TAS5715
SLOS645 –AUGUST 2010
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PWM DC Detection
The TAS5715 supports a PWM dc-detect function. This is to detect dc present in the input source and generated
by another means in the blocks prior to PCM-to-PWM conversion.
If enabled (0x46, bit 10), the detection block checks for PWM duty cycle. If it is above the programmed threshold
(0x0F, bits 7–4]) for more than the programmed duration of time (0x0F, bits 3–0), the PWM dc error flag is set on
error register 0x02, bit 0.
This bit is set as long as the dc condition remains. Once the dc condition is gone, the bit is cleared automatically.
The bit is cleared if detection is disabled.
Biquad Corruption Control
The TAS5715 supports this function to prevent issues when a biquad value is corrupted due an error in the I2C
line while updating biquads. The system controller writes a checksum for the biquads into the checksum register.
Once the EQ CRC detect function is enabled (0x46, bit 25), the TAS5715 periodically calculates a checksum for
biquads in DAP memory and compare it with the expected checksum. If an error occurs, then the crc error flag is
set in register 0x02, bit 3.
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