Difference between revisions of "I/O USB"

From Balthazar
 
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IO-board basically means connectivity with peripheral devices. These can be seen as on-board and out-board. On-board devices include: keyboard + trackpad, webcam and optional audio-card. USB is the usual solution for this. Here for the on-board periphery a simple USB 2.0 hub is enough. Main mini-computer board usually provides a much better hub for 4 downstream USB devices.  
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IO-board means connectivity with peripheral devices. These can be seen as on-board and out-board. On-board devices include keyboard + trackpad, webcam, and optional audio card. USB is the usual solution for this. Here for the onboard periphery, a simple USB 2.0 hub is enough. The main mini-computer board usually provides a much better hub for 4 downstream USB devices.  
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At this point this is still mainly USB 2.0. Of course, some type of mass storage / system disk would be needed: microSD – and especially versions of SSD (SATA or PCIe) – directly or via USB adapter.  
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At this point, this is still mainly USB 2.0. Of course, some type of mass storage/system disk would be needed: microSD – and especially versions of SSD (SATA or PCIe) – directly or via USB adapter.  
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This would benefit a faster USB port – USB3.x (part of the mini-computer system-on-chip) – or PCIE bus.
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This would benefit a faster USB port – USB3.x (part of the mini-computer system-on-chip) – or PCIe bus.
  
 
'''Our solution for internal hub:'''
 
'''Our solution for internal hub:'''
 
   
 
   
 
We chose the GL850G (ssop28-pin) four-port USB 2.0 hub chip with additional two pieces of  AIC1526-0 dual USB high-side switch – to switch-off/on manually.  It is a well-proven design. Hub will be powered via the upstream port – connected to the mini-computer board. Internal USB periphery power demands are predictable = low, so the usual 500mA limit for the hub is ok.  
 
We chose the GL850G (ssop28-pin) four-port USB 2.0 hub chip with additional two pieces of  AIC1526-0 dual USB high-side switch – to switch-off/on manually.  It is a well-proven design. Hub will be powered via the upstream port – connected to the mini-computer board. Internal USB periphery power demands are predictable = low, so the usual 500mA limit for the hub is ok.  
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The keyboard + touchpad combination is USB1.1 protocol, webcam and optional audiocard are USB2.0.
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The keyboard + touchpad combination is USB1.1 protocol, webcam, and optional audio card are USB2.0.
  
 
[[File:SchemeUSB.png|thumb|center]]
 
[[File:SchemeUSB.png|thumb|center]]
  
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Internal USB devices can be switched of manually. This helps with the privacy – the microphone and webcam. For external USB devices disabling the USB power line is the same as unplugging the USB device. The "condom" approach with disabling the data lines is a bit better, but solves things mostly with USB plugging into public charging stations. The TPS2540 solution is USB charging current negotiator – with no datalines connected. A dedicated (micro-USB) charging port solves this problem.  
+
Internal USB devices can be switched off manually. This helps with the privacy – the microphone and webcam. For external USB devices disabling the USB power line is the same as unplugging the USB device. The "condom" approach with disabling the data lines is a bit better but solves things mostly with USB plugging into public charging stations. The TPS2540 solution is a USB charging current negotiator – with no data lines connected. A dedicated (micro-USB) charging port solves this problem.  
 
The already developed Balthazar PSU-charger has this option.
 
The already developed Balthazar PSU-charger has this option.
  
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[[File:BalthazarIOusb 0.png|thumb|center]]
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<gallery>
 +
File:BalthazarIOusb 0.png|thumb|top
 +
File:BalthazarIOusb 2.png|thumb|side
 +
File:BalthazarIOusb 1.png|thumb|bottom
 +
File:Psiousbctop.png|thumb|top
 +
File:Psiousbcbott.png|thumb|bottom
 +
</gallery>
  
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[[File:BalthazarIOusb 2.png|thumb|center]]
 
  
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[[File:BalthazarIOusb 1.png|thumb|center]]
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PCB is ready for a prototype as KiCad files are available at our [https://github.com/balthazar-space Github] pages.
  
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Those will be regularly updated as schematics and PCBs are continuously improved and optimized.
  
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=== BalthazarPSU2 + I/O unifying board ===
  
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PCB ready for prototype as KiCad files are available at our [https://github.com/balthazar-space Github] pages.
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Top and bottom views of an integrated I/O hub with USB
 +
 
 +
<gallery>
 +
File:BalthazarIO1PSU2.png|thumb|top
 +
File:BalthazarIO2PSU2.png|thumb|bottom
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</gallery>
 +
 
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In a top view with the first chip on the left is a Texas Instruments BQ24193 that acts as a buck-boost converter/ battery charger,
 +
another chip is a Texas Instruments TPS63020 for an internal power acting as buck-boost converters (for 3.3V and 5V)
 +
Onboard is also Diodes Incorporated PAM8403 enabling 3W class-D audio amplifier while Microchip USB2514 is used as a USB 2.0 four-port hub.
 +
 
 +
For more on schematics, elements, bills of materials visit our [https://github.com/balthazar-space/balthazarPSU2 Github] page.
 +
 
 +
Go to:
 +
[[Keyboard|Keyboard]] or [[Power_Supply|Power Supply]]

Latest revision as of 21:09, 10 October 2021

Balthazar I/O USB board

IO-board means connectivity with peripheral devices. These can be seen as on-board and out-board. On-board devices include keyboard + trackpad, webcam, and optional audio card. USB is the usual solution for this. Here for the onboard periphery, a simple USB 2.0 hub is enough. The main mini-computer board usually provides a much better hub for 4 downstream USB devices. At this point, this is still mainly USB 2.0. Of course, some type of mass storage/system disk would be needed: microSD – and especially versions of SSD (SATA or PCIe) – directly or via USB adapter. This would benefit a faster USB port – USB3.x (part of the mini-computer system-on-chip) – or PCIe bus.

Our solution for internal hub:

We chose the GL850G (ssop28-pin) four-port USB 2.0 hub chip with additional two pieces of AIC1526-0 dual USB high-side switch – to switch-off/on manually. It is a well-proven design. Hub will be powered via the upstream port – connected to the mini-computer board. Internal USB periphery power demands are predictable = low, so the usual 500mA limit for the hub is ok. The keyboard + touchpad combination is USB1.1 protocol, webcam, and optional audio card are USB2.0.

SchemeUSB.png

Internal USB devices can be switched off manually. This helps with the privacy – the microphone and webcam. For external USB devices disabling the USB power line is the same as unplugging the USB device. The "condom" approach with disabling the data lines is a bit better but solves things mostly with USB plugging into public charging stations. The TPS2540 solution is a USB charging current negotiator – with no data lines connected. A dedicated (micro-USB) charging port solves this problem. The already developed Balthazar PSU-charger has this option.

  • top

  • side

  • bottom

  • top

  • bottom


PCB is ready for a prototype as KiCad files are available at our Github pages.

Those will be regularly updated as schematics and PCBs are continuously improved and optimized.

BalthazarPSU2 + I/O unifying board

Top and bottom views of an integrated I/O hub with USB

  • top

  • bottom

In a top view with the first chip on the left is a Texas Instruments BQ24193 that acts as a buck-boost converter/ battery charger, another chip is a Texas Instruments TPS63020 for an internal power acting as buck-boost converters (for 3.3V and 5V) Onboard is also Diodes Incorporated PAM8403 enabling 3W class-D audio amplifier while Microchip USB2514 is used as a USB 2.0 four-port hub.

For more on schematics, elements, bills of materials visit our Github page. 

Go to: 
Keyboard or Power Supply
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