Thingy:91 Serial LTE modem PSM

[Michal Mühlpachr]

I want to evaluate power consumption of nRF9160 used as AT command modem using Thingy:91 Serial LTE modem.

How to achieve lowest power consumption for Thingy:91 LTE Modem in PSM please ?

- Thingy:91 v1.0.0

- LTE modem app from ncs v1.4.0

- Modem firmware AT+CGMR mfw_nrf9160_1.2.2

- https://www.joulescope.com/

- NB IoT Vodafone CZ, +CEREG: 5,"AE38","000AC51F",9,,,"00000000","00000111"

After AT#XSLEEP=0 or AT#XSLEEP=0 I am getting ~90uA average power consumption measured on P1 (SB3 cutted).

I am not able to wake up nRF9160 by UART communication or button.

Tested with following prj.conf build options for Serial LTE modem app:

- default

- CONFIG_SLM_GPIO_WAKEUP = y

- CONFIG_SLM_GPIO_WAKEUP = y & CONFIG_SLM_INTERFACE_PIN = 26

There is not CONFIG_SLM_CONNECT_UART_0 in prj.conf as stated in documentation https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.4.0/nrf/applications/serial_lte_modem/doc/slm_description.html

but there is CONFIG_UART_0_NRF_HW_ASYNC_TIMER=2 - is it OK please ?

 

Whole default prj.conf from ncs v1.4.0:

# General config

CONFIG_LOG=y

CONFIG_LOG_DEFAULT_LEVEL=3

CONFIG_STACK_SENTINEL=y

CONFIG_NEWLIB_LIBC=y

CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y

CONFIG_RING_BUFFER=y

# Segger RTT

CONFIG_USE_SEGGER_RTT=y

CONFIG_RTT_CONSOLE=y

CONFIG_UART_CONSOLE=n

CONFIG_LOG_BACKEND_RTT=y

CONFIG_LOG_BACKEND_UART=n

# Network

CONFIG_NETWORKING=y

CONFIG_NET_SOCKETS=y

CONFIG_NET_NATIVE=n

# BSD library

CONFIG_BSD_LIBRARY=y

# Align the max FD entry to BSD_MAX_SOCKET_COUNT(8)

CONFIG_POSIX_MAX_FDS=8

# Enable below for modem trace

#CONFIG_BSD_LIBRARY_TRACE_ENABLED=y

# Use GPIO

CONFIG_GPIO=y

CONFIG_GPIO_NRFX=y

CONFIG_GPIO_NRF_P0=y

# UART interface

CONFIG_SERIAL=y

CONFIG_UART_ASYNC_API=y

CONFIG_NRFX_TIMER2=y

# LTE link control

CONFIG_LTE_LINK_CONTROL=y

CONFIG_LTE_AUTO_INIT_AND_CONNECT=n

# Stacks and heaps

CONFIG_MAIN_STACK_SIZE=4096

CONFIG_HEAP_MEM_POOL_SIZE=16384

CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=8192

# AT_CMD

# Enable AT_CMD debug for details

#CONFIG_AT_CMD_LOG_LEVEL_DBG=y

# Device power management

CONFIG_DEVICE_POWER_MANAGEMENT=y

# Enable SUPL client support

#CONFIG_SUPL_CLIENT_LIB=y

# FOTA

CONFIG_HTTP_PARSER_URL=y

CONFIG_FOTA_DOWNLOAD=y

CONFIG_FOTA_DOWNLOAD_PROGRESS_EVT=y

CONFIG_DFU_TARGET=y

CONFIG_DOWNLOAD_CLIENT=y

CONFIG_DOWNLOAD_CLIENT_STACK_SIZE=4096

CONFIG_BOOTLOADER_MCUBOOT=y

CONFIG_IMG_MANAGER=y

CONFIG_FLASH=y

CONFIG_IMG_ERASE_PROGRESSIVELY=y

# Application-specific

CONFIG_SLM_LOG_LEVEL_INF=y

# Enable GPIO wakeup if sleep is expected

#CONFIG_SLM_GPIO_WAKEUP=y

# Use UART_0 (when working with PC terminal)

CONFIG_UART_0_NRF_HW_ASYNC_TIMER=2

# Use UART_2 (when working with external MCU)

#CONFIG_SLM_CONNECT_UART_2=y

#CONFIG_UART_2_NRF_HW_ASYNC_TIMER=2

# Use optional TCP/TLS Proxy

#CONFIG_SLM_TCP_PROXY=y

# Use optional UDP/DTLS Proxy

#CONFIG_SLM_UDP_PROXY=y

[Michal Mühlpachr]

typo: After AT#XSLEEP=0 or AT#XSLEEP=1 ...