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Part Number: LMK03328
Hi allWould you mind if we ask LMK03328?There is the description, "As shown in Figure 85, the PDN pin can be left floating, pulled up externally to VDD, or otherwise driven by a host controller for meeting the clock sequencing requirements in the system."The PDN pin can be left floating and pulled up externally to VDD.So, which is the recommendation between floating and pulled up for stability?Kind regards,Hirotaka Matsumoto
Hi Hirotaka-san,
If you're using single supply, i.e., all power pins ramp up at the same speed, then you can leave the pin floating.
However, if the supply pins ramp up at different speeds, then you may need to slow down the PDN pin ramping by adding a capacitor to ground. You can still use 200kOhm internal pull up and choose a smaller capacitor, or use external pullup. This really just affects the ramping speed of this pin - it decides the current flow with which the capacitor is being charged.
Regards,Hao
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