Window Lifter Solution Based on ST STMicroelectronics L99H92

The main objective of the AEK-MOT-WINH92 solution is to drive the DC motor of an automotive window lifter, ensuring a high level of safety.

The board perfectly fits the automotive market trend towards window lift applications by providing a new anti-pinch mechanism that does not require the use of a motor encoder, but instead utilizes the board's three different types of motor response (series, low side and high side).

The board can be configured for use with a single H-bridge for a bi-directional DC motor, or two independent half-bridges for two uni-directional DC motors.

Due to its compact size, the board can be easily connected to any microcontroller, utilizing separate dedicated connectors for SPI communication, current response and basic motor command interface with fault detection. Another key feature is the adjustable gain for anti-pinch and to meet any window operating conditions (the current range level may change when the window is opened in adverse weather conditions, such as ice).

The board also provides three diagnostic functions for detecting potential ground shorts, battery shorts, and open loads when the device is off.

If a fault occurs, the DIAG pin sends an alarm to the external MCU to ensure timely handling of open loads, shorted grounds and shorted batteries, thermal warnings and overheat shutdowns, under/overvoltage and overcurrent protection. A fail-safe button has been added to the board layout for system debugging during the development phase.

Reverse polarity protection has been implemented to provide strong protection for the board and to prevent damage caused by reverse power polarity.

Four external MOSFETs allow currents of up to 50 A, in line with the board's power consumption capabilities.

The board design is based on the L99H92 H-bridge gate driver for automotive applications, which has a flexible electrical response that provides a different tool for the development of advanced anti-pinch algorithms. For systems requiring a higher level of security, you can enable a watchdog with a programmable time window.

The AutoDevkit ecosystem provides a wide range of demos and drivers for the SPC58 microcontrollers, providing quick access to board usage to facilitate your application design:

1) SPC582Bxx_RLA - AEK_MOT_WINH92 Test application for discovery, downloadable to the SPC582B on the AEK-MCU-C1MLIT1 MCU board;

2) SPC584Bxx_RLA - the test application used by AEK_MOT_WINH92 for discovery can be downloaded onto the SPC584B on the SPC584B-DIS discovery board;

3) SPC58ECxx_RLA - AEK_MOT_WINH92 test application for full bridge, downloadable to SPC58EC on the AEK-MCU-C4MLIT1 MCU board;

4) SPC58ECxx_RLA - AEK_MOT_WINH92 Dual Half Bridge test application, downloadable to the SPC58EC on the AEK-MCU-C4MLIT1 MCU board;

5) SPC58xNxx_RLA - AEK_MOT_WINH92 test application for discovery, available for reference in AutoDevKit Studio;

6) SPC58ECxx_RLA - AEK_MOT_WINH92 window up/down test application, which can be downloaded to the SPC58EC on the AEK-MCU-C4MLIT1 MCU board.

The first five demonstrations show how to configure the AEK-MOT-WINH92 to drive either a bi-directional (full-bridge configuration) or two uni-directional (half-bridge configuration, e.g., fuel and water pumps) DC motors and change the PWM duty cycle signal.

The last demonstration shows how to configure the AEK-MOT-WINH92 for a window lift application.

►Scene application diagram

►Panel photo

►Solution Block Diagram

►Core Technology Advantages

1、Simple material

2、Safety mechanism and protection function

3、Flexible use: three different types of flu response (series, low side and high side), full-bridge, dual half-bridge + flu test

4、Adjustable gain, for anti-pinch and meet any window operating conditions

5、Multiple applications to choose from, to speed up the completion of the assessment

►Program Specifications

Motor drive up to 50 A

• - Clip detection facilitated by programmable gain motor response
• - Inline, low and high side current detection options
• - Diagnostic pins alert the microcontroller to faults, avoiding cyclic on-demand

Fault checking via SPI ensures timely intervention

• - Dedicated circuitry for reverse battery protection

Fault detection capability:

• - Open load, shorted ground and shorted battery conditions.
• - Thermal warning and thermal shutdown
• - Under/over voltage protection
• - Overcurrent protection

Low component count

L99H92 H-bridge gate driver for DC automotive applications

Compact size: 103 mm x 80 mm

Included in AutoDevkit ecosystem

L99H92Q5-TR

STMicroelectronics NV

3~7 天

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