STM32F103C8T6 low power consumption issue

chenbingjy

STM32F103C8T6 low power consumption issue [Copy link]

I am making a product that needs low power consumption. The chip is STM32F103C8T6. There is an STM32F103C8T6 chip, a Bluetooth module, 10 buttons, and an indicator light on the board. It is powered by CR2032. Without the low power consumption function, the battery is used up in one day. Later, a low-power sleep mode was added. The program is as follows: int main(void){u8 **; long int i; char flag=0; Stm32_Clock_Init(9); //72MHz //IWDG_Init(6,800); //Watchdog initialization, 256 division, 800 counts, reset time 5s CPU_Init(); //CPU initialization VAR_Init(); //Variable initialization Timer_Init(); //Timer initialization //usart1_init(115200); //Serial port 1 initialization usart1_init(9600); usart2_init(115200); //Serial port 2 initialization InitKeyboard(); But after trying it, the battery is still used up in one day. Can an expert take a look and tell me what's wrong? Thank you!

懒猫爱飞

Low power consumption of 103 has not been done yet. You can start from the following places: 1) Before going to bed, set the high and low levels of the corresponding ports to be consistent with the peripheral circuits. For example, if the peripheral is high, you also set the corresponding IO to high. 2) Before hibernation, manually turn off unused peripherals, such as serial ports, ADC, I2C, etc., and reinitialize them after waking up. 3) First use the minimum system to enter the hibernation state to test the power consumption. 4) Then calculate the power consumption of the peripherals. 5) You can add a power switch to the peripherals that consume more power, and turn off the power when not in use.

damiaa

Saving power on the IO port is very important. I remember using PIC16LC62 to make a gas meter N years ago. That reached 10UA. The peripheral IO port was constantly measured. From a few milliamperes to 10UA. All of this was done from the IO port. The CPU itself can reach 1~2 microamperes. In fact, you can use STM32L0XX or STM8LXX. This is better. And it has an internal EEPROM. It is difficult to achieve low power consumption with an external EEPROM.

DELAN1234567

The CR2032 battery discharge current is not suitable for more than 20MA, so it is not suitable to use STM32; a Bluetooth IC should be used to handle this product.

chenbingjy

DELAN1234567 posted on 2019-3-6 12:33 The discharge current of CR2032 battery is not suitable for more than 20MA, so it is not suitable to use STM32; a Bluetooth IC should be used to handle this product

So what kind of battery should be used? Recommend one. In addition, I have never used Bluetooth IC, can it be programmed? Because I still have buttons and indicator lights. Thank you!

DELAN1234567

chenbingjy posted on 2019-3-6 13:12 What kind of battery should I use? Please recommend one. Also, I have never used Bluetooth IC before. Can it be programmed? Because I still have buttons and indicator lights. Thank you!

I think you may want to use Bluetooth BLE. CC2640 and nrf51822 can handle it.

chenbingjy

DELAN1234567 posted on 2019-3-7 09:42 I think you may want to use Bluetooth BLE, CC2640, nrf51822 can do it

Thank you! I don't know much about these. If I use CC2640, can this chip cut off the power supply of Bluetooth when Bluetooth is in use?

DELAN1234567

chenbingjy posted on 2019-3-7 10:27 Thank you! I don't know much about these. If I use CC2640, can this chip cut off the power supply of Bluetooth when Bluetooth is in use?

CC2640 can wake up with ultra-low power consumption of a few tenths of a microamp, and the transmission current is also small, which is suitable for CR2032. You should read the manual of CC2640 and respond to your project requirements.

DELAN1234567

The following is the current of the product using CC2640r2: /*Working current is based on the Panasonic CR2032 battery capacity of 220mAH Working state Maximum current Maximum time Connecting 7mA (0DBm) 5 seconds connected 1.2mA 10 seconds no connection idle 1.2mA 220mAH/1.2mA=183 hours (when a key is pressed continuously) Sleep 0.1uA 220mAH/0.1uA=2200000 hours=251 years*/

chenbingjy

DELAN1234567 posted on 2019-3-7 15:46 The following is the current of the product made with CC2640r2: /*The working current is based on the Panasonic CR2032 battery capacity of 220mAH. The maximum current in the working state...

Thank you! I'll take a look