原标题：ST L99UDL01汽车通用门锁解决方案

　　ST公司的L99UDL01是汽车通用门锁集成电路,有六个输出的多个半桥集成电路,是PWM可配置和电流稳流的,对于更高电流节点有多达两个外部可配置的半桥.诊断功能包括开路,对电池短路,对地短路以及通过10位电流反馈的负载完整性.L99UDL01满足AEC-Q100汽车规范,PWM电流调整高达25kHz,4MHz 24位SPI接口用来控制和诊断,输出具有高度安全性,热告警和关断保护,采用外接N沟MOSFET进行反向电池保护,主要用在汽车中央门锁系统的驱动门锁激励器.本文介绍了L99UDL01主要特性,框图,典型应用案例和评估板EVAL-L99UDL01主要特性,应用框图,主板和子板电路图,PCB设计图.

　　The L99UDL01 is a multiple half-bridge IC with 6 integrated outputs that are PWM configurable and current regulated and up to two externally configured half bridges for higher current nodes. The level of diagnostics includes open load, short to battery, short to ground, and load integrity via 10 bit current feedback.

　　The L99UDL01 is commanded entirely by SPI using duration and current level commands.

　　L99UDL01主要特性:

　　AEC-Q100 qualified 

　　Six integrated fully protected 0.09  half bridges 

　　Integrated half bridges can be fully independent or paralleled up to three in parallel Two levels of standby

　　– Standby (SPI initiated)

　　– Sleep (VDD=0 V) 

　　Very low current consumption in standby

　　– Only wake-up circuit active 

　　High level of programmability

　　– On-time duration

　　– Direction

　　– Current level

　　– Off-state fault detection 

　　2 external half bridge controllers (using external N-channel MOSFETs or Smart Power devices)

　　External half bridges protected by drain source monitoring and off-state fault detection 2 stage charge pump for low voltage operation 

　　PWM current regulation up to 25 kHz 

　　4 MHz 24 bit SPI interface for control and diagnostics 

　　Output enable for high security

　　High level diagnostics 

　　10 bit digital current feedback (via SPI) for load integrity check 

　　Thermal warning and shutdown protection 

　　Reverse battery protection using an external N-Ch MOSFET. 

　　TQFP64L exposed pad package

　　L99UDL01应用:

　　The L99UDL01 is designed for use in a central door lock system driving all of the door lock actuators. This device is able to adapt to most central door lock configurations

　　图1. L99UDL01框图

　　图2. L99UDL01典型应用案例

　　评估板EVAL-L99UDL01

　　The EVAL-L99UDL01 evaluation board is designed to demonstrate the centralized control of all the locks available in a car by means of the L99UDL01 device. The board is composed by a motherboard and a daughterboard. The motherboard, which is based on the SPC560B54 microcontroller, provides the logic section for monitoring and driving the L99UDL01 device assembled on the daughterboard.

　　With the aim of facilitating the use and configuration of the board, STMicroelectronics provides a dedicated user-friendly software with a graphic user interface (GUI). This GUI enables the user to set the L99UDL01 control parameters and at the same time shows real time diagnostics information as current output and battery voltage monitoring.

　　评估板EVAL-L99UDL01主要特性:

　　• Board functionality based on L99UDL01, universal door lock for automotiveapplications:

　　– 6 integrated fully protected 0.09 Ω half bridges

　　– PWM current regulation up to 25 kHz

　　– integrated half bridges can be fully independent or paralleled up to three inparallel

　　– 2 stage charge pump for low-voltage operation

　　– 2 external half-bridge drivers

　　– 10-bit digital current feedback (via SPI) for load integrity check

　　– TQFP64L exposed pad package

　　• Board reverse battery protection with STD95N4F3 Power MOSFET

　　• Input operating voltage range through mother board connector: from 6 V to 26 Vfor microcontroller powered by 5V LDO motherboard; from 6 V to 18 V formicrocontroller powered by 3.3V LDO motherboard

　　• Output current up to 24 A DC

　　• Motherboard size: 144 mm length x 81 mm width

　　• Daughterboard size: 113.4 mm length x 69.7 mm

　　• All ST components are automotive-grade qualified

　　•The referenced device L99UDL01 can be adapted to most central door lockconfigurations.

　　评估板EVAL-L99UDL01应用:

　　• Central door lock systems from body control modules driving all door lockActuators

　　图3.评估板EVAL-L99UDL01主板外形图

　　图4.评估板EVAL-L99UDL01子板外形图

　　图5.评估板EVAL-L99UDL01应用框图