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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STA381BWS датащи(PDF) 154 Page - STMicroelectronics |
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STA381BWS датащи(HTML) 154 Page - STMicroelectronics |
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154 / 171 page  Register description: Sound Terminal compatibility STA381BWS 154/171 Doc ID 018937 Rev 6 7.23 Bad PWM detection registers (address 0x4D, 0x4E, 0x4F) The STA381BWS implements a detection on the PWM outputs able to verify if the output signal has no zero-crossing in a configurable time window. This check can be useful to detect DC levels in the PWM outputs. To be noted that the checks are performed on logic level PWM (i.e. not the power bridge ones, nor the PWM on DDX3 and DDX4 I/Os). In case of ternary modulation, the detection threshold is computed as: TH=[(BPTH*2+1)/128]*100% If the measured PWM duty cycle is detected greater than or equal to TH for more than BPTIM PWM periods, the corresponding PWM bit will be set in register 0x4E. In case of binary modulation, there are two thresholds: TH1=[(64+BPTH)/128]*100% TH2=[(64-BPTH)/128]*100% In this case if the measured PWM duty cycle is outside the TH1-TH2 range for more than BPTIM PWM periods, the corresponding bit will be set in register 0x4E. D7 D6 D5 D4 D3 D2 D1 D0 BPTH[5] BPTH[4] BPTH[3] BPTH[2] BPTH[1] BPTH[0] reserved reserved 00 11 00 1 0 D7 D6 D5 D4 D3 D2 D1 D0 BP4B BP4A BP3B BP3A BP2B BP2A BP1B BP1A 00 00 00 0 0 D7 D6 D5 D4 D3 D2 D1 D0 BPTIM[7] BPTIM[6] BPTIM[5] BPTIM[4] BPTIM[3] BPTIM[2] BPTIM[1] BPTIM[0] 01 01 11 1 0 |
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