B-WL5M-SUBG1 (STM32WL5MOC) current consumption too high
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‎2024-05-28 7:18 AM
Hello,
We have an issue with the B-WL5M-SUBG1 evaluation board: The idle current consumption is higher than expected: 89 uA (vs. expected: 1-2 uA) after joining (OTAA) successfully.
- Board: B-WL5M-SUBG1
- Firmware: STM32CubeWL/Projects/B-WL5M-SUBG1/Applications/LoRaWAN/LoRaWAN_AT_Slave and STM32CubeWL/Projects/B-WL5M-SUBG1/Applications/LoRaWAN/LoRaWAN_End_Node
- Firmware version: STM32CubeWL V1.3.0 (latest from https://github.com/STMicroelectronics/STM32CubeWL)
- Power supply: 5 V via USB-C adapter board
- Current measurement: STM32WL5MOC, not including sensors, measured at IDD jumper (JP2) using Joulescope
Do you have an idea what could be the issue?
Thanks!
Solved! Go to Solution.
- Labels:
-
LoRa
-
STM32WL series
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‎2024-05-28 10:39 AM
Hi,
To resolve this issue, we pull the UART TX and RX pins high.
Maybe that could help you.
Alexandre
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‎2024-05-28 7:29 AM
Could you please add the details of the configurations that you are doing.
Best Regards.
STTwo-32
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‎2024-05-28 7:48 AM
Hi, steps to reproduce the issue:
- Firmware: Clone from https://github.com/STMicroelectronics/STM32CubeWL, import project "LoRaWAN_AT_Slave" into STM32CubeIDE, compile "Debug" using STM32CubeIDE.
- Connect debugger (STLINK-V3PWR) to board (B-WL5M-SUBG1), flash firmware to STM32WL5MOC.
- Command to LoRaWAN_AT_Slave application: AT+JOIN=1 (OTAA join).
- Wait until it has joined.
- Measure current consumption of the board over jumper JP2 (IDD) -> 89 uA.
- Same current consumption has been measured with the application "LoRaWAN_End_Node" (change in file sys_conf.h: SENSOR_ENABLED = 0).
Thanks!
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‎2024-05-28 10:39 AM
Hi,
To resolve this issue, we pull the UART TX and RX pins high.
Maybe that could help you.
Alexandre
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‎2024-05-29 2:43 AM
Hello Alexandre,
Thank you very much for your hint, you nailed it!
We changed two things:
- Pull-up on UART RX (PA3)
- Pull-down on JTDI (PA15)
This way, the idle current consumption went down to 1.9 uA! We are very happy with this.
Details:
Projects/B-WL5M-SUBG1/Applications/LoRaWAN/LoRaWAN_AT_Slave/Core/Src/usart.c: change:
GPIO_InitStruct.Pin = USARTx_RX_Pin|USARTx_TX_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP; // <-- changed
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF8_LPUART1;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
Projects/B-WL5M-SUBG1/Applications/LoRaWAN/LoRaWAN_AT_Slave/Core/Src/gpio.c: add in function MX_GPIO_Init():
/* Configure GPIO pin : JTDI */
GPIO_InitStruct.Pin = GPIO_PIN_15;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_PULLDOWN;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
The same changes can be applied to Projects/B-WL5M-SUBG1/Applications/LoRaWAN/LoRaWAN_End_Node as well.
Thanks again!
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‎2024-05-29 5:16 AM
Excellent!
Happy to hear this news!
Alexandre
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