User's Manual

SARA-R4 series - System Integration Manual

UBX-16029218 - R03 System description

Page 26 of 94

The USB interface of SARA-R4 series modules can provide the following USB functions:

 AT commands and data communication

 Diagnostic log

The USB profile of SARA-R4 series modules identifies itself by the following VID (Vendor ID) and PID (Product ID)

combination, included in the USB device descriptor according to the USB 2.0 specifications [4].

 VID = 0x05C6

 PID = 0x90B2

1.9.3 DDC (I

C) interface

The I

C interface is not supported by “00” and “01” product versions.

1.10 General Purpose Input/Output

SARA-R4 series modules include six pins (GPIO1-GPIO6) which can be configured as General Purpose

Input/Output or to provide custom functions via u-blox AT commands (for more details see the SARA-R4 series

AT Commands Manual [2], +UGPIOC, +UGPIOR, +UGPIOW AT commands), as summarized in Table 8.

Function

Description

Default GPIO

Network status indication

Network status: registered / data transmission, no service

SIM card detection

SIM card physical presence detection

GPIO5

Module status indication

Module switched off or in PSM low power deep sleep mode,

versus active or connected mode

General purpose input

Input to sense high or low digital level

General purpose output

Output to set the high or the low digital level

GPIO4

Pin disabled

Tri-state with an internal active pull-down enabled

GPIO1, GPIO2,

GPIO3, GPIO6

Table 8: SARA-R4 series GPIO custom functions configuration

1.11 Reserved pins (RSVD)

SARA-R4 series modules have pins reserved for future use, marked as RSVD: they can all be left unconnected on

the application board.