GenevaSTMicroelectronics is sampling a chip that produces the major signals required to drive vehicle door-mounted systems as well as an improved method for controlling electrochrome (EC) rear-view mirrors. The L99DZ70XP combined driver IC eliminates discrete drivers normally mounted in multiple locations inside the door, allowing compact, integrated door-zone controllers that are easier to fit and deliver greater long-term reliability.
Conventional EC controllers typically use a regulator that requires a high-power external resistor, but the L99DZ70XP generates control signals for a small external MOSFET driving the EC element. This saves space and cost, and also allows closed-loop current control for enhanced reliability.
Six of the L99DZ70XP outputs are optimized for motor-drive applications such as mirror positioning and folding, and door-lock actuation. Up to four drivers are available for lighting applications, and two of these can be programmed to drive either LEDs or conventional bulbs. Another output is optimized to drive the mirror defroster. Each of the drivers uses pulse-width modulation for accurate current control. Other capabilities include soft starting for loads such as motors or bulbs, to prevent high initial currents causing potentially damaging surges within the vehicle wiring.
The L99DZ70XP uses serial communications over an industry-standard SPI link to exchange information with the host controller, including diagnostic information for each output to aid fault-finding and repair.
Pricing: $3 for 100,000 pieces.
Availability: Samples are available immediately, with volume production scheduled for Q1 2009.
Datasheet: Click here.