TPS65911: Register configured by EEPROM shown in user's guide

Hi, Yoshikazu,

 A1: You're right! I've marked the typo and will make correction whenever get change to revise it,. Thank you for the catch up! 

 A2: They're "Supply state" bits; they're decided by 2 comparators for system status detection/control; the supply state can be overwritten programming ST[1:0]) to keep some regulator on. 

A3:  Please refer to the user guide Figure 4. Power Sequencing.

A4: The VIO has been configured as 3.3V by SEL[3:2]=11; ILMAX=0x0 as reset, so VIO is configured as 0.6A as ILMAX when reset; if current is not enough, customer can re-configure it in VIO_REG set ILMAX according to required maximum current. Same thing should be done for VDD1, 2 current limit by re-configuring it in VDD1_REG, and VDD2_REG registers.

Hello Phil,

Thank you for your reply.  I understand the registers configured by EEPROM are described in table 2 in the user's guide.  The others are reset values shown in TPS65911 datasheet from page 65 as register maps.

I got another question about the sequence of TPS65911A which is PMIC for 66AK2G12.  66AK2G12 datasheet page 97 says these as power down sequence.  It requires DVDD33 to be valid until the other power supplies decay.

The power down sequence of TPS65911A is off at the same time as shown on page 37 in the datasheet, so VIO mustn't be used for DVDD33 of 66AK2G12, but TPS65911A user's guide(swcu187a.pdf) on page 3 (figure 2) shows VIO supplies 3.3V to DVDD33.  Does the figure meet the sequence requirements of 66AK2G12?  It doesn't look so, but would you please give me your comments?.

Best Regards,

Yoshikazu Kawasaki

Hello Phil,

I wasn't able to paste the pictures last time.  I hope I can do that this time.  If you look at below 3 pictures, you would see TPS65911A user's guide doesn't show the recommended power mapping from 66AK2G12 since DVDD33 from VIO doesn't keep it until the others turn off.  Would you please give me your comments?

The power mapping between TPS65911A and 66AK2G12 is shown in user's guide on page 3 as below

TPS65911A_powerMapping.pptx

The one showing the TPS65911A power up/down sequence in the datasheet on page 37 as shown below

TPS65911A_Sequence.pptx

The one showing the 66AK2G12 power up/down sequence in the datasheet on page 97 as shown below

66AK2G12_Sequence.pptx

Best Regards,

Yoshikazu Kawasaki

Hi, Yoshikazu,

  Datasheet is correct; DVDD33 from VIO can be turned off at the same time when the others turn off as long as the PORn hold low when DVDD33 and other rails are valid.  

Hello Phil,

Thank you for your comments.  I know the datasheet showing the power down sequence should be correct.  What I'd like to know is if TPS65911A user's guide(swcu187a) on page 3 providing DVDD33 from VIO is correct or not.  Since all the power rails will turn off at the same time, it looks violating the power down requirement from 66AK2G12 shown on page 97 in the datasheet(sprsp07f) since DVDD33 needs to be provided even after the other power rails turn off.  Would you please give me your comments for the power down sequence requirement from 66AK2G12?

Best Regards,

Yoshikazu Kawasaki