Difference between revisions of "N-L15 preparations"

Latest revision as of 07:41, 26 August 2017

Reducing the sleep current

• Nucleo L152RE power consumption in deepsleep and sleep

<cpp> // NIKOS: THIS WORKS REDUCING THE POWER DRASTICALLY GPIO_InitTypeDef GPIO_InitStructure = {0}; GPIO_InitStructure.Pin = GPIO_PIN_All; GPIO_InitStructure.Mode = GPIO_MODE_ANALOG; GPIO_InitStructure.Pull = GPIO_NOPULL; //HAL_GPIO_Init(GPIOA, &GPIO_InitStructure); //HAL_GPIO_Init(GPIOB, &GPIO_InitStructure); HAL_GPIO_Init(GPIOC, &GPIO_InitStructure); HAL_GPIO_Init(GPIOD, &GPIO_InitStructure); HAL_GPIO_Init(GPIOH, &GPIO_InitStructure); </cpp>

Wake time

wake time 17ms:

uVision ST-LINK configuration

No more need for manual reset for flash programming

32.768 KHz

• https://developer.mbed.org/questions/4531/RTC-External-Crystal-Nucleo/

Redirect printf()

<cpp> Serial pc(PA_9, PA_10); //N-L15 UART1 IS CONNECTED TO FTDI </cpp>

RTC

• https://developer.mbed.org/users/kenjiArai/code/SetRTC/rev/3129de8d50ea

sht21

1 Start Up Sensor
As a first step, the sensor is powered up to the chosen
supply voltage VDD (between 2.1V and 3.6V). After
power-up, the sensor needs at most 15ms, while SCL is
high, for reaching idle state, i.e. to be ready accepting
commands from the master (MCU). Current consumption
during start up is 350µA maximum. Whenever the sensor
is powered up, but not performing a measurement or
communicating, it is automatically in idle state (sleep
mode).

MAX44009

Operational at 1uA

BMP180

• STANDBY:0.1uA
• ULTRALOW POWER: 3uA
• STANDARD MODE: 5uA
• PEAK (CONVERSION): 1000uA

CURRENT JUMPER

• In L-15 total current including n-node current
• In L152 n-node current bypasses the switch and the Jumper, so n-nodes current is not meassured