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Documents HVAC Control Platform Reference Solution: S12G 16-bit MCUs*
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  • Author Author: autoembedded
  • Date Created: 17 Aug 2012 4:13 PM Date Created
  • Last Updated Last Updated: 17 Aug 2012 4:35 PM
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HVAC Control Platform Reference Solution: S12G 16-bit MCUs*

Automotive heating, ventilation and  air conditioning (HVAC) systems are  designed to provide a comfortable cabin  driving environment while minimizing  power consumption and overall load on  the vehicle. This is done by taking inputs  from a variety of sensors, processing  those inputs with an ADC/DAC and  using the data to control different types of motors. For example, stepper and  DC motors are used to control the air  vent flaps while DC and BLDC motors  are used to control the blowers.

 

The  Freescale automotive HVAC control  platform reference solution utilizes  the scalable S12G 16-bit MCU family  along with MC33905, MC33932VW and  MC33937 analog devices to drive each  of these types of motors and leverages  a configurable automatic climate control  software algorithm providing a featurerich solution for automotive HVAC  applications.

 

The automotive HVAC control platform reference solution consists of a central  control board with human-machineinterface (HMI), a motor control board,  flap and blower motors. It enables  the basic functions of an automotive  HVAC system using temperature,  light, humidity and air quality sense  interfaces together with the configurable  automatic climate control software  algorithm to more efficiently control the  vehicle climate. The LCD controlled by  the S08LG MCU (optional) can display  rich content for the driver including  temperature, wind speed and calendar. This reference solution will reduce  the overall R&D effort for customers,shorten overall time to market and  can be tailored for both 12 and 24 V  automotive HVAC systems.

 

The S12G MCU is the core controller  of this reference solution, offering 16 to  240 KB of flash and 20, 32, 48, 64, to  100 pin count, with full pin compatibility  and maximums module reuse within the  family. EEPROM on board and multiple  peripheral interfaces such as CAN and  LIN/SCI communications to link the  main control system with the distributed  motor units, SPI for analog connections  and PWM signal control makes the  S12G MCU ideal for automotive HVAC  applications.

 

image

S12G MCU Key Features

  • S12 CPU core, 25 MHz bus
  • Up to 240 KB on-chip flash with ECC
  • Up to 4 KB EEPROM with ECC
  • Up to 11 KB on-chip SRAM
  • Up to one multi-scalable controller area network (MSCAN) module
  • Supporting CAN protocol 2.0 A/B
  • Up to three serial communication interface modules, supporting LIN communications
  • Up to three serial peripheral interface modules
  • Precision fixed voltage reference for analog-to-digital conversion
  • 1 MHz internal oscillator
  • On-chip voltage regulator for input supply and internal voltages
  • This product is included in the Freescale Product Longevity program, with assured  supply for a minimum of 15 years after launch
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  • 16bit
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  • dc_motor
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  • air_conditioning
  • automotive
  • mcu
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