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FCUSB CLASSIC PCB 2.2

D3m0n

Administrator
Staff member
#1
New features / changes from PCB 2.1:

1) New power system capable of driving 3.3v @ 1000ma (previous version was 150ma). This is enough power to self-power most circuits/motherboards.

2) A N-Channel MOSFET has been added to the power pin that adds reverse current protection as well as auto-shutdown without adding risk to the FCUSB board.

3) Switch #1 can now be used to disable the VCC pin on the header. This can be used for in-circuit operation where only the SPI/GND pins are used and the VCC pin is already active. Or for SOIC clips connecting to live system/chips.

4) A 4 pin port (0.1" spacing) has been added which has GND +5V and +3.3V. Useful for power additional circuits using the new FCUSB's on board regulator.

amanmipojbcddhhi.png
 
#2
I will definitely be upgrading!!!

Is there also a 1.8v pin like the v2.x has? (I count 4)

The SOIC connection to "live system/chips" does this mean we will be able to read and write to powered up devices?
 
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Pantheon

Member
Developer
#3
PCB 2.1 used a small 3.3/1.8 voltage output regulator, this has been replaced by a LM3940 regulator. This is a huge difference, as the output is now 1A, which was very difficult to redesign, as all of the power traces had to be increased and seepage was taken into consideration. The power routing had to be changed as well, as before the 150ma current was being routed through the slide switch, but now the slide switch is switch a high-side power transistor (as 1A going through the physical connector would melt it).

With 1A output power, you can self-power almost any modern board (in lab testing, entire MSI motherboards were powered using the VCC of FCUSB 2.2).

Before, if you were using a SOIC clip on a board that already had power, you could not also connect the VCC, but with a clip that was difficult, since the VCC pin was inside the connector. But now if you look at the board, you can see there is a (V) marking next to pin 1 of the top switch. Moving this to the OFF position will disable the VCC pin and allow it to be connected to an existing VCC source (which will be reversed blocked, like a diode).

FCUSB 2.2 was designed for in-circuit use in mind. This will be the preferred solution for ISP.
 
#4
PCB 2.1 used a small 3.3/1.8 voltage output regulator, this has been replaced by a LM3940 regulator. This is a huge difference, as the output is now 1A, which was very difficult to redesign, as all of the power traces had to be increased and seepage was taken into consideration. The power routing had to be changed as well, as before the 150ma current was being routed through the slide switch, but now the slide switch is switch a high-side power transistor (as 1A going through the physical connector would melt it).

With 1A output power, you can self-power almost any modern board (in lab testing, entire MSI motherboards were powered using the VCC of FCUSB 2.2).

Before, if you were using a SOIC clip on a board that already had power, you could not also connect the VCC, but with a clip that was difficult, since the VCC pin was inside the connector. But now if you look at the board, you can see there is a (V) marking next to pin 1 of the top switch. Moving this to the OFF position will disable the VCC pin and allow it to be connected to an existing VCC source (which will be reversed blocked, like a diode).

FCUSB 2.2 was designed for in-circuit use in mind. This will be the preferred solution for ISP.
Thanks for the info, I guess we will soon see the same thing in the Pro version?

In-circuit SPI programming may help with SPI devices that for some reason you can only program them if you desolder the chip from the board, no matter how much power you throw at these they will not detect when in place. I have a couple of these devices (one example is the Unifi AP-LR)
 

Pantheon

Member
Developer
#6
Due to the high demand and initial production run, you will need to contact EC and request a unit, or purchase one from a reseller.
 

guestus

New Member
#7
Hi. I have 1.8 hw version. now i need to read i2c eeprom. Can you help me with pinout? What atmel's pins used for sda & scl lines on 2.X HW?
 
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D3m0n

Administrator
Staff member
#8
To quote from the fcusb manual

"To program a I2C or TWI compatible EEPROM device, FlashcatUSB must be loaded with
AVR firmware 4.01 or newer. Notice, this feature is only available on PCB 2.x and 3.x and will
not work with older PCB 1.x boards
."
 

guestus

New Member
#9
Thank's. I know that. I asked about pins used on atmel for this. Same MC is used in 1.x & 2.x hardware.
 
#10
i have 2.2 and i cannot flash sb5101,chip hes detect but the bcus 2.2 gives me write error,cannot even flash sector 1 !!
 
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