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Re: [Paparazzi-devel] Aspirin I2C Only Wiring


From: Christophe De Wagter
Subject: Re: [Paparazzi-devel] Aspirin I2C Only Wiring
Date: Thu, 24 Nov 2011 19:30:11 +0100

The aspirin expects anything from 3.6 to 7 volt to be powered. The "cleaner" the bettter: (less ripples, variations, emi, emc, emd, ...)

e.g.:
on Lisa-L use the linear dcdc 6.5V analog supply 

on the tiny/twog ... probably the less bad solution is to power it from the 5V and make sure your servo's are not powered with the onboard 5V. A big low ESR capacitor added very close to the aspirin and maybe even a 1Ohm resistor in the VCC wire towards the aspirin can also help. 

There is also a breakout board for this if you don't mind ordering a pcb.

-Christophe 



On Thu, Nov 24, 2011 at 4:41 PM, Simon Wilks <address@hidden> wrote:
Hi,

The wiki page for the Aspirin IMU (http://paparazzi.enac.fr/wiki/Inertial_Measurement_Units#Aspirin_IMU) states:

Connect Aspirin-SCK and aspirin-SCL to the I2C-SCL, aspirin-mosi and aspirin-SDA to I2C-SDA, Vcc to 5V (preferably linear), aspirin-gnd and aspirin-miso to GND, and aspirin-CS to 3.3V.

The only part I don't understand is what I need to do for Vcc to 5V (preferably linear). 

Thanks

Simon

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