DS90UB926Q-Q1: Will the i2c reading, interrupt signal communication and the use of fast GPIO caused the down grade of the color resolution?

PYTsai

Part Number: DS90UB926Q-Q1
Other Parts Discussed in Thread: DS90UB948-Q1

In our application DS90UB926Q-Q1 is connected to a touch panel and the serializer is DS90UB921Q-Q1 .

We are using I2C and interrupt to read the touch panel and fast GPIO to read the IR signal.

One question would like to check.

Will the i2c reading, interrupt signal communication and the use of fast GPIO caused the down grade of the color resolution?

Thanks!

over 6 years ago

0 Casey McCrea over 6 years ago

TI__Guru** 103215 points

Hello PYTsai,

For 926 the GPIOs (for communicating an interrupt over the back channel for example) are only available in 18 bit color mode. So yes, if you need to use this back channel GPIO for an interrupt then the color resolution will be reduced. If you can simply poll the touch controller continuously without using a GPIO interrupt then you can use 24 bit color mode.

Best Regards,

Casey

0 PYTsai over 6 years ago in reply to Casey McCrea

TI__Genius 11785 points

Hi Casey,

If both 24 bit color and interrupt GPIO are needed, any other device you would suggest?

0 Casey McCrea over 6 years ago in reply to PYTsai

TI__Guru** 103215 points

Hello PYTsai,

Unfortunately we do not have another similar deserializer with parallel RGB output and more GPIO. The only other suggestion I could make would be if you could use OLDI instead of parallel RGB you could use DS90UB927-Q1 or DS90UB948-Q1 instead.

Best Regards,

Casey

0 PYTsai over 6 years ago in reply to Casey McCrea

TI__Genius 11785 points

Hi Casey,

Do you mean DS90UB921 at processor side to work with DS90UB928 or DS90UB948 at panel side?

Or DS90UB927 + DS90UB928 or DS90UB948 as a pair ?

0 Casey McCrea over 6 years ago in reply to PYTsai

TI__Guru** 103215 points

Hello PYTsai,

You would need to use OLDI on both sides to get the extra pins so 927 or 947 with 928 or 948.

Best Regards,
Casey

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DS90UB926Q-Q1: Will the i2c reading, interrupt signal communication and the use of fast GPIO caused the down grade of the color resolution?