SARA-R4 series - System Integration Manual
UBX-16029218 - R06
System description
Page 13 of 102
Function
Pin Name
Pin No
I/O
Description
Remarks
Audio
I2S_TXD /
SPI_CS
35
O
I
2
S transmit data
I
2
S transmit data, alternatively configurable as
SPI Chip Select
Not supported by “00”, “01” and “02” product versions.
See section 1.10 for functional description.
See section 2.7 for external circuit design-in.
I2S_RXD /
SPI_MISO
37
I
I
2
S receive data
I
2
S receive data, alternatively configurable as
SPI Master Input Slave Output
Not supported by “00”, “01” and “02” product versions.
See section 1.10 for functional description.
See section 2.7 for external circuit design-in.
I2S_CLK /
SPI_CLK
36
I/O
I
2
S clock
I
2
S clock, alternatively configurable as
SPI clock
Not supported by “00”, “01” and “02” product versions.
See section 1.10 for functional description.
See section 2.7 for external circuit design-in.
I2S_WA /
SPI_MOSI
34
I/O
I
2
S word alignment
I
2
S word alignment, alternatively configurable as
SPI Master Output Slave Input
Not supported by “00”, “01” and “02” product versions.
See section 1.10 for functional description.
See section 2.7 for external circuit design-in.
GPIO
GPIO1
16
I/O
GPIO
1.8 V GPIO with alternatively configurable functions.
See section 1.11 for functional description.
See section 2.8 for external circuit design-in.
GPIO2
23
I/O
GPIO
1.8 V GPIO with alternatively configurable functions.
See section 1.11 for functional description.
See section 2.8 for external circuit design-in.
GPIO3
24
I/O
GPIO
1.8 V GPIO with alternatively configurable functions.
See section 1.11 for functional description.
See section 2.8 for external circuit design-in.
GPIO4
25
I/O
GPIO
1.8 V GPIO with alternatively configurable functions.
See section 1.11 for functional description.
See section 2.8 for external circuit design-in.
GPIO5
42
I/O
GPIO
1.8 V GPIO with alternatively configurable functions.
See section 1.11 for functional description.
See section 2.8 for external circuit design-in.
GPIO6
19
I/O
GPIO
1.8 V GPIO with alternatively configurable functions.
See section 1.11 for functional description.
See section 2.8 for external circuit design-in.
Reserved
RSVD
33
N/A
Reserved pin
This pin can be connected to GND.
See sections 1.12 and 2.9
RSVD
2, 31
N/A
Reserved pin
Leave unconnected.
See sections 1.12 and 2.9
Table 3: SARA-R4 series module pin definition, grouped by function