i.MX6 keypad port switch resistance

[matthewlinder]

Hi,

     We will be using the keypad port on our i.MX6 design. The company we are getting the

actual keypad PC board from says that due to the conductive ring used for the switch the

resistance will be about 1k ohms.

Is this ok? I didn't see a maximum switch resistance in the specification anywhere.

Thanks,

Matt

[matthewlinder]

Hello?

Anybody from Freescale monitoring these boards?

[igorpadykov]

Hi Matthew

yes 1k ohms will be good.

Please look how KPP module works in

Figure 38-1 "KPP Peripheral Block Diagram", Figure 38-4

i.MX6DQ Reference Manual (rev.1  4/2013)

Also sect.36.4.369 Pad Control Register (IOMUXC_SW_PAD_CTL_PAD_KEY_ROW1)

shows KPP module pull-up values, they are enough big for correct operation

with 1k ohms keypad.

IMX6DQRM

i.MX 6Dual/6Quad Applications Processor Reference Manual

Best regards

chip

-----------------------------------------------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer button. Thank you!

-----------------------------------------------------------------------------------------------------------------------

[matthewlinder]

Hello?

Anybody?