STM8AF5288 halt() supply current

[HolgerG]

Hi, I use a PCB that is reduced to one STM8AF5288 and 3 100nF Capacitors. No other components, all are removed. I supply it with 3,3V. I want to reduce current consumption in halt-mode to 4,5uA. Some others posted simliar problems, I could never find a working solution. My current consumption in halt mode is:

350uA at 3V

550uA at 3,3

1050uA at 3,7

Here is my code, can anyone please help? I am really in trouble.

Thank you very much,

Holger

void main(void)
{  
    CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV8); // 2 MHz
    GPIO_Init(GPIOA, GPIO_PIN_ALL, GPIO_MODE_IN_PU_NO_IT);
    GPIO_Init(GPIOB, GPIO_PIN_ALL, GPIO_MODE_IN_PU_NO_IT);
    GPIO_Init(GPIOC, GPIO_PIN_ALL, GPIO_MODE_IN_PU_NO_IT);
    GPIO_Init(GPIOD, GPIO_PIN_ALL, GPIO_MODE_IN_PU_NO_IT);    
    ADC1->CR1=0x00;
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_ADC, DISABLE);
    //Only Timer 1, 2 and 4 seem to exist
    TIM1->CR1=0x00;
    TIM2->CR1=0x00;
    TIM4->CR1=0x00;
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER1, DISABLE);
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER2, DISABLE);
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER4, DISABLE);
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_AWU, DISABLE);
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_UART1, DISABLE);
    UART1->CR1 = 0x20;
    UART1->CR3 = 0x00;
    #define CAN_MCR  (*((volatile uint8_t*)0x5420))
    CAN_MCR = 0x02;
    //CAN->MCR = 0x02; //This does not work, the above code is a workaround
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_CAN, DISABLE);
    SPI->CR1=0x00;
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_SPI, DISABLE);
    I2C->CR1 = 0x00;
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_I2C, DISABLE);
    IWDG->KR =0x00;
    WWDG->CR=0x00;
    AWU->CSR = 0x00;
    FLASH->CR1=0x00;    
    disableInterrupts();
    CLK->CKDIVR = 0xFF; // max. Prescaler für CPU und Peripherie
    __asm__("halt");    
    while (1)
    {
    }
}

---

Post edited to apply source code formatting - please see How to insert source code for future reference.

[HolgerG · Accepted solution]

I found the cause of high current. It is a wiring bug: I connected V_CAP to 3,3V. V_CAP must be 1,8V, there must only a capacitor be connected to V_CAP. So please close the topic.

[Andrew Neil]

---

@HolgerG wrote:

So please close the topic.

---

You do that by marking your post as the solution:

https://community.st.com/t5/community-guidelines/help-others-to-solve-their-issues/ta-p/575256

Please see also: How to insert source code.