Re: [Paparazzi-devel] Lisa/M CheatSheet

[Simon Goodwin]

Hi,

my toughts on voltage an current.

- V_Bat max. originats from keeping V_BAT_MEAS under 3V3
I calculated that to be 19V8.
- limits of 5V regulator
The shematics on the wiki state the 5V regulator to be a LP2992.
This garantees operation for Imax=250 mA, 5V5 < V_IN rail < 16V and 0 < 
5V rail < 9V.

Open questions:
- max. USB power is given by min. of USB-Specs and the USB-VCC diode
What are the limits of the diode? What diode is used?
- limits of 3V3 regulator
What regulator was used here? What are the limits?

Input is welcome.

Cheers,
Simon Goodwin


Am 22.07.2011 09:11, schrieb Christophe De Wagter:
> Great work!
>
> About possible additions:
>
> -I was wondering which I2C (SDA/SCL) were 3.3V and which 5V and in
> general which pins (GPIO) are 5V tolerant.
> -The max input is 19V but I can imagine it gets pretty hot when you hang
> your gps, xbee, etc to the board (300mA x 12V = 4Watt). Isn't there a
> power dissipation limit (also considering the temperature sensitive IMU
> closeby)
> -How much is the current rating for the USB-to-Vcc Diode? When
> developping it is great to only have to plug in usb to power the board
> but I don't want to burn the 0402 diode (100mA 300ma?)
>
>
> -Christophe
>
>
>
> 2011/7/17 Simon Goodwin <address@hidden <mailto:address@hidden>>
>
>     Dear Paparazzians,
>
>     find attached "Lisa/M CheatSheet" which I compiled while getting
>     warm with this nice little board.
>
>     I would like to ask you to fill in the voids or correct errors so I
>     can finish it off and make it available.
>
>     Where would be the place to put something like this?
>     The Lisa/M page on the Wiki?
>     The doc dir in the repo?
>     The downloads page on the wiki?
>     Maybe create a new Page for CheatSheets?
>
>     Cheers
>     Simon
>
>
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