PCM1863 power up and digital reset

KANJI SHIBATANI

Mastermind 6205 points

Other Parts Discussed in Thread: PCM1863

Hello

Would please let me know about PCM1863?

Customer is using PCM1863 for DVDD=IOVDD=1.8V as I2S salve mode.

Please let me confirm.

Can we use PCM1863 at DVDD=1.8V?

We see Data sheet page 6 "6.5 Electrical Characteristics, DC" shows several 1.8V DVDD current specs,...

however,data sheet p60/Table 24 describes DVDD should be 3.3V.

Which is correct ? ( Page 6 is TYPO of IOVDD, not DVDD...? Or description on page 60 is not enough??)

If customer use PCM1863 for AVDD=3.3V,DVDD=IOVDD=1.8V, customer should do following 3 things.., isn't it?

Please let me confirm

a;Input 1.8V to LDO pin.

b;set PCM1863 slave mode via SPI/I2C. Page.0 0x20 - Set MST_MODE=1 (I2S Slave)

c;PLL is disabled Page0/0x20 via SPI/I2C

Page0 / Register 32 (Hex 0x20) b0 (CLKDET_EN)=0 Page0 / Register 40 (Hex 0x28) b0 (PLL_EN)=0

If customer used PCM1863 for Slave mode , i.e. customer do not use PLL,

he should apply SCK,BCLK,LRCK from external circuit.

In this slave mode , he should keep following? ..

a:BCK per LRCK should be set to 64.

b:Keep the 8.21.5.1 Interface Timing

c:Master clock(SCK) should be audio clock, for ex. 256 or 384 or 512fs

d:Master clock( =sck = OSC clock on page 62 )should be correctly applied at the same time of DVDD exceeds > 1.5V for digital reset.

In customer's product, they don't keep the criteria on Q3-d ( please see attached ).

As per customer's comment, 1time /20times power on test , frequency responce is illegal

( Drops in a few KHz: BAD case/ 20KHz: Good case).

In such a case, PCM1863 stucks in such a phenomenon unless othewise Ower Off/ On again.

Following should be necessary?

* SCKI should be applied at the same time with DVDD >1.5V?

* Should customer apply LRCK/BCK at the same time of SCKI (OSC clock ) ?

Would you please let me know the way to digital reset the PCM1863 except power off/on?

There are no reset pin in PCM1863, so we can use page0/ REG 0x70 ?

Please advise.

Thank you for your cooperation and with my Best Regards

over 8 years ago

0 Justin Bohr over 8 years ago

TI__Mastermind 27870 points

Hi Kanji,

Q1: This is a typo, only IOVDD can operate at 1.8 V, DVDD must be at 3.3 V.

Q2: To use the PCM186X in salve mode, the easiest configuration is to set the device into slave mode, and leave Auto Clock Detector enabled. This will allow the part to configure itself to work with the slave clocks. To use IOVDD at 1.8V, 1.8V should be supplied to the LDO pin as well as the IOVDD pin.

Q3: Yes these settings should work.

Q4: This might be a symptom of turning off the Auto Clock detector. Try leaving this enabled and see if the issue continues. Clocks can all be applied at the same time.

Q5: You can reset the register by writing 0xFF to register 0x00. Register 0x70 will not reset the part, but it will power down the specified domains.

Justin

0 KANJI SHIBATANI over 8 years ago in reply to Justin Bohr

Mastermind 6205 points

Dear Justin-san,

Thank you for your answer.

Best Regards

0 Justin Bohr over 8 years ago in reply to KANJI SHIBATANI

TI__Mastermind 27870 points

Hi Kanji,

I just wanted to update the last question. It is actually 0xFE that you write to 0x00 to clear the registers.

Justin

0 KANJI SHIBATANI over 8 years ago

Mastermind 6205 points

Dear Justin san

Thank you for your update!

I had informed customer that AUTO CLOCK DETECTOR shoud work ，if sck,BCK,LRCK

which comes from FPGA , does not applied at the same time...therefore,

DVDD must be 3.3V according to your advice.

My customer had changed the timing to

apply all clocks at the same time.

However ,customer is stil using DVDD as 1.8V because PCB cannot be changed,also,

power consumption will be changed.

Anyay,I think datasheet shoud be reviced.

Thank you and Best Regards

2016年1月29日金曜日、Justin Bohr<bounce-3441231@mail.e2e.ti.com>さんは書きました:

A Message from the TI E2E™ Community

Justin Bohr replied to PCM1863 power up and digital reset.

Hi Kanji,

I just wanted to update the last question. It is actually 0xFE that you write to 0x00 to clear the registers.

Justin

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PCM1863 power up and digital reset