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Automotive door-zone and rear-window MCU

STMicroelectronics is increasing the integration of automotive body electronics. The L99DZ200G door-zone system IC (integrated circuit) enables a single-chip front-drives-rear setup. It can manage a front-door window, mirror, and lighting as well as the rear-window lift.

Automotive door-zone IC (Source: STM)

According to the company, benefits including lower system quiescent current, greater reliability, faster assembly, reduced bill of materials, and shorter development time are provided.

The MCU (micro-controller unit) contains two H-bridge gate drivers, a gate driver for an external Mosfet to control mirror heating, a control block, and high-side driver for electro-chromic mirror dimming, and five LED high-side drivers. Three of the high-side drivers can operate in constant-current mode to power lighting modules that have high input capacitance. The other two high-side drivers are suitable for controlling ordinary LEDs.

With its two H-bridge drivers, the product can control two spindle motors simultaneously and handle an additional cinch motor to close a powered tailgate or trunk. Both drivers allow operation in generator mode, which activates both low-side Mosfets to protect the device if an overvoltage is detected in the supply rail.

The L99DZ200G also provides power management, with two 5-V low-dropout regulators for the host micro-controller and peripherals. Connections for control and communication include a CAN high-speed transceiver compliant to ISO 11898-2 supporting low-power mode, a LIN 2.2 A transceiver, and an SPI 4.0 interface. The CAN transceiver comes with local failure and network failure as well as HS-CAN Transceiver Conformance Test according to the “interoperability test specification for high-speed CAN transceiver or equivalent devices IOPT.CAN v02d00” by C&S.

Diagnostic and protection features include temperature monitoring and thermal protection, a dedicated failsafe block to pull down the gates of the external high-side Mosfets, and open-load and overcurrent detection for all outputs. A current-monitor output pin is provided for each high-side channel. Overcurrent recovery and thermal expiration allow operation to resume automatically after a fault. There is also reverse-battery protection and system-safety features including a configurable window watchdog and programmable reset generator. AEC-Q100 qualified, the L99DZ200G is in production now, packaged as a 10-mm x 10-mm LQFP64.


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