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Why clock is not received during asynchronous communication in TDA8035 chip?

Question asked by shivakeerthan gopalakrishna on Oct 12, 2016

I am using TDA8035 chip as interface between smart card reader and micro controller. Chip has 2 options to provide clock to the smart card.

1) external clock : clock provided by controller

2) external crystal oscillator connected to XTAL1 and XTAL2 pins of chip.


I am providing clock from controller during synchronous communication. But i am not getting clock to the smart card during asynchronous communication. As per datasheet/application note there is no option to disable or enable clock out of the chip. I have not found any information about this issue anywhere. Please suggest