Automotive door-zone controllers merge PMIC, failsafe functions
L99DZ100G/GP for front-door applications and L99DZ120 for rear-door controls enable designers to save space as well as boost reliability and energy efficiency and offer software compatibility between the family members.
Both front-door controller variants integrate MOSFET Half-bridges for driving up to five DC motors and can also drive an external H-bridge. In addition, there are eight LED drivers and a further two drivers for bulbs, a gate driver for a mirror heater, and a control module for electro-chrome glass. Voltage regulators for external circuitry such as a microcontroller and sensors, as well as associated timers, watchdogs, reset generators, and protection are also provided. The L99DZ120 contains similar features, tailored to requirements for rear doors, including motor drivers for electric windows.
ST builds the parts in its proprietary BCD8S automotive technology to meet power-management and failsafe demands in door-zone applications with features that include embedded half-bridge and high-side drivers up to current ratings of 7.5A. There are also High-Speed CAN (HS-CAN) and LIN 2.2a (SAE J 2602) interfaces, control blocks, and protection circuitry. The L99DZ100GP adds support for ISO 11898-6 HS-CAN selective wake-up that maximizes energy savings by allowing infrequently-used Electronic Control Units (ECU) to remain powered down while connected to the CAN bus.
Features include automatic LED duty-cycle compensation to ensure consistent brightness as the vehicle supply-voltage (VS) fluctuates. Thermal clusters allow outputs to be disabled individually if an event such as a short-circuit occurs. This enables unaffected outputs to operate normally. Packaging is in LQFP64.
ST; www.st.com/l99dz1-ns;
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