原标题：Freescale MC12XS3系列12V多路汽车智能灯控制方案

　　freescale公司的MC12XS3系列是12V多路eXtreme高边控制开关,采用SPI控制,具有可编程的多段锁住的过流关断保护特性,工作电压6.0V到20V,8.0MHz 16位3.3V和5.0V SPI控制,智能过流关断,短路和超温保护,主要用于汽车,照明,汽车门,窗提升和座椅控制,引擎控制,工业设备和大功率LED照明.本文介绍了MC12XS3系列产品主要特性,以及MC10XS3412主要特性,框图,典型应用电路, 评估板KIT10XS3412EVBE主要特性和建立框图,电路图,材料清单和PCB元件布局图.

　　The eXtreme Switch Gen 3 12V devices are SPI-Controlled smart high side switches providing diagnostics for the switch, light source and wiring harness, as well as comprehensive fault management and control of the loads without complex software. The devices use a programmable multi-step latched overcurrent shutdown protection.

　　This technique is preferable to the current limit method because it minimizes the thermal stress within the device during an over-load condition, greatly reducing the junction temperature rise and vastly improving reliability. This family is packaged in a PQFN package and a SOICW-EP package. Its low Rdson and large integration enable savings in terms of module size, power dissipation and total system cost.

　　MC12XS3系列产品主要特性:

　　Operating voltage range of 6.0 V to 20 V with sleep current< 5.0 μA, extended mode from 4.0 V to 28 V

　　8.0 MHz 16-bit 3.3 V and 5.0 V SPI control and status reporting with daisy chain capability

　　Smart overcurrent shutdown, severe short-circuit, overtemperature protection with time limited auto retry, and Fail-safe mode in case of MCU damage

　　PWM module with programmable outputs delay management

　　Analog current and temperature feedback with selectable ratio

　　Watchdog and fail-safe management

　　These products are included in Freescale’s product longevity program with assured supply for a minimum of 15 years after launch.

　　MC12XS3系列产品目标应用:

　　Automotive

　　Lighting

　　Doors, Window Lift and Seat Control

　　Gasoline Engine Management

　　Industrial

　　High-Power LED

　　MC12XS3系列产品比较:

　　The 10XS3412 is one in a family of devices designed for low-voltage automotive lighting applications. Its four low RDS(ON) MOSFETs (dual 10 mOhm/dual 12 mOhm) can control four separate 55/28 W bulbs, and/or Xenon modules, and/or LEDs.

　　Programming, control and diagnostics are accomplished using a 16-bit SPI interface. Its output with selectable slew rate improves electromagnetic compatibility (EMC) behavior. Additionally, each output has its own parallel input or SPI control for pulse-width modulation (PWM) control. The 10XS3412 allows the user to program via the SPI the fault current trip levels and duration of acceptable lamp inrush. The device has Fail-safe mode to provide functionality of the outputs in case of MCU damage.

　　MC10XS3412主要特性:

　　•Four protected 10 mohm and 12 mohm high side switches (at 25 °C)

　　•Operating voltage range of 6.0 to 20 V with sleep current < 5.0 A, extended mode from 4.0 to 28 V

　　•8.0 MHz 16-bit 3.3 V and 5.0 V SPI control and status reporting with daisy chain capability

　　•PWM module using external clock or calibratable internal oscillator with programmable outputs delay management

　　•Smart overcurrent shutdown, severe short-circuit, overtemperature protection with time limited autoretry, and Fail-safe mode in case of MCU damage

　　•Output OFF or ON open-load detection compliant to bulbs or LEDs and short to battery detection

　　•Analog current feedback with selectable ratio and board temperature feedback

　　图1.MC10XS3412简化框图

　　图2.MC10XS3412简化应用电路图

　　图3.MC10XS3412典型应用电路图

　　MC10XS3412评估板KIT10XS3412EVBE主要特性:

　　This family of devices is designed for low-voltage automotive lighting applications. Its four low RDS(ON) MOSFETs can control:

　　•Four separate 55W / 28W bulbs

　　•Four separate Xenon modules

　　•Four separate LEDs

　　•Four separate Other type of loads

　　In addition, this family of devices has the following features:

　　•Programming, control, and diagnostics are accomplished using a 16-bit SPI interface.

　　•Its output with selectable slew-rate allows to satisfy electromagnetic compatibility (EMC) requirements.

　　•Each output can be controlled with an internal PWM modulated clock signal, instead of an external clock.

　　图4.评估板KIT10XS3412EVBE外形图

　　图5.评估板KIT10XS3412EVB建立框图

　　评估板KIT10XS3412EVB材料清单(BOM):