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adxrs401 gyroscope troubleshooting

Greetings!

I've been experiencing some problems with my ADXRS401 gyro chip.
I've actually fabricated a circuit board quite similar to that
included in the datasheet
of the ADXRS401 evaluation board (actually, copied it verbatim =)

When I tested the chip, the rate output is stuck at 1.25 volts, even
in slightly
accelerated rotation. I've also tried to excite the self test pins but
the change in
the output rate voltage is very very minimal. the capacitors that I've
used for the
charge pump are the ceramic type. (Vcc = 5V)

What puzzles me more is that the Temperature Sensor and the 2.5v
Voltage Reference pins are both working, indicating that I've powered
up the chip properly.

I have two ADXRS401 chips and both of them act exactly the same way.

My hunch is that the charge pump circuit is not working properly but I
don't have
any idea how to check it.

Any of you guys have encountered the same problem? Or at least those
who have
experienced working with this chip, did you encounter some
difficulties at the start or made any modifications in the interface
circuit provided in the datasheet?

any feedback would be highly appreciated. thanks!


url of the datasheet: http://www.analog.com/UploadedFiles/Evaluation_Boards_Tools/641887514ADXRS401EB_0.pdf
 
Greetings!

I've been experiencing some problems with my ADXRS401 gyro chip.
I've actually fabricated a circuit board quite similar to that
included in the datasheet
of the ADXRS401 evaluation board (actually, copied it verbatim =)

When I tested the chip, the rate output is stuck at 1.25 volts, even
in slightly
accelerated rotation. I've also tried to excite the self test pins but
the change in
the output rate voltage is very very minimal. the capacitors that I've
used for the
charge pump are the ceramic type. (Vcc = 5V)

What puzzles me more is that the Temperature Sensor and the 2.5v
Voltage Reference pins are both working, indicating that I've powered
up the chip properly.

I have two ADXRS401 chips and both of them act exactly the same way.

My hunch is that the charge pump circuit is not working properly but I
don't have
any idea how to check it.

Any of you guys have encountered the same problem? Or at least those
who have
experienced working with this chip, did you encounter some
difficulties at the start or made any modifications in the interface
circuit provided in the datasheet?

any feedback would be highly appreciated. thanks!

url of the datasheet:http://www.analog.com/UploadedFiles/Evaluation_Boards_Tools/641887514...

BGA package, eh? probably got a solder bridge under the chip. try
reflow the chip...
 
BGA package, eh? probably got a solder bridge under the chip. try
reflow the chip...


yes, its the BGA package, unfortunately. *LOL*

well, i have reflowed the chips for nth time. I'm a bit wary now that
i might burn the chip
anytime on the next reflow. haha!

but nonetheless, ill try to reflow it again, hopefully, that would
solve my problem.

anymore insights? big thanks!
 
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