ADXRS450 Digital Gyroscope : Needing help to generate 24V on CP5.

DyfanDavies on Dec 12, 2014

Hi,

I'm currently working on the ADXRS450 Gyroscope and I am concerned about my hardware configuration. In regards to the boost converter, supplying 3.3V to the IC results in 12.5V on CP5, which I believe to be to low . Communicating to the IC believe works as the data I recieve back is a read/write error response. The result is true for supplying 5V aswell, the voltage generated on CP5 is 20V which again is too low. The Diode and Inductor fit the specification mentioned in the data sheet. Are there any other factors that could affect/missed for this voltage step up?

Thanks,

Dyfan

0 ADIApproved

on Dec 16, 2014 9:42 PM over 6 years ago
Hi Dyfan,

Are you using a higher value inductor (560uH) for 3.3V operation as noted on page 10 of the datasheet? Even at 5V supply the CP5 voltage is low and this may be due to leakage current. The diode is the primary source of leakage current which has to be kept <70uA.

Regards,

Venkat
Cancel
Up 0 Down

Reply

Verify Answer

Cancel
0 DyfanDavies on Dec 17, 2014 4:19 PM over 6 years ago

Hi Venkat,

Thank you for your reply. I have tried a 560uH for 3.3V but gives me the 12.5V I previously mentioned. As for the diode I am using a S1A diode which at 25 *c has a reverse leakage current of 5uA which should be fine. I have replaced the diode and inductor incase they had broken but i still get the same result

Cheers,

Dyfan
Cancel
Up 0 Down

Reply

Verify Answer

Cancel
0 ADIApproved

on Dec 17, 2014 7:37 PM over 6 years ago
Hi Dyfan,

I am wondering if the part is defective. Do you have more than 1 sample to test?
Cancel
Up 0 Down

Reply

Verify Answer

Cancel
0 EZAdministrator

on Aug 2, 2018 2:51 PM over 3 years ago
This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

Thank you,
EZ Admin
Cancel
Up 0 Down

Reply

Reject Answer

Cancel