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Hysteresis function on IOMUX receiver

Question asked by Takayuki Ishii on May 31, 2017
Latest reply on May 31, 2017 by Takayuki Ishii

Hello,

 

I try to understand about hysteresis function on IOMUX receiver by datasheet and

Influence of Pin Setting on System Function and Performance.

 

Following is a my understanding.

Is it correct?

 

      |   min  |   typ  |   max  |
------+--------+--------+--------+------
Vhys  |   250  |   ---  |   ---  | mV
 VT+  |0.5*ovdd|   ---  |   ---  | V
 VT-  |   ---  |   ---  |0.5*ovdd| V

 

0.5* 3.3  = 1.65
0.5* 1.8  = 0.9
0.5* 0.25 = 0.125

   transittion  |   ovdd  |  min
----------------+---------+-------
     L -> H     |   3.3   | 1.775 = 1.65+ 0.125
     L -> H     |   1.8   | 1.025 = 0.9 + 0.125

 

  transittion   |   ovdd  | max
----------------+---------+-------
     H -> L     |   3.3   | 1.525 = 1.65- 0.125
     H -> L     |   1.8   | 0.775 = 0.9 - 0.125


for ovdd=3.3v
             |
     +---------------+------
     |       |       |
     |       |       | T+ = 1.775
-----|-------+-------|----------
     |<------------->| Vhys = 250mV
     |       |       |
 ----+---------------+
     :       |
     :
     T- = 1.525

 


for ovdd=1.8v
             |
     +---------------+------
     |       |       |
     |       |       | T+ = 1.025
-----|-------+-------|----------
     |<------------->| Vhys = 250mV
     |       |       |
 ----+---------------+
     :       |
     :
     T- = 0.775

 

Best regards,

Ishii.

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