ADC connections if not used, RTC VBATT connection

sab964 · ‎2006-06-08

Posted on June 08, 2006 at 12:33

sab964 · ‎2011-05-17

Posted on May 17, 2011 at 09:30

Hello,

I'm working on a design with the 128 pin STR912FW44X6.

I don't need to use the internal ADC(but I want to use GPIO Port 4 as general purpose I/Os). Are there any recommendations for connections to the pins AVSS, AVDD and AVREF ?

I want to use the RTC but don't need to supply power to the RTC Unit when

the main digital supplies (VDD and VDDQ) are switched off. Can I tie VBATT to GND oder are there other recommendations ?

Thank you in advance,

Sascha

anis · ‎2011-05-17

Posted on May 17, 2011 at 09:30

Hi Sascha,

I don't have the correct answer right now, I will ask and I will let you know rapidly.

Best regards,

STARM 😉

anis · ‎2011-05-17

Posted on May 17, 2011 at 09:30

Hi Sascha,

Please find the answers to your questions:

1- connect the AVDD, AVREF to VDDQ and AVSS to VSS

2- When not using battery for RTC, please connect the VBATT pin to VDDQ (do not connect to ground).

Best Regards,

STARM

sab964 · ‎2011-05-17

Posted on May 17, 2011 at 09:30

Thank you very much!