Door zone controllers get fail-safe
Integrated power management and fail-safe circuits make the difference for STMicroelectronics’ controller chips for car doors – the L99DZ100G / GP for front door applications and the L99DZ120 for the rear doors. The devices integrate features that previously required the use of external components.
The new chips help designers to save space while improving reliability and energy efficiency. With the additional advantage of software compatibility between the different members of the family, the building blocks also contribute to a simpler development and to shorten the market introduction time.
The advanced proprietary automotive technology BCD8S from ST is playing a key role in the realization of this single-chip solution. With a variety of features, including built-in half-bridge and high-side drivers for currents up to 7.5A, the solution meets the power management and fail-safe requirements of door zone applications. It also offers high-speed CAN (HS-CAN) and LIN 2.2a interfaces (SAE J 2602), control blocks and protective circuits. The L99DZ100GP offers additional support for selective wake-up according to ISO 11898-6 HS-CAN, thus ensuring maximum energy savings as rarely used ECUs can be put to sleep mode while they are connected to the CAN bus.
Both controller versions for front doors contain integrated MOSFET half-bridges, which can drive up to five DC motors and an external H-bridge. In addition, there are eight LED drivers and two incandescent lamp drivers, a gate driver for a mirror heater and a control module for electrochromic glass. Voltage regulators for external circuits such as a microcontroller and sensors as well as the associated timers, watchdogs, reset generators and protective functions are also included in the equipment range. The L99DZ120, designed for the rear doors, also offers similar functions, such as motor drivers for electric window lifters.
Other features include the automatic LED duty-cycle compensation, which ensures uniform brightness even when the vehicle voltage fluctuates. Innovative thermal clusters also allow you to disable individual outputs when an event such as a short circuit occurs. Unaffected outputs remain functional in this case.
More information: www.st.com/l99dz1ns .
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