===============================================================================
  Temperature Sensor & Vrefint (Voltage Reference internal) management functions
 ===============================================================================  

  This section provides functions allowing to enable/ disable the internal 
  connections between the ADC and the Temperature Sensor and the Vrefint source.
     
  A typical configuration to get the Temperature sensor or/and Vrefint channels 
  voltages is done following these steps :
   1. Enable the internal connection of Temperature sensor or/and Vrefint sources 
      with the ADC channels: 
      - for the Temperature sensor using ADC_TempSensorCmd() function.
      - for the Internal Voltage reference using ADC_VrefintCmd() function. 
   2. Enable the ADC_Channel_TempSensor and/or ADC_Channel_Vrefint channels 
      using ADC_ChannelCmd()function. 
   3. Get the voltage values, using ADC_GetConversionValue().