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STA3398 Datasheet(PDF) 62 Page - STMicroelectronics |
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STA3398 Datasheet(HTML) 62 Page - STMicroelectronics |
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62 / 77 page  Register description STA339BW 62/77 Doc ID 15251 Rev 5 6.12.21 Overcurrent postscale The STA339BW provides a simple mechanism for reacting to overcurrent detection in the power block. When the ocwarn input is asserted, the overcurrent postscale value is used in place of the normal postscale value to provide output attenuation on all channels. The default setting provides 3 dB of output attenuation when ocwarn is asserted. The amount of attenuation to be applied in this situation can be adjusted by modifying the Overcurrent postscale value. As with the normal postscale, this scaling value is a 24-bit signed fractional multiplier, with 0x800000 = -1 and 0x7FFFFF = 0.9999998808. By default, the overcurrent postscale factor is set to 0x5A9DF7. Once the overcurrent attenuation is applied, it remains until the device is reset. Table 72. RAM block for biquads, mixing, scaling and bass management Index (decimal) Index (hex) RAM block setting Coefficient Default 0 0x00 Channel 1 - Biquad 1 C1H10(b1/2) 0x000000 1 0x01 C1H11(b2) 0x000000 2 0x02 C1H12(a1/2) 0x000000 3 0x03 C1H13(a2) 0x000000 4 0x04 C1H14(b0/2) 0x400000 5 0x05 Channel 1 - Biquad 2 C1H20 0x000000 …… … … … 19 0x13 Channel 1 - Biquad 4 C1H44 0x400000 20 0x14 Channel 2 - Biquad 1 C2H10 0x000000 21 0x15 C2H11 0x000000 …… … … … 39 0x27 Channel 2 - Biquad 4 C2H44 0x400000 40 0x28 Channel 1/2 - Biquad 5 for XO = 000 High-pass 2nd order filter for XO ≠000 C12H0(b1/2) 0x000000 41 0x29 C12H1(b2) 0x000000 42 0x2A C12H2(a1/2) 0x000000 43 0x2B C12H3(a2) 0x000000 44 0x2C C12H4(b0/2) 0x400000 45 0x2D Channel 3 - Biquad for XO = 000 Low-pass 2nd order filter for XO ≠000 C3H0(b1/2) 0x000000 46 0x2E C3H1(b2) 0x000000 47 0x2F C3H2(a1/2) 0x000000 48 0x30 C3H3(a2) 0x000000 49 0x31 C3H4(b0/2) 0x400000 50 0x32 Channel 1 - Prescale C1PreS 0x7FFFFF 51 0x33 Channel 2 - Prescale C2PreS 0x7FFFFF 52 0x34 Channel 1 - Postscale C1PstS 0x7FFFFF 53 0x35 Channel 2 - Postscale C2PstS 0x7FFFFF |
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