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| AK4128A |
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37 page 
[AK4128A] MS1242-E-00 2010/09 - 37 - ■ Internal Status Pin The UNLOCK pin indicates internal status of the device. This pin outputs “H” when the PDN pin = “L”. SRC data is output from SDTO1-4 pins, which corresponds to the each sampling frequency ratio detected SRC, after a rising edge “↑” of PDN if the internal regulator is in normal operation. In 8-channel mode, the UNLOCK pin outputs “L” when sampling frequency ratio detection is completed at all SRC’s (SRC1-4). The UNLOCK pin keeps outputting “H” if there is one SRC which does not finished sampling frequency ratio detection. In 6-channel mode, the UNLOCK pin outputs “L” when sampling frequency ratio detection is completed at SRC1-3. It keeps outputting “H” if there is one SRC which does not finish sampling frequency ratio detection. In 4-channel mode, the UNLOCK pin outputs “L” when sampling frequency ratio detection is completed at SRC1-2. It keeps outputting “H” if there is one SRC which does not finish sampling frequency ratio detection. When over-current/voltage is flowed at the internal regulator, the UNLCOK pin outputs “H”. An OR’ed result of the flags between over-current/voltage detection at the internal regulator and SRC sampling frequency detection complete is output from this pin. Figure 38. Internal Flags and UNLOCK pin Output In parallel control mode, if the AK4128A is set in SRC bypass mode by CM2-0 pins during the PDN pin = “L” and powered-up, the UNLOCK pin outputs “L” after the power-up time of the internal regulator (max. 1.4ms) from a rising edge “↑” of the PDN pin. In serial control mode, if BYPS bit is set to “1”while RSTN bit = “0”, the UNLOCK pin immediately outputs “L” after the register writing. Over-Current/Voltage Limit Flag (“L” Normal, “H” Over-Current/Voltage detect) SRC Sampling Frequency Ratio Complete Flag UNLOCK pin |
