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TPS650864: Pin setting when BUCK 6 and VTT is not used

Kazuya Nakai59
Guru 20130 points
Part Number: TPS650864
Other Parts Discussed in Thread: CSD85301Q2,

 Hello guys,

 One of our customers is considering to use PMIC, TPS65086470 for Artix-7.

 Then they want to know what the following pins setting should be set to because they don't need BUCK6 and VTT in their system case. 

 So could you please tell me the correct pin setting of the following pins for no BUCK6 and VTT using?

   39(DRVL6)        　OPEN?
　40(PGNDSNS6)　GND?
　41(BOOT6)　       OPEN?
　42(SW6)           　OPEN?
　43(DRVH6)       　OPEN?
　44(FBOUT6)　     OPEN?
　45(ILIM6)　          OPEN?
　46(PVINVTT)　    GND?
　47(VTT)　            Connected to No.48(VTTFB)
　48(VTTFB)　      Connected to No.47(VTT)

 Your reply would be appreciated.

 Best regards,

 Kazuya Nakai.

  • 0
    TI__Genius 17380 points

    Hi Nakai-san,

    BUCK6 will turn on if CTL2 = '1' for this OTP. Additionally, it's power fault is not masked. As a result, if BUCK6 is not connected then it will trigger emergency shutdown after 10 ms from enable (CTL2). If an alternate supply for 1.5V or 1.35V is available, it could be connected to FBVOUT6 to trick the device into thinking power good is met, but that is not recommended. Small FETs like the CSD85301Q2 can be used if high current is not needed. If I2C is available prior to CTL2 being set high, BUCK6 can be disabled by I2C.

    VTT LDO can be disabled by setting CTL3 = '0'. In this case, VTT should be floated and PVINVTT and VTTFB should be shorted to GND.

  • 0 in reply to Kevin LaRosa
    Guru 20130 points
    Hi Kevin,
    Thank you for your reply.
    Could I ask you again?
    1. If the customer can write the bit 0 of BUCK6CTRL register before CTRL2 goes high, can BUCK6 be turned off without any error?
    2. In No.1 case, are the following pins set correct?
    39(DRVL6) 　OPEN?
    　40(PGNDSNS6)　GND?
    　41(BOOT6)　 OPEN?
    　42(SW6) 　OPEN?
    　43(DRVH6) 　OPEN?
    　44(FBOUT6)　 OPEN?
    　45(ILIM6)　 OPEN?

    Thank you again and best regards,
    Kazuya Nakai.
  • 0 in reply to Kazuya Nakai59
    TI__Genius 17380 points

    Hi Nakai-san,

    You are correct, as long as 0 is written to BUCK6_DIS before CTL2 goes high, it does not need to be connected.

    SW6, PGNDSNS6, ILIM6, and FBVOUT6 should be GND; the rest floating as described.

    You can find all pins in the TPS65086x Schematic checklist here: www.ti.com/.../slva734

  • 0 in reply to Kevin LaRosa
    Guru 20130 points
    Hi Kevin,

    Thank you for you reply.

    Could I ask you one more question?

    TPS650864 has a OTP block.
    Can the OTP data be changed by customer side?
    Or is the data changing impossible because it is one time PROM?

    Thank you again and best regards,
    Kazuya Nakai.
  • 0 in reply to Kazuya Nakai59
    TI__Genius 17380 points

    Hi Nakai-san,

    Factory programmed one time programmable (OTP) banks cannot be changed customer side as they are set factory side.

  • 0 in reply to Kevin LaRosa
    Guru 20130 points
    Kevin,
    Thank you!

    Best regards,
    Kazuya Nakai.
  • 0 in reply to Kevin LaRosa
    Guru 20130 points
    Hi Kevin,
    Could I ask you a few questions because I got the questions from the customer?

    Q1. Can BUCK1 output voltage be not set to 3.3V in case of TPS65086470?

    Q2. Can BUCK1 output voltage be set to 3.3V if the customer use TPS650860?

    Thank you and best regards,
    Kazuya Nakai.
  • 0 in reply to Kazuya Nakai59
    TI__Genius 17380 points

    Nakai-san,

    Correct on both accounts, BUCK1 step size is 10 mV for TPS65086470 so max Vout is 1.67V while it is 25 mV for TPS650860 so max Vout is 3.575 V. 

    Below is a summary of the TPS650860 OTP:

    Voltages:  
    BUCK1 1.05
    BUCK1 (alternate) 1.05
    BUCK2 3.3
    BUCK2 (alternate) 3.3
    BUCK3 2.5
    BUCK3 (alternate) 2.5
    BUCK4 2.8
    BUCK4 (alternate) 2.8
    BUCK5 1.8
    BUCK5 (alternate) 1.8
    BUCK6 1.5
    BUCK6 (alternate) 1.5
    BUCK6 (alternate 2) 1.5
    LDOA1 3.3
    LDOA2 0.7
    LDOA2 (alternate) 0.7
    LDOA3 1.2
    LDOA3 (alternate) 1.2
     
    Buck Step Size:  
    BUCK1 10 mV
    BUCK2 25 mV
    BUCK3 25 mV
    BUCK4 25 mV
    BUCK5 25 mV
    BUCK6 10 mV
     
    Alternate Voltage Pin  
    BUCK1 CTL3 (masked)
    BUCK2 CTL3 (masked)
    BUCK3 CTL3 (masked)
    BUCK4 CTL3
    BUCK5 CTL3
    BUCK6 CTL6
    LDOA2 CTL3
    LDOA3 CTL3
     
    LDOA1 / SWB2 Setup:  
    LDOA1 in sequence? No
    SWB1 and SWB2 merged? No
    SWB2 or LDOA1 Emergency Shutdown Behavior Yes
     
    Load Switch Power Good Setting:  
    SWA1 PG Voltage 3.3 V
    SWB1 PG Voltage 1.8 V
    SWB2 PG Voltage 1.8 V
     
    GPO Setting:  
    GPO1 by PG or I2C? Default state if I2C? I2C, High
    GPO2 by PG or I2C? Default state if I2C? I2C, Low
    GPO3 by PG or I2C? Default state if I2C? Power good 
    GPO4 by PG or I2C? Default state if I2C? Power good 
     
    BUCK AUTO or Force PWM:  
    BUCK1 Auto
    BUCK2 Auto
    BUCK3 Auto
    BUCK4 Auto
    BUCK5 Auto
    BUCK6 Auto
     
    Discharge Resistor Setting:  
    BUCK1 100 Ohm
    BUCK2 100 Ohm
    BUCK3 100 Ohm
    BUCK4 100 Ohm
    BUCK5 100 Ohm
    BUCK6 100 Ohm
    LDOA1 100 Ohm
    LDOA2 100 Ohm
    LDOA3 100 Ohm
    SWA1 100 Ohm
    SWB1 100 Ohm
    SWB2 100 Ohm
    VTT No
     
    Power Fault Masked by Default:  
    BUCK1 No
    BUCK2 No
    BUCK3 No
    BUCK4 No
    BUCK5 No
    BUCK6 No
    LDOA1 Yes
    LDOA2 Yes
    LDOA3 No
    SWA1 Yes
    SWB1 Yes
    SWB2 Yes
    VTT No
    V5ANA Yes
     
    GPO Type  
    GPO1 Push Pull
    GPO2 Open Drain
    GPO3 Open Drain
    GPO4 Open Drain

  • 0 in reply to Kevin LaRosa
    Guru 20130 points
    Hi Kevin,

    Thank you for the information. it is very helpful for the customer and us.

    Best regards,
    Kazuya Nakai.