LPC11U14F vs LPC11U35FBD48

[SHADOWua]

Hello dear community! Can some one help me with my opinion?

I have asus keyboard strix tactic pro v1.4 and some time ago I can't solve the problem with microcontroller. On board I have LPC 11U14F and have the option to replace him by LPC 11U35FBD48.

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So my question is;
- Are they interchangeable and will I be able to upload the same firmware to the new chip as to the old one?
Thanks in advance.
P. S. I'm still not completely sure that the original chip is not working, tell me how to check it.

[SHADOWua]

Thank you for help! 

[ZhangJennie · Accepted solution]

Hello SHADOWua 

Both LPC11U14FBD48 and LPC11U35FBD4 belong to NXP's LPC11U series, use ARM Cortex-M0 cores, and share the same 48-LQFP package and pin-to-pin compatiable. This means, from hardware aspect, you don't need to change PCB if replace LPC11U14FBD48 with LPC11U35FBD4.

LPC11U35 has ​​64KB Flash​​ and ​​10KB RAM​​, while LPC11U14 has ​​32KB Flash​​ and ​​6KB RAM​​. LPC11U14 memory and resource addresses are all defined in LPC11U35. So theorilly, LPC11U14FBD48 firmware can work on LPC11U35FBD4.

Hope this helps,

Jun Zhang