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SGTL5000 VDDIO and LINREG_D_POWERUP.

Question asked by Satoshi Shimoda on Feb 6, 2014
Latest reply on Feb 19, 2014 by Jose Alberto Reyes Morales

Hi community,

 

I'm using SGTL5000 with i.MX53.

However, some i.MX53 on our custom boards cannot communicate with SGTL5000.

I think this issue is NOT caused by SGTL5000, because 1.8V is supplied from external LDO to VDDD and other I2C slave devices on same bus work correctly.

Then, I want to confirm about SGTL5000.

Please see my questions below.

 

[Q1]

Please see Table 33 in SGTL5000 datasheet (Rev.6).

I understand LINREG_D_POWERUP initial value is 0x0 and I should set it to 0x0 if 1.8V external power is supplied to VDDD, should I?

But I doubt the initial value because about 1.6V is output from VDDD on the time 3.3V is supplied to VDDIO when power-up.

Is the initial value correct? or should I set it to 0x1 in the case?

 

[Q2]

Please see Description of ER1 in SGTL5000ER (Rev.2).

It says "The preferred supply sequencing is VDDIO/VDDA(it does not matter which comes first) and then VDDD".

Then, if I supply VDDD before VDDIO or VDDA, what is happen?

 

Best Regards,

Satoshi Shimoda

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