T1042 RCW source pins issues

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T1042 RCW source pins issues

Contributor I


          We have built up some 10 prototypes using the T1042 processor and most of these are working. We are able to boot the card through SPI flash. but strangely we are facing a problem with one card. The processor is able to boot as it not getting correct values at RCW source pins. We are using a resistor network to make the desired setting. RCW pins are pulled up to 1.8V  with 4.75k resistor to make high and pulled low with 4.75k to make low wherever required. but wherever we required high, we are getting 1.8V but where we need low we are getting 1.5V. it seems the processor is driving those pins. Pl suggest what could be the reason of getting such voltages. It is card-specific issue but I am not able to resolve it.

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NXP TechSupport
NXP TechSupport

1. Please show schematic of pull-up and pull-down connection for better understanding.

2. Please specify, which particular pin shows this behavior

3. Please the same pin on "good" board, and provide resulting voltage value.

4. Please confirm that all assembly-related questions are verivied already (soldering is tested by X-ray examitation, all board components are checked if they are present, properly mounted and have desired value). 

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