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Re: [Paparazzi-devel] Aspirin I2C Only Wiring
From: |
Christophe De Wagter |
Subject: |
Re: [Paparazzi-devel] Aspirin I2C Only Wiring |
Date: |
Fri, 25 Nov 2011 10:39:45 +0100 |
Dear Simon,
Now to power your aspirin (or other sensitive imu)
1) I personally prefer the i2c-only carrier board with extra linear power supply.
3) while theoretically not being ideal: in practice powering the aspirin with 3.3volt also works well (only a few millivolt dropout)
4) After checking all datasheet it looks like the imu can also be powered directly from any 2-cell or 3-cell lipo safely. (Aspirin: 3.6mA + 0.4mA + 0.8uA = 6mA. lp2992 regulator on aspirin: max voltage input: 16Volt. Power dissipation at 3-cell LiPo: 0.05 Watt = no problem)
I will check option 4 the next days to find the best (easy+good) way to power the aspirin on any twog/tiny/yapa. I expect that for the latter solution a RC filter in the power line is useful to cope with VBat fluctuations caused by motor controllers etc...
-Christophe
On Thu, Nov 24, 2011 at 8:13 PM, Simon Wilks
<address@hidden> wrote:
Hi Christophe,
I am using a YAPA V2.0 and I will power the servos separately.
Aspirin SCK and Aspirin SCL -> YAPA I2C-SCL
Aspirin MOSI and Aspirin SDA -> YAPA I2C-SDA
Aspirin GND and Aspirin MISO -> YAPA I2C-GND
Aspirin ACC_CS -> YAPA GPS-3.3V
Aspirin 5.6V -> YAPA ???
Is this correct? Where can I tap 5V from on the YAPA V2?
The carrier PCB could be interesting if I can get the Aspirin off the current carrier board. Are they available?
Thanks,
Simon
On Thu, Nov 24, 2011 at 7:30 PM, Christophe De Wagter
<address@hidden> wrote:
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
Hi,
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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