communication, FOAT,
FW update by u-blox tool, diagnostics.
90  nominal differential impedance (Z
0
)
30  nominal common mode impedance (Z
CM
)
Pull-up or pull-down resistors and external series resistors as
required by the USB 2.0 specifications [4] are part of the USB
pin driver and need not be provided externally.
Test-Point for diagnostic / FW update strongly recommended.
See section 1.9.2 for functional description.
See section 2.6.2 for external circuit design-in.
USB_D+
29
I/O
USB Data Line D+
USB interface for AT commands, data communication, FOAT,
FW update by u-blox tool, diagnostics.
90  nominal differential impedance (Z
0
)
30  nominal common mode impedance (Z
CM
)
Pull-up or pull-down resistors and external series resistors as
required by the USB 2.0 specifications [4] are part of the USB
pin driver and need not be provided externally.
Test-Point for diagnostic / FW update strongly recommended.
See section 1.9.2 for functional description.
See section 2.6.2 for external circuit design-in.
SPI
I2S_WA /
SPI_MOSI
34
O
SPI MOSI
SPI Master Output Slave Input, alternatively configurable as I
2
S
word alignment
Not supported by “00”, “01” and “x2” product versions.
See section 1.9.3 for functional description.
See section 2.6.3 for external circuit design-in.
I2S_RXD /
SPI_MISO
37
I
SPI MISO
SPI Master Input Slave Output, alternatively configurable as I
2
S
receive data
Not supported by “00”, “01” and “x2” product versions.
See section 1.9.3 for functional description.
See section 2.6.3 for external circuit design-in.
I2S_CLK /
SPI_CLK
36
O
SPI clock
SPI clock, alternatively configurable as I
2
S clock
Not supported by “00”, “01” and “x2” product versions.
See section 1.9.3 for functional description.
See section 2.6.3 for external circuit design-in.
I2S_TXD /
SPI_CS
35
O
SPI Chip Select
SPI Chip Select, alternatively settable as I
2
S transmit data
Not supported by “00”, “01” and “x2” product versions.
See section 1.9.3 for functional description.
See section 2.6.3 for external circuit design-in.