On 08/30/2016 03:35 PM, Luke Kenneth Casson Leighton wrote:
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
On Tue, Aug 30, 2016 at 6:51 PM, Joseph Honold mozzwald@gmail.com wrote:
I'm reading the eoma spec at elinux and there is limited information regarding the power requirements. It states "a maximum of 3.5 watts should be respected" and "Type II Cards should not exceed an average of 3.5 watts power consumption" and "must adjust accordingly and stick within the 4 watt heat dissipation budget".
those are practical guidelines. if you want to do an EOMA68 module that requires 4 to 4.5 watts you should look at flooding it with thermal gel and sealing it. 3.5 to 4.0 watts you can get away with using the exact same graphite paper that's used in mobile phones.
Is there a minimum requirement for supply current that must be available to the cpu card from a housing/device/socket for compatibility with multiple cpu cards (3.5 or 4 watts)?
there is no minimum requirement. the maximum requirement is 1.0 A @ 5.0V. above that, housings are REQUIRED to CUT ALL POWER WITHOUT WARNING, for safety reasons.
Seems like there should be a minimum power requirement that all cpu cards and devices must meet. What happens if someone makes an ultra low power cpu card that peaks at 200mA and I design my device/housing to meet that 200mA but not higher and I try to plug the A20 card into it? It will be unstable or not work at all.
What is the A20 cpu card power consumption (average/peak)?
peak is around 3.5 watts.
So, the minimum requirement for the A20 cpu card is ~700mA peak?