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by javaraspi
Fri May 24, 2019 6:36 pm
Forum: Compute Module
Topic: Component layout
Replies: 2
Views: 483

Re: Component layout

Hello Andy. Just worried about noise pick up. The the components are maily resistors are mainly resistors that carry a PWM signal (low freq) for driving a MOSFET, some decoupling caps in the VBAT, 3V3, 1V8 and VDAC pins and two resistors connected in series with the UART0 pins. No space issue here s...
by javaraspi
Fri May 24, 2019 5:35 pm
Forum: Compute Module
Topic: Component layout
Replies: 2
Views: 483

Component layout

Hello community.

Is there any restriction in placing components under the CM3+ module?
Just need to lay some resistors and caps.

Thanks for your help!
by javaraspi
Wed May 08, 2019 1:28 pm
Forum: Compute Module
Topic: USB OTG
Replies: 0
Views: 281

USB OTG

Hello community. Working now in the USB section of my design. I planning to use the USB as dual role host & device port. The behaviour will be determined if a USB OTG adapter (like the ones included with some cell phones) is plugged (act as host) or not (act as device). I am using a micro USB connec...
by javaraspi
Wed May 08, 2019 12:39 pm
Forum: Compute Module
Topic: Power Supply Sequence
Replies: 8
Views: 746

Re: Power Supply Sequence

Excellent!
Thanks all for your inputs!
by javaraspi
Sun Apr 28, 2019 4:07 pm
Forum: Compute Module
Topic: Power Supply Sequence
Replies: 8
Views: 746

Re: Power Supply Sequence

Thanks Hippy for you comment. The datasheet also says "Alternatively supplies can be synchronised to come up at exactly the same time as long as at no point a lower voltage supply rail voltage exceeds a higher voltage supply rail voltage" I´ve seen a couple of baseboards (WaveShare Compute Module IO...
by javaraspi
Sat Apr 27, 2019 9:41 pm
Forum: Compute Module
Topic: Power Supply Sequence
Replies: 8
Views: 746

Power Supply Sequence

Hello everyone. The datasheet states power supply voltages should come up from higher to lowes in order to avoid latchup. I´ve seen some designs that simply put 2 or 3 LDOs directly tied to the 5V input. Does anyone hahave implemented the powerchain this way & experienced latch up? . Thanks for your...
by javaraspi
Fri Apr 26, 2019 9:43 pm
Forum: Compute Module
Topic: SODIMM Connector
Replies: 2
Views: 292

Re: SODIMM Connector

Agree!.
Thanks for your comment.
by javaraspi
Wed Apr 24, 2019 11:15 pm
Forum: Compute Module
Topic: SODIMM Connector
Replies: 2
Views: 292

SODIMM Connector

Hello community good afternoon. I am planing to use the compute module in an off road application. There will be some vibration involved. I will use some standoffs to fix the module to the PCB but i am worried about the SODIMM connector itself. Does anyone know if there is a more rugged version of t...
by javaraspi
Thu Apr 11, 2019 4:06 am
Forum: Compute Module
Topic: Sleep & Wake Up
Replies: 0
Views: 204

Sleep & Wake Up

Hello community. I am planning a development around CM3+. For my particular application it is needed to have the CM go to sleep (low power state) or wake up according an external ignition signal (digital signal). Is this possible?. Any ideas for the minimum idle power consumption that can be achieve...
by javaraspi
Thu Apr 11, 2019 3:31 am
Forum: Compute Module
Topic: USB Type C: Do I need to do anything different for USB_OTG?
Replies: 3
Views: 3134

Re: USB Type C: Do I need to do anything different for USB_OTG?

Hello,

Did your design worked?
Best regards
by javaraspi
Thu Apr 11, 2019 3:05 am
Forum: Compute Module
Topic: USB-OTG Problems
Replies: 6
Views: 837

Re: USB-OTG Problems

Hello goapi.

Could you make the OTG work with the solution proposed by ghs?

Thanks!
by javaraspi
Tue Feb 05, 2019 6:31 pm
Forum: Compute Module
Topic: CM3 on 2 layer PCB
Replies: 5
Views: 1158

Re: CM3 on 2 layer PCB

Hello aBUGSNighmare,

Excellent. Thanks for your comments!
by javaraspi
Tue Jan 29, 2019 4:54 pm
Forum: Compute Module
Topic: CM3 on 2 layer PCB
Replies: 5
Views: 1158

Re: CM3 on 2 layer PCB

Hello John thanks for your answer. You are right, the cost diference between 2 and 4 layer, considering the additional work hours and reliability of the design becomes marginal. I think I will go ahead with 4 layer. Does this stacking sounds good to you: 1st Layer -> Signals for USB & Camera 2nd Lay...
by javaraspi
Tue Jan 29, 2019 4:53 pm
Forum: Compute Module
Topic: CM3 on 2 layer PCB
Replies: 5
Views: 1158

Re: CM3 on 2 layer PCB

Hello John thanks for your answer. You are right, the cost diference between 2 and 4 layer, considering the additional work hours and reliability of the design becomes marginal. I think I will go ahead with 4 layer. Does this stacking sounds good to you: 1st Layer -> Signals for USB & Camera 2nd Lay...
by javaraspi
Fri Jan 25, 2019 8:46 pm
Forum: Compute Module
Topic: CM3 on 2 layer PCB
Replies: 5
Views: 1158

CM3 on 2 layer PCB

Hello community, good afternoon. I am currently working in a project that includes CM3 module. The design makes use of the following peripherals: - USB Port - Camera Port - SPI Port - Some digital I/O for status and control Is it possible to have it running in a 2 layer PCB design?. Thanks for you h...

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