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TUSB1064: Pin handling

Yuto Kitamura
Expert 7305 points

Part Number: TUSB1064

Dear team,

We are considering replace it from Parade: PS8742B due to the PD1.4 requirements.

Q1: When using I2C control, can we left open 11pin(EQ0), 14pin(EQ1), 2pin(DPEQ1) and 3pin(SSEQ1)? or do we need to pull-down or -up to somewhere? If possible open is preferred for design.

Q2: Are we able to directly tie EN(pin-29) to 3.3V without pull-up resistor? TUSB1064-Q1 D/S mentions it requires 10k or 50kohm resistor. PoV of replacement from competitor, no resistor is preferred as well as Q1.
TUSB1064: 
image.png

TUSB1064-Q1: 
image.png

Best regards,
Yuto 

  • +1
    TI__Mastermind 49591 points

    Hi,

    Yuto Kitamura said:
    Q1: When using I2C control, can we left open 11pin(EQ0), 14pin(EQ1), 2pin(DPEQ1) and 3pin(SSEQ1)? or do we need to pull-down or -up to somewhere? If possible open is preferred for design.

    Yes leaving these EQ control pins floating is OK if I2C mode will be used. 

    Yuto Kitamura said:
    Q2: Are we able to directly tie EN(pin-29) to 3.3V without pull-up resistor? TUSB1064-Q1 D/S mentions it requires 10k or 50kohm resistor. PoV of replacement from competitor, no resistor is preferred as well as Q1.
    TUSB1064: 

    Its best to use a resistor PUP to limit the current pulled into EN. This pin has an internal PDOWN.