i.MX ProcessorsのトピックHysteresis function on IOMUX receiver

Hysteresis function on IOMUX receiver

t-iishii — Wed, 31 May 2017 09:18:57 GMT

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.

Re: Hysteresis function on IOMUX receiver

Yuri — Thu, 01 Jun 2017 05:58:52 GMT

Hello,

Your understanding is correct.

Have a great day,
Yuri

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Re: Hysteresis function on IOMUX receiver

t-iishii — Thu, 01 Jun 2017 06:35:10 GMT

Hello Yuri,

Thank you for your quick response.

I will answer it my customer.

Best regards,

Ishii.