LARA-R6 series - Data sheet

UBX-21004391 - R09

Interfaces

Page 15 of 41

C1-Public

2.6 Audio interface

☞ LARA-R6001D the LARA-R6401D data-only product versions do not support of voice / audio.

LARA-R6 series modules support Voice over LTE (VoLTE) as well as Circuit-Switched Fall-Back

(CSFB) from LTE to 3G or 2G radio bearer for providing audio services.

LARA-R6 series modules include a 4-wire I2S digital audio interface (I2S_TXD, I2S_RXD, I2S_CLK,

I2S_WA) that can be configured by AT command to transfer digital audio data to/from an external

device as an audio codec.

For more details regarding I2S digital audio interface possible configurations, usage and guideline for

the integration with an external digital audio device as an audio codec, see the LARA-R6 series system

integration manual [2] and the audio sections in the AT commands manual [1].

2.7 Clock output

☞ LARA-R6001D the LARA-R6401D data-only product versions do not support GPIO6 clock output.

LARA-R6 series modules provide digital clock output functionality on the GPIO6 pin. This is mainly

designed to feed the clock input of an external audio codec, as the clock output is generated only when

the audio is active. For more details, see the AT commands manual [1], +UMCLK AT command.

2.8 GPIO pins

LARA-R6 series modules include 9 pins (GPIO1-GPIO5, I2S_TXD, I2S_RXD, I2S_CLK, I2S_WA) that

can be configured as General Purpose Input/Output or to provide custom functions as summarized in

the Table 5 (for further details, see the GPIO section in the AT commands manual [1]).

Function

Description

Default GPIO

Configurable GPIOs

Network status

indication

Network status: registered home network, registered

roaming, data transmission, no service

--

GPIO1, GPIO2,

GPIO3, GPIO4

GNSS supply

enable

Enable/disable the supply of u-blox GNSS receiver

connected to the cellular module

GPIO2

GPIO1, GPIO2,

GPIO3, GPIO4

GNSS data ready

Sense when u-blox GNSS receiver connected to the module

is ready for sending data by the I2C

GPIO3

GPIO3

SIM card detection External SIM card physical presence detection

GPIO5

GPIO5

SIM card hot

insertion/removal

Enable / disable SIM interface upon detection of external

SIM card physical insertion / removal

--

GPIO5

RI

Main UART Ring Indicator output function

--

All

DTR

Main UART DTR input line function

--

GPIO3, GPIO4

Last gasp

Input to trigger last gasp notification by applying a rising or

falling edge according to AT+ULGASP setting

--

GPIO3

Faster and safe

power-off

Input to trigger emergency fast and safe shutdown of the

module (as AT+CFUN=10) by applying a rising edge

--

GPIO3

I2S digital audio

interface 7

I2S digital audio interface

I2S_RXD, I2S_TXD,

I2S_CLK, I2S_WA

I2S_RXD, I2S_TXD,

I2S_CLK, I2S_WA

General purpose

input

Input to sense high or low digital level

--

All

General purpose

output

Output to set the high or the low digital level

GPIO4

All

Pin disabled

Tri-state with an internal active pull-down enabled

GPIO1

All

Table 5: GPIO custom functions configuration

7 I2S is not supported by LARA-R6001D and LARA-R6401D data-only versions: I2S pins are by default set as Pin disabled.