This reference design describes a car High Intensity Discharge (HID) lamp leveling system with a LIN-bus interface. An essential part of the system is a stepper motor controller operating as a LIN-bus slave (LIN Stepper Controller). All functionality is provided by a general purpose LIN-bus IC MM908E625 and LIN Stepper software (HC08 software). The LIN Master consists of a master control board, based on an MC9S12DP256 CPU, and a personal computer with a graphical user interface (GUI), running in a master software environment. The LIN-bus Stepper Controller can be used for any kind of stepper motor control using the LIN-bus serial communication protocol.
View Product Image View Block DiagramFeatures
- LIN bus Interface rev 1.2
- Bus speed 19.2 kbps
- Slave IC without external crystal or resonator
- Slave node clock synchronization ±15%
- Each LIN slave controls one bi-phase bipolar stepper motor
- Motor phase current limitation up to 700 mA
- Supply voltage 12 V d.c.
- Stepper motor control with stepping acceleration and deceleration ramp
- Stepping frequency up to 2,500 Hz
- Slave parameter configuration via LIN-bus
- Slave LIN signal reconfiguration via LIN-bus
- Code written in C-language
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