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This page is a page that summarizes FAQs about A2B for each category.
Overview
- What are the functional differences between the AD2428W and other common RS485 transceivers?
- Please tell me about the connection configuration of the AD2428W. (multidrop, star connection, etc.)
- Analog Devices Automotive Audio Bus (A2B): Tell me about the connectable length (connection distance) of the AD2428W.
- Does the AD2428W support hot swapping?
- Why does the AD2428W use twisted pair cables?
- Are there any specifications for cables and connectors for the AD2428W?
- What is the difference between BPS and PPS in the AD2428W?
- Does the AD2428W have to undergo certification testing like HDMI?
- Can the AD2428W transmit high resolution audio?
- Please tell me about the AD2428W evaluation board.
function
- Where are the operating clocks (I2S, internal operating clocks, etc.) for the AD2428W made?
- Please tell me about the I2S transmission delay time of the AD2428W.
- How long does it take for the PLL to lock on the AD2428W? Or what is the maximum A2B transceiver PLL lock time?
- How do I reset the AD2428W?
- Tell me about the EMC performance of the AD2428W.
- How many PDM microphones can be connected to the A2B transceiver on the AD2428W?
- Is there a way to write the same data to all slave nodes at once in the AD2428W?
circuit
- Are there any peripheral circuits required for the AD2428W?
- Are there any points to consider when designing the board for the AD2428W?
- Please tell me about the termination slave of AD2428W. Do the end nodes of the daisy chain require terminal looping?
- Please tell me about the slave node configuration of AD2428W. Do I need an external Codec if I want to use analog mics instead of PDM mics?
- What is the state of the GPIO pins of the AD2428W during RESET?
power supply
- Please tell me about the AD2428W bus power supply.
- Please tell me about the voltage of the internal power supply of AD2428W. Why is VOUT1 1.9V? Isn't it 1.8V which is a more typical value?
- Please tell me about the power supply for the AD2428W. Is it possible to supply DVDD, PLLVDD, IOVVDD, etc. externally?
- Are there any "slew rate" specifications for the various power input pins (IOVDD, VIN, etc.) of the AD2428W?
- Are there any regulations for "ripple noise" on the various power supply input pins (IOVDD, VIN, etc.) of the D2428W?
- Can the internal regulator output of the AD2428W be supplied externally?
- Can the IOVDD pin of the AD2428W be supplied externally?
- How many mA will the AD2428W's IOVDD pin consume?
- Which block is the AD2428W's IOVDD supplied to?
- Please tell me about the power-on sequence when supplying IOVDD from an external power supply for the AD2428W.
- Please tell me about the power-off sequence when supplying IOVDD from an external power supply in the AD2428W.
- Please let me know what to do if there is a momentary power failure or brownout (interrupted voltage supply below the operating voltage) in the AD2428W power supply.
- Is the max 300mA guaranteed value for the AD2428W "Negative Bias Switch" current IVSSN? Is there a possibility that it will fall below 300mA due to device variations?
I2C communication
- In AD2428W, which version of the I2C specification is compatible with the on-board I2C interface?
- In the AD2428W, does the built-in I2C interface have the drive capability according to the I2C specifications?
- Can the AD2428W select any I2C address?
- I have a question about the I2C interface implemented on the AD2428W. If there is no clock stretching function on the host MCU side, is there an alternative?
- I have a question about the I2C interface implemented on the AD2428W. Is 400kHz communication possible without initialization for I2C communication between host MCU and master node A2B?
- Does the AD2428W have target address restrictions for "external I2C devices" that connect to slave nodes?
- In the AD2428W, how is the "A2B device register" implemented in the slave node distinguished from the "external I2C device register"?
- Are there any time constraints on accessing the "external I2C device" that connects to the AD2428W slave node?
Initialization process
- There are multiple discovery flows listed in the TRM (Technical Reference Manual) for the AD2428W. Which discovery flow is recommended?
- Please tell me about initial setting of AD2428W. How long does system initialization take?
- Please tell me about initial setting of AD2428W. Is it possible to initialize from the slave MCU?
- Is the cable length also a factor in calculating the response cycle (RESPCYCS) in the AD2428W?
error handling
- Please tell me about error handling in AD2428.
- What is the recovery when AD2428 communication error occurs?
- What happens if the AD2428W keeps getting CRC errors?
- Please let me know the recovery condition of the master device (AD2428W) when the SYNC of the I2S signal from the HOST to the master device (AD2428W) stops during operation of the AD2428W.
If the problem persists
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