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Door module drivers

door zoneSTMicroelectronics has designed a group of actuator drivers to address all automotive door-zone applications for the multiplicity of door-electronics variants today. They are characterized by a scalable-actuator driving concept compatible with package and software.
The drivers support all regular door-zone loads such as door-lock motors, mirror folders and leveling, defroster and lighting functions from LEDs to incandescent bulbs.
The power-management system device enables applications to achieve a very low quiescent current. Control and diagnostics for all devices are managed via a serial peripheral interface (SPI).
ST’s actuator drivers are available in small power packages, offering superior thermal performance – ideal for compact and lightweight systems.

The car-body door actuator family housed in the same packages (PowerSO-36 and PowerSSO-36) is pin-to-pin compatible, therefore targeting different market segments.
This provides a real family approach since project designers can consider one option or another, without any further change on the board.

door zone

Power management: L9952 - the new solution

L9952

L9952 features:

Operating voltage range:
Output 1   5 V/200 mA
Output 2  5 V/50 mA

  • Low standby current
  • 5 µA off/30 µA V1 standby
  • Window watchdog
  • Fail-safe output
  • Wake-up logic with cyclic contact monitoring
  • PWM inputs
  • Embedded LIN-transceiver
  • SPI for mode control and diagnosis
  • 4 x 10 Ω high-side driver for LED or Hall-sensor supply
  • 1 x 1 Ω high-side driver
  • 2 x low-side relay driver
  • All outputs protected
  • 2 op amps for current sensing
  • Over temperature flag
  • Thermal shut-down
  • Package: PowerSSO-36 

Actuator driver: L9950XP - the master device

L9950XP

L9950XP Features

  • Operating supply voltage: 7 V to 26 V
  • Transient up to 40 V
  • Mirror central   300 mohm (25 °C)
  • Mirror adjust    800 mohm (25 °C)
  • Mirror adjust    800 mohm (25 °C)
  • Lock                 150 mohm (25 °C)
  • Dead bolt         300 mohm (25 °C)
  • Lock central               150 mohm (25 °C)
  • Defroster         100 mohm (25 °C)
  • Turn indicator    800 mohm (25 °C)
  • Safety light       800 mohm (25 °C)
  • Footwell light   800 mohm (25 °C)
  • Exterior light     800 mohm (25 °C)
  • Current sense for locks and defroster
  • SPI for data communication
  • 2 PWM inputs for lamp dimming
  • Gate supply for reverse polarity MOSFET
  • Short-circuit/thermal protection
  • Overload/open-load diagnostics
  • Quiescent current typ 4 µA (Vcc is off)
  • Over temperature warning flag
  • Package: PowerSO-36 / PowerSSO-3
 
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