[AM1808]The equation to calculate the resistor value on workaround 1-(c) of Advisory 2.3.7

Keigo Ishii

Other Parts Discussed in Thread: AM1808

Hi,

I have one question about "Advisory 2.3.7 DVDD18 Can Pull Up to 2.7V When Using Dual-Voltage IOs at 3.3V" in AM1808 silicon errata(sprz313h).

On workaround 1-(c), there is the way to use a resistor to provide additional load between DVDD18 and Vss.
How should I select the resistor value? Please let me know the equation to calculate the resistor value.

Best regards,
Keigo Ishii

over 9 years ago

0 Sivaraj Kuppuraj over 9 years ago

TI__Mastermind 35645 points

Hi,

Currently, we are working on it and we will update you the response as soon as possible.

Thanks & regards,

Sivaraj K

0 Senthilkumar Srinivasan over 9 years ago

TI__Mastermind 43660 points

Hello Keigo,

For workaround 1C, you have to choose a resistor (DVDD18 to Vss) in such a way that it would draw 140 mA from DVDD18 supply rail.

Resistor value <= DVDD18/140mA

Please note, this resistor is only required during DVDD3318_X ramp up. But using a resistor continues to draw power even after the supply ramp.

Regards,

Senthil

0 Keigo Ishii over 9 years ago in reply to Senthilkumar Srinivasan

Intellectual 820 points

Hi Senthil,

Thank you!

Best regards,
Keigo Ishii

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[AM1808]The equation to calculate the resistor value on workaround 1-(c) of Advisory 2.3.7