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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST92196A датащи(PDF) 212 Page - STMicroelectronics |
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ST92196A датащи(HTML) 212 Page - STMicroelectronics |
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212 / 268 page  212/268 - VOLTAGE SYNTHESIS TUNING CONVERTER (VS) VOLTAGE SYNTHESIS (Cont’d) BRM Generation The BRM bits allow the addition of a pulse to wid- en a standard PWM pulse for specific PWM cy- cles. This has the effect of “fine-tuning” the PWM Duty cycle (without modifying the base duty cycle), thus, with the external filtering, providing additional fine voltage steps. The incremental pulses (with duration of TINTCLK/ 4) are added to the beginning of the original PWM pulse and thus cause the PWM high time to be ex- tended by this time with a corresponding reduction in the low time. The PWM intervals which are add- ed to are specified in the lower 7 bits of the tuning word and are encoded as shown in the following table. Table 44. 7-Bit BRM Pulse Addition Positions The BRM values shown may be combined togeth- er to provide a summation of the incremental pulse intervals specified. The pulse increment corresponds to the PWM res- olution. Figure 94. Simplified Filtered Voltage Output Schematic with BRM added Fine Tuning No. of Pulses added at the following Cycles 0000001 64 0000010 32, 96 0000100 16, 48, 80, 112 0001000 8, 24,... 104, 120 0010000 4, 12,... 116, 124 0100000 2, 6,... 122, 126 1000000 1, 3,... 125, 127 VDD PWMOUT 0V VDD OUTPUT VOLTAGE 0V BRM = 1 BRM = 0 T INTCLK/4 BRM EXTENDED PULSE == = |
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