STM32L151 Stop mode power consumption

Posted on November 20, 2014 at 12:47

I am trying to get lowest power mode(in stop mode) of STM32L151RB. According to datasheet, power consumption in lowest achievable mode is below 14uA. But I am getting 40uA minimum on my device. I have tried different combination and i have disabled every thing(ADC,USART,Timers,USB,SPI) which i can but i am unable to get anywhere near 14uA. What I am doing wrong ? Only thing which is enable are some IOs which are necessary to keep running my board(like JTAG,Accelerometer interrupt pin,USB detection pin etc).Can anyone guide me please?

Another question ... When I declare JTAG pins(PA.13,PA.14) as AN_Input to lower power consumption,code hangs after executing those line. I have seen many codes which declare JTAG pins as input whch means it's normal to change AF of those pins.Why my code hangs after making those pins as analog input?

ADC_Channel_Init(DISABLE);

ADC_StopConversion();

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, DISABLE); 

USART_Cmd(USART1, DISABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, DISABLE); 

USART_Cmd(USART2, DISABLE);

/* DisableSPI1 */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, DISABLE); 

SPI_Cmd(SPI1, DISABLE);

/* Disable SPI2 */

RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, DISABLE); 

SPI_Cmd(SPI2, DISABLE);

Timer_Init(Timer2,DISABLE);

Timer_Init(Timer3,DISABLE);

//Power off USB

PowerOff();

RCC_APB1PeriphClockCmd(RCC_APB1Periph_USB, DISABLE);

NVIC_InitStructure.NVIC_IRQChannel = USB_LP_IRQn;

NVIC_InitStructure.NVIC_IRQChannelCmd = DISABLE;

NVIC_Init(&NVIC_InitStructure);

Delay_ms(500);

/* To stop the sys tick for avoid IT */

SysTick->CTRL = 0;

SysTick->CTRL  &= ~SysTick_CTRL_TICKINT_Msk;        // systick IRQ off

//////////////////////////////// Enaabling STM32L deep sleep mode

PWR_FastWakeUpCmd(DISABLE);

// Disable PVD 

PWR_PVDCmd(DISABLE);

// Enable Ultra low power mode 

 PWR_UltraLowPowerCmd(ENABLE);

// Disable FLASH during SLeep  

FLASH_SLEEPPowerDownCmd(ENABLE);

// Enable the PWR APB1 Clock 

RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);

// Configure the MSI frequency 

RCC_MSIRangeConfig(RCC_ICSCR_MSIRANGE_0);

// Select MSI as system clock source 

RCC_SYSCLKConfig(RCC_SYSCLKSource_MSI);

// Wait until MSI is used as system clock source 

while (RCC_GetSYSCLKSource() != 0x00);

// Select the Voltage Range 3 (1.2V) 

PWR_VoltageScalingConfig(PWR_VoltageScaling_Range3);

// Wait Until the Voltage Regulator is ready 

while (PWR_GetFlagStatus(PWR_FLAG_VOS) != RESET);

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOB | RCC_AHBPeriph_GPIOC | RCC_AHBPeriph_GPIOD, ENABLE);

GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11 | GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;

GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_InitStructure.GPIO_Speed = GPIO_CLOCK_SPEED;

GPIO_Init(GPIOD, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11 | GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;

GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_InitStructure.GPIO_Speed = GPIO_CLOCK_SPEED;

GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11/* | GPIO_Pin_12 */| GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;

GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_InitStructure.GPIO_Speed = GPIO_CLOCK_SPEED;

GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5 |GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 /*| GPIO_Pin_11 | GPIO_Pin_12 *//*| GPIO_Pin_13 | GPIO_Pin_14 */| GPIO_Pin_15;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;

GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_InitStructure.GPIO_Speed = GPIO_CLOCK_SPEED;

GPIO_Init(GPIOA, &GPIO_InitStructure);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, DISABLE);

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOB | RCC_AHBPeriph_GPIOC | RCC_AHBPeriph_GPIOD | RCC_AHBPeriph_GPIOH, DISABLE);

#stm32 #stm32l #power #stop-mode