ML22Q533 datasheet(173/178 Pages) ROHM

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FEDL22Q53X-02

ML22Q53X

■Function description

●I2C interface (Slave)

[ ] When I2C is used, be sure to insert a pull-up resistor between SCL and SDA pins and DVDD pin.

◆Command flow when reading data

[ ] The data to be read is updated by inputting RDSTAT/RDERR/RDVER command. Be sure to enter the

RDSTAT/RDERR/RDVER command before reading the internal status.

●SAI(Serial Audio Interface)

[ ] To use SAI, use AMODE commands to place the SAI into the analog power-up status.

●Mixing function

◆Restrictions when using Serial Audio Interface(SAI)

[ ] When the serial audio interface (SAI) is used, there are some limitations to the maximum number of mixing and

playable channels depending on the sampling frequency.

[ ] When mixing at the sampling frequencies of 8.0/16.0/32.0kHz with using Serial Audio Interface(SAI), HQ-ADPCM

cannot be used.

◆Waveform clamp precautions for mixing

[ ] If the clamp is known to be generated in advance, adjust the volume of each channel by CVOL and PAN commands.

◆Different sampling frequency mixing algorithm

[ ] It is not possible to perform channel mixing by a different sampling frequency group.Note that when channel synthesis

is performed on a sampling frequency group other than the selected sampling frequency group, playback will be faster

or slower.

●Misoperation detection and failure detection functions

◆SPP pin and SPM pin short detection

[ ] After inputting SAFE command, start the analog power-up operation by AMODE command within 10ms.

◆Flash memory error detection

[ ] If the error bit (ROMERR) is set to "1" after the PUP command and before the PLAY command or START command

starts playback, this LSI may have error at the time of start. In such cases, initialize this LSI by moving the LSI to the

power-down mode by resetting the LSI by the RESETB pin or by using PDWN command.

◆Detects the stop of clock input from a crystal resonator or ceramic resonator

[ ] If the RDERR command (first byte) is inputted before the crystal or ceramic resonator stops and switches to RC

oscillation (about 500

μs), the CBUSYB pin will remain "L". Therefore, read the command after the CBUSYB pin

becomes "H".

[ ] When the crystal resonator or the ceramic resonator stops and switches to RC oscillation, playback may become

abnormal. Therefore, after confirming that the error bit (OSCERR) is "1", enter STOP command to stop playback.

◆Detects disconnection/short circuit of LRCLK

[ ] *5 The unit does not recover even if a normal LRCLK is input after stopping playback. Enter MUON command

→SAICH command after inputting a normal LRCLK.

◆Detects disconnection/short circuit of SAI_IN

[ ] When OUTEN is set to "1" and INEN is set to "0" by the SAICON command, the SAI_IN input is disabled. Therefore,

set SAIINEN to "0".

◆Mixing number error detection

[ ] When using the serial audio interface (SAI), the sampling frequency limits the maximum number of mixings and

playable channels.

■Timing chart

●Common

◆Power-on timing

[ ] Start up in the order of DVDD, SPVDD and IOVDD or DVDD, IOVDD and SPVDD.

[ ] Be sure to input "L" to the RESETB pin before inputting the first command after power-on.

[ ] Be sure to enter "L" at the RESETB pin when the DVDD is below the (recommended) operating voltage range.

◆Power-off timing

[ ] Shut down in the order of IOVDD, SPVDD, and DVDD or SPVDD, IOVDD, and DVDD.

[ ] Shut down each power supply after changing to the power down status with PDWN commands.

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