Dear 亚权 白,
the datasheet for the FS26 is confidential. It can be downloaded only with a valid NDA (Non Disclosure Agreement) with NXP.
If you have a valid NDA with NXP, you should be able to download the FS26 from the FS26 product page, under the Secure section.
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If you haven't the NDA yet and you would like to sign one, please create a new ticket here and an NXP representative for NDA matters will help you with the process.
With Best Regards,
Jozef