TUSB7320 ~GRST input

stephen crompton

Other Parts Discussed in Thread: TUSB7320

The TUSB7320 configures its ~GRST input pin as an output pin intermittently as 3.3Volt begins to rise and drives the ~GRST high. When is the ~GRST input pin correctly configured as an input?

over 9 years ago

0 Elias Villegas M. over 9 years ago

TI__Guru* 76130 points

Hello,
the pin is configured by the core which is powered by the 1.1V rail, I recommend to use a power-good signal from the 1.1V regulator to de-assert GRSTz.
Please review the chapter 4 of this document www.ti.com/.../sllu149d.pdf
Regards

0 stephen crompton over 9 years ago in reply to Elias Villegas M.

Prodigy 20 points

I have verified that the behaviour of the TUSB7320 ~GRST signal is unpredictable until the 1.1V regulator begins to regulate. The 1.1V regulator power-good signal is not valid until the 1.1V rail is in the specified range. Its caused me some grief but I'm working around it.

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TUSB7320 ~GRST input