ST integrates window control into door controller IC

January 27, 2012 // By Christoph Hammerschmidt
STMicroelectronics has introduced the market's first multi-functional door-zone driver with an integrated electric-window control. This chip, which reduces bill-of-material costs and improves passenger comfort, has already been selected for broad adoption at a leading German car manufacturer.

Today, equipment manufacturers use relays to drive the electric-window motors. ST's newest door actuator driver redefines the established system topology, removing the need for mechanical relays in car-window control. The device slashes component costs and eliminates expensive electromagnetic compatibility (EMC) countermeasures associated with existing solutions, while offering smoother and quieter car-window operation. ST's new door-zone driver supports adjustable window speeds related to the position of the window - soft start and shutdown - and reduces noise levels with the removal of the relay as well.

The L99DZ80 embeds an SPI-programmable slew-rate control IP that can drive four external MOSFETs in a half-bridge configuration dedicated to PWM (Pulse Width Mode)-driven electric-window applications. Other features include six bridges for double door-lock control, mirror fold, and mirror-axis control, together with a high-side driver for mirror defroster, bulbs and LEDs. The device also integrates a control block with an external MOS transistor for charging and discharging of electrochromic (dimmable) mirror glasses.

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