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SN74AUP1G07: SN74AUP1G07 for application

Roy Hsieh
Prodigy 20 points
Part Number: SN74AUP1G07
Other Parts Discussed in Thread: SN74AUP1G34

Tool/software:

Dear supporters,

1. The problem of not being able to adjust the brightness in "multi adapter mode"

Adjusting the pull high resistance of RV466 (499 ohms to 2.2K ohms) can adjust the brightness.

I want to ask why?

2.

When RV466 is 499 ohms,

(1) GPIO7_BL_PWM_GPU -> can be High Low

(2) DGFF_BIA_PWM_1P8 -> keep High

Result:Cannot adjust brightness Fail

3.

When RV466 is 2.2K ohms

(1)GPIO7_BL_PWM_GPU -> can be High Low

(2)DGFF_BIA_PWM_1P8 -> can be High Low

Result:Brightness can be adjusted PASS

  • 0
    Guru 316760 points

    With a 1.8 V supply, the SN74AUP1G07 has a typical output impedance of about 100 Ω; this will form a voltage divider with RV466. And the rated drive strength is 1.9 mA, so the actual output impedance might be even higher.

    Why are you using an open-drain output? The SN74AUP1G34 would not need a pull-up resistor.