Software Design

 

 

 

 

 

22.

#define

MIN_IGNITION_FREQ

 

45

 

 

...defines the minimum HRP frequency in kHz.

23.

#define

MAX2PREHEAT_RAMP

 

100

 

 

...represents the number of frequency steps between the maximum HRP frequency and the

 

preheat HRP frequency.

 

2000

 

24.

#define

IGNITION_RAMP

 

 

 

...represents the number of frequency steps between preheat HRP frequency and ignition HRP

 

frequency.

MIN_RUN_HRP_FREQ

 

50

/*see DLB_setup.xls */

25.

#define

 

 

...defines the minimum HRP frequency in kHz during run mode.

26.

#define

MAX_RUN_HRP_FREQ

 

100

/*see DLB_setup.xls */

 

...defines the maximum HRP frequency in kHz during run mode.

27.

#define

TUBE_CURR_MIN

 

10

/*see DLB_setup.xls */

 

...represents the minimum tube current.

 

/*see DLB_setup.xls */

28.

#define

TUBE_CURR_MAX

 

245

 

 

...represents the maximum tube current.

 

 

29.

#define

CURRFLT_MS

100

 

 

 

...sets the zero current checking interval in ms.

30.

#define

CURRFLT_CNT

3

 

 

 

 

...represents the number of fault states during run mode.

31.

#define

INGITION_CNT

 

3

 

 

 

...represents the number of fault states during tube ignition.

32.

#define

ADDMINITERVAL

 

100

 

 

 

...represents the interval of dimming value measurement in ms.

33.

#define

UC_REQUIRED_AN

 

390L

 

 

...represents the required DC-bus voltage in V.

34.

#define

UC_ALLOWED_MIN_AN

 

290L

 

...represents the minimum allowed DC-bus voltage in V.

35.

#define

UC_ALLOWED_MAX_AN

 

450L

 

...defines the maximum allowed DC-bus voltage in V.

36.

#define

UC_MAX_VAL_AN

 

458L

 

 

...represents the maximum value of the DC-bus voltage in V.

37.

#define

UC_START_PREHEAT_AN

 

370L

 

...represents the preheat DC-bus voltage in V.

38.

#define

UC_START_CYCLES_MAX

 

50

 

...represents the interval in ms in which the DC-bus voltage must reach the required value.

39.

#define

UC_START_RAMP_STEPS

 

30

 

...represents the number of steps needed to reach the DC-bus required value from the zero value.

40.

#define

PI_KP_START

10

 

 

 

...represents the proportional gain of the PI PFC stage regulator in the start phase.

41.

#define

PI_KI_START

3

 

 

 

 

...represents the integral gain of the PI PFC stage regulator in the start phase.

42.

#define

PI_KP_RUN

2

 

 

 

 

...represents the proportional gain of the PI PFC stage regulator in run mode.

43.

#define

PI_KI_RUN

1

 

 

 

 

 

Dimmable Light Ballast with Power Factor Correction, Rev. 1

 

 

 

 

 

 

 

54

 

 

 

 

 

Freescale Semiconductor

Page 54
Image 54
Freescale Semiconductor M68HC08 Preheat HRP frequency, Frequency, Defines the minimum HRP frequency in kHz during run mode

M68HC08 specifications

Freescale Semiconductor, known for its innovative solutions in the field of embedded systems, developed the M68HC08 microcontroller family, which includes the MC68HC908QT2. This 8-bit microcontroller is engineered to meet the demands of diverse applications, including automotive, industrial, and consumer electronics.

The MC68HC908QT2 is designed around Freescale’s M68HC08 core, which is renowned for its efficient and reliable performance. This microcontroller integrates a powerful instruction set, enabling developers to create high-performance applications with relatively low power consumption. The device operates at a clock frequency of up to 3 MHz, which is adequate for various control tasks.

One of the key features of the MC68HC908QT2 is its memory architecture. It includes a 2 KB Flash memory for program storage, representing a significant advantage for developers requiring non-volatile memory. Additionally, it encompasses 128 bytes of EEPROM memory, allowing for data retention even after power loss. The microcontroller also has 256 bytes of RAM for efficient data manipulation during operation.

In terms of input/output capabilities, the MC68HC908QT2 supports a variety of interfacing options. The microcontroller features up to 20 general-purpose I/O pins for flexibility in connecting with peripheral devices. Additionally, it provides multiple analog-to-digital converters (ADC) and timers that facilitate efficient analog signal processing and precise control through timing functions.

The architecture of the MC68HC908QT2 also incorporates sophisticated on-chip peripherals, enhancing its functionality. These peripherals include PWM (Pulse Width Modulation) outputs, which are essential for applications requiring motor control and other precise duty cycle processes. The integrated watchdog timer ensures reliable operation by resetting the system in the event of an application failure.

Moreover, the MC68HC908QT2 is equipped with an efficient power management system, enabling operation in a low-power mode, ideal for battery-powered applications. This microcontroller is packaged in a compact 28-pin dual in-line package (DIP), making it suitable for space-constrained designs.

In summary, the Freescale Semiconductor MC68HC908QT2 microcontroller is distinguished by its robust performance, extensive memory options, and versatile I/O capabilities. Its advanced features, including built-in timers, ADC, and a power management system, make it an exceptional choice for developers seeking to implement reliable and efficient embedded solutions. With its comprehensive architecture, the MC68HC908QT2 remains a popular choice in the landscape of 8-bit microcontrollers.