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THVD1550: Pull up and pull down resistor

Part Number: THVD1550
Other Parts Discussed in Thread: TIDA-01629

Hi Team,

My customer is using THVD1550 in their design and have some questions about the external circuit of this part.

According to the TIDA-01629 as below picture:

1. Does R76, R77 has be to 0.1W resistor? how to calculate this?

2. Why on the DATA side we have pull up and pull down resistor, while the clock side didn't have this two resistor?

Please let me know if you have any suggestions, thanks!