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gca-pi08-en [2018/12/04 14:50] – [GCA_PI08 16 channel module with max 40V 100 mA output per channel] rjversluisgca-pi08-en [2021/09/04 08:52] (current) – [How to find out which pcb I have?] rjversluis
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 [[english|{{  rocrail-logo-35.png}}]][[:rocnet:rocnetnode-en|{{ :rocnet:rocnet-hw.png}}]] [[english|{{  rocrail-logo-35.png}}]][[:rocnet:rocnetnode-en|{{ :rocnet:rocnet-hw.png}}]]
 [[english|Content]] -> [[hardware-en|Hardware]] -> [[hardware-en#raspberry_pi_rocnet|GCA-RasPi]] [[english|Content]] -> [[hardware-en|Hardware]] -> [[hardware-en#raspberry_pi_rocnet|GCA-RasPi]]
-  * [[GCA1-PI01-en|GCA-PI01]] | [[:rocnet:pi01can-en|PiCan_01]] | [[GCA_PI02-en|GCA-PI02]] | [[GCA-PI03-en|GCA-PI03]] | [[:gca-pi04-en|GCA-PI04]] | [[:gca-pi05-en|GCA-Pi05]] | [[:gca-pi06-en|GCA-Pi06]] | [[:GCA-PI07-en|GCA-PI07]] | **[[:GCA-PI08-en|GCA-PI08]]** |  [[:gca107-en|GCA107 Relay board]] | [[:rocnet:rocdisplay-en|RocDisplay]] | [[:rocnet:fastclock-en|Fast Clock]]+  * [[GCA1-PI01-en|GCA-PI01]] | [[:rocnet:pi01can-en|Pi01CAN]] | [[GCA_PI02-en|GCA-PI02]] | [[GCA-PI03-en|GCA-PI03]] | [[:gca-pi04-en|GCA-PI04]] | [[:gca-pi05-en|GCA-Pi05]] | [[:gca-pi06-en|GCA-Pi06]] | [[:GCA-PI07-en|GCA-PI07]] | **[[:GCA-PI08-en|GCA-PI08]]** |  [[:gca107-en|GCA107 Relay board]] | [[:rocnet:rocdisplay-en|RocDisplay]] | [[:rocnet:fastclock-en|Fast Clock]]
   * [[mgv-overview-en|The GCA modules]]   * [[mgv-overview-en|The GCA modules]]
   * [[:rocnet:rocnetnode-en|RocNetNode]]   * [[:rocnet:rocnetnode-en|RocNetNode]]
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 Each port can drive up to 100 mA max.\\ Each port can drive up to 100 mA max.\\
 The GCA_PI08 is part of the RocNet network, Rocrail provides of course all the setting options that are needed.\\ The GCA_PI08 is part of the RocNet network, Rocrail provides of course all the setting options that are needed.\\
-See  https://wiki.rocrail.net/doku.php?id=rocnet:rocnetnode-led-en .\\+See: __**[[:rocnet:rocnetnode-led-en|RocNetNode Pi08 LEDs]]**__ .\\
 The GCA_PI08 has a connection J3 \\ The GCA_PI08 has a connection J3 \\
    * for power in of max 40 V dc (V+, V-)    * for power in of max 40 V dc (V+, V-)
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 And all outputs are also available on a 20 pin flatcable header.\\ And all outputs are also available on a 20 pin flatcable header.\\
 This poor quality type of connector is not really favorite inside GCA boards, but is possible anyway.\\ This poor quality type of connector is not really favorite inside GCA boards, but is possible anyway.\\
-|  {{:gca:gca_pi08_pict_01.png?500}}  |  The drawing of the 69 x 63 mm board.  | +|  {{:gca:gca_pi08_pict_01.png?500}}  |  The drawing of version 1 69 x 63 mm board.  |\\ 
-\\+
 The standard used PSS 254/PSK254 connectors might be not the first choice of many railroaders, but consider that this connector\\ The standard used PSS 254/PSK254 connectors might be not the first choice of many railroaders, but consider that this connector\\
 can handle a current of at least 1,5 amp att each pin and is very rigid.\\ can handle a current of at least 1,5 amp att each pin and is very rigid.\\
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 \\ \\
 +==== How to find out which pcb I have? ====
 +\\
 +On version 1.x there is no C3 nor R3.\\
 +
 +\\
 +===== The version 1 hardware files =====
 + 
 +|  {{:gca:gca_pi08_sch.pdf|The schematic drawing}}  |
 +|  {{:gca:gca_pi08_pcb.pdf|The pc-board and parts positions}}  |
 +|  {{:gca:gca_pi08_gerber.zip|Gerber files for pcb}}  |
 +|  {{:gca:gca_pi08_parts.pdf|Bill of materials}}  |\\
 +\\
 +===== Version 2 =====
 +In the first edition, it was possible to damage the PC9622 chip, when suppply was changed from 15 to 5 Volt.\\
 +To avoid that, v2 has an extra capacitor.\\
 +\\
 +|  {{ :gca:gca_pi08_v2_sch.pdf  |  The schematic drawing  }}  |
 +|  {{ :gca:gca_pi08_v2_pcb.pdf |The pcb and parts positions}}  |
 +|  {{ :gca:gca_pi08_v2_parts.pdf  |  The bill of materials  }}  | 
 +\\
 +
 +
 +
 +
 +
  
-===== Important warnings !  ! ! =====+===== Important warnings for version 1 ! =====
  
 If you are using external power to be connected to J3, please be sure that this power is 100% isolated from anything else.\\ If you are using external power to be connected to J3, please be sure that this power is 100% isolated from anything else.\\
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 it appears that capacitor C2 is fully charged.\\ it appears that capacitor C2 is fully charged.\\
 Since there is no more drain for that capacitor, it will put the full charge into the 5V circuit,which will destroy the PCA9622 immediately.\\ Since there is no more drain for that capacitor, it will put the full charge into the 5V circuit,which will destroy the PCA9622 immediately.\\
-Future boards version will have a protection for that, but for now, be sure to discharge the capacitor before changing the jumper position.\\ +Version has a protection for that.\\ 
-One other option is to fix a resistor of +/- 2.2 KOhm between the + and - of the large Elco.\\+An option for version 1 is to fix a resistor of +/- 10 KOhm between the + and - of the large Elco.\\
 Just fit it at the bottom side of the pcb.\\ Just fit it at the bottom side of the pcb.\\
  
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-===== The hardware files ===== +
-|  {{:gca:gca_pi08_sch.pdf|The schematic drawing}} +
-|  {{:gca:gca_pi08_pcb.pdf|The pc-board and parts positions}} +
-|  {{:gca:gca_pi08_gerber.zip|Gerber files for pcb}}  | +
-|  {{:gca:gca_pi08_parts.pdf|Bill of materials}} +
-\\+
 ===== Jumper JP1 en power supply ===== ===== Jumper JP1 en power supply =====
 The on-board chip is connected to 5 V of the RocNet bus.\\ The on-board chip is connected to 5 V of the RocNet bus.\\
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 Indication on board shows the right settings for this jumper.\\ Indication on board shows the right settings for this jumper.\\
 \\ \\
-:!: **It must be absolutely certain that during operation the jumper between pin 2 and 3 may only be connected when capcitor C2 is discharged beforehand** :!: \\ +:!: **In version 1 it must be absolutely certain that during operation the jumper between pin 2 and 3 may only be connected when capacitor C2 is discharged beforehand.\\ 
-\\+In version 2 that action is protected. 
 +** :!: \\ 
  
 ===== Total possible led outputs in one RocNet setup ===== ===== Total possible led outputs in one RocNet setup =====
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 |     6E      0  |  1  |  1  |  1  |  225..240   | |     6E      0  |  1  |  1  |  1  |  225..240   |
 |     6F      1  |  1  |  1  |  1  |  241..256   | |     6F      1  |  1  |  1  |  1  |  241..256   |
 +==== a small correction needed ====
 +It appears that version 1 circuits are missing the internal ground connection with the two RJ12 connectors\\
 +That can easily be solved with the short wire bridge marked in this picture:\\
 +{{:gca:ground_patch.png?300}}
 +
 +
  
gca-pi08-en.1543931431.txt.gz · Last modified: 2018/12/04 14:50 by rjversluis