Differences

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--- gca-pi08-en [2018/11/12 08:56] – external edit 127.0.0.1
+++ gca-pi08-en [2021/09/04 08:52] (current) – [How to find out which pcb I have?] rjversluis
@@ Line 3: / Line 3: @@
 [[english|{{  rocrail-logo-35.png}}]][[:rocnet:rocnetnode-en|{{ :rocnet:rocnet-hw.png}}]]
 [[english|Content]] -> [[hardware-en|Hardware]] -> [[hardware-en#raspberry_pi_rocnet|GCA-RasPi]]
-  * [[GCA1-PI01-en|GCA-PI01]] | **[[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]]
   * [[:rocnet:rocnetnode-en|RocNetNode]]
@@ Line 22: / Line 22: @@
 On board, there is space for two led bars, to indicate the functioning of each ouput.\\
 These leds do not needed installation if you see no purpose there.\\
-The resistor arrays RP1 and RP2 need to be adapted to the voltage as suppluied to the GCA_PI08, so these arrays will be mounted in sockets, making it simple to change if needed.\\
+The resistor arrays RP1 and RP2 need to be adapted to the voltage as supplied to the GCA_PI08, \\
+so these arrays will be mounted in sockets, making it simple to change if needed.\\
 Also, because of the hight Voltage of 40V max, each port can drive a large serial train of leds, using only one \\
 serial resistor in each chain.\\
 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.\\
-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 \\
    * for power in of max 40 V dc (V+, V-)
@@ Line 38: / Line 39: @@
 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.\\
-|  {{: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\\
 can handle a current of at least 1,5 amp att each pin and is very rigid.\\
-All you to buy a crimping tools, available from GCA for € 20.\\
+All you need to buy is a crimping tools, available from GCA for € 20.\\
 Once you have that settled, you can easily make you own cables in any length with the use of 0,25 mm wire.\\
 The kit will be delivered with standard PSK connectors.\\
@@ Line 58: / Line 59: @@
 \\
+==== 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.\\
@@ Line 74: / Line 100: @@
 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.\\
-Future boards version 2 will have a prptection for that, but for now, be sure to discharge the capacitor before changing the jumper position.\\
+Version 2 has a protection for that.\\
+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.\\
@@ Line 82: / Line 110: @@
-===== 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 =====
 The on-board chip is connected to 5 V of the RocNet bus.\\
@@ Line 95: / Line 118: @@
 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 =====
@@ Line 108: / Line 133: @@
 This board comes , as from factory, with all adresses left open.\\
-The opictures shows the four adresses connected to 0V meaning that thus chip is adreesed to &H060.\\
+The picture shows the four adresses connected to 0V meaning that this chip is addressed to &H060.\\
-Logic '1' to be selected by connecting the two pads of the correspondent number, insead of the bottom two.\\
+Logic '1' to be selected by connecting the two top pads of the correspondent number, instead of the bottom two.\\
 ^  Address settings  ^^^^^^
 |  Address  |  A0  | A1  | A2  | A3  |  Leds #  |
@@ Line 129: / Line 154: @@
 |     6E     |  0  |  1  |  1  |  1  |  225..240   |
 |     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}}