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STA381BWS Folha de dados(PDF) 154 Page - STMicroelectronics

Nome de Peças STA381BWS
Descrição Electrónicos  Sound Terminal® 2.1-channel high-efficiency digital audio system
PDF  171 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA381BWS Folha de dados(HTML) 154 Page - STMicroelectronics

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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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