Documentation updates.

Also moved a wire on the IO page, and amended some doc comments
in the schematic. Notably the Power Input limit is now 30V because
of the Zener on the control line.

Author: jonathanpallant

CHANGELOG.md

@@ -2,9 +2,27 @@
 
 # Unreleased Changes
 
-* Fixed https://github.com/Neotron-Compute/Neotron-Pico/issues/43
-* Re-arranged Q801 and Q802 on PCB layout, but labelled them as PNP and NPN to avoid
-  confusion.
+* Re-arranged top-sheet
+* Two PSU control BJTs are now surface mount
+* Support 5V DS1307+ as well as 3.3V MCP7940N Real Time Clock
+* Use 200mA Holtek HT7533-1 stand-by regulator
+* Swapped MCP23S17 for MCP23S18 (because that's what's available)
+* Added internal 12V input header
+* K7805-3AR3 control pin is protected with a zener (allows higher input voltages)
+* Changed K7805-3AR3 to have ceramic output cap (#84)
+* Remove all the Octopart CPL references (#83)
+* Increased VGA DAC current (#77)
+* Replace 74HC245 with 74HC138, plus five LEDS for the now spare pins (#65)
+* Added missing I²C pull-ups (#61)
+* Change I²S pinout to match Raspberry Pi demo board (#60)
+* Pulled CODEC's CS pin (#59)
+* Added pull-ups to all SPI CS lines (#58)
+* VGA ESD protection chip has bypass pins for when not fitted (#51)
+* Case LEDs driven from 12V supply (#46)
+* Fixed dead short through PSU Control BJTs (#43)
+* Adds 6mm switches for power and reset (#42)
+* Added internal 5V/3.3V output header (#41)
+* Reverse polarity protection on the input (#40)
 
 # [Version v0.5.2](https://github.com/Neotron-Compute/Neotron-Pico/releases/tag/v0.5.2)
 

Kicad/io_exp.kicad_sch

@@ -729,7 +729,7 @@
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     (uuid 1183a8c4-7aab-4299-82d0-c9663ad70630)
   )
-  (wire (pts (xy 180.34 95.25) (xy 182.88 95.25))
+  (wire (pts (xy 180.975 95.25) (xy 182.88 95.25))
     (stroke (width 0) (type default) (color 0 0 0 0))
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@@ -775,7 +775,7 @@
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     (uuid 26a15d3b-2624-41a2-9f9d-95a533c92823)
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-  (wire (pts (xy 195.58 106.68) (xy 195.58 105.41))
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@@ -1052,7 +1052,7 @@
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     (uuid c95e421a-8139-426c-b7ed-78a5c5dab9d0)
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@@ -1206,8 +1206,8 @@
     (uuid fef57212-17b4-4dbb-a966-29da8798eeed)
   )
 
-  (text "We use the MCP23S18 here, because\nyou can buy it and the S17 is out\nof stock everywhere.\n\nThe S18 has open-drain outputs, but\nevery output here is either pulled-up,\nor is a low-side switch."
-    (at 66.04 123.19 0)
+  (text "We use the MCP23S18 here, because\nyou can buy it and the S17 is out\nof stock everywhere. Either will\nwork fine.\n\nThe S18 has open-drain outputs, but\nevery output here is either pulled-up,\nor is a low-side switch."
+    (at 66.04 126.365 0)
     (effects (font (size 1.27 1.27)) (justify left bottom))
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-  (text "V_{f} = 2.1V\nI_{LED} = (3.3 V - V_{f}) / ${af18a52d-4b4e-46cd-a208-cf84961d451d:VALUE} Ω\nI_{LED} = 5.5 mA"
+  (text "V_{f} = 2.1 V\nI_{LED} = (3.3 V - V_{f}) / ${af18a52d-4b4e-46cd-a208-cf84961d451d:VALUE} Ω\nI_{LED} = 5.5 mA"
     (at 191.77 132.08 0)
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid c351bf87-d5e5-4590-8a55-3c1e6b583f57)
@@ -1445,33 +1445,33 @@
     (pin "9" (uuid 56e99b64-cb8e-40aa-bc9a-72ee5431df33))
   )
 
-  (symbol (lib_id "power:GND") (at 195.58 106.68 0) (unit 1)
+  (symbol (lib_id "power:GND") (at 195.58 107.95 0) (unit 1)
     (in_bom yes) (on_board yes)
     (uuid 00000000-0000-0000-0000-000060f11a9d)
-    (property "Reference" "#PWR0207" (id 0) (at 195.58 113.03 0)
+    (property "Reference" "#PWR0207" (id 0) (at 195.58 114.3 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Value" "GND" (id 1) (at 195.707 111.0742 0))
-    (property "Footprint" "" (id 2) (at 195.58 106.68 0)
+    (property "Value" "GND" (id 1) (at 195.707 112.3442 0))
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       (effects (font (size 1.27 1.27)) hide)
     )
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       (effects (font (size 1.27 1.27)) hide)
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     (pin "1" (uuid 9e32c56b-16d2-4327-b5ce-e4b924997e96))
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-  (symbol (lib_id "power:GND") (at 180.34 108.585 0) (unit 1)
+  (symbol (lib_id "power:GND") (at 180.975 107.95 0) (unit 1)
     (in_bom yes) (on_board yes)
     (uuid 00000000-0000-0000-0000-000060f121ef)
-    (property "Reference" "#PWR0205" (id 0) (at 180.34 114.935 0)
+    (property "Reference" "#PWR0205" (id 0) (at 180.975 114.3 0)
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     )
-    (property "Value" "GND" (id 1) (at 180.34 112.395 0))
-    (property "Footprint" "" (id 2) (at 180.34 108.585 0)
+    (property "Value" "GND" (id 1) (at 180.975 111.76 0))
+    (property "Footprint" "" (id 2) (at 180.975 107.95 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "" (id 3) (at 180.34 108.585 0)
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       (effects (font (size 1.27 1.27)) hide)
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     (pin "1" (uuid 163301a3-8e60-4437-9c75-8437342cce43))
@@ -2361,43 +2361,43 @@
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   )
 
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     (in_bom yes) (on_board yes)
     (uuid fc184354-7054-4583-a19d-50c974921fe4)
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       (effects (font (size 1.27 1.27)) (justify right))
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-    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (id 2) (at 182.118 103.505 90)
+    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (id 2) (at 182.753 103.505 90)
       (effects (font (size 1.27 1.27)) hide)
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-    (property "DNP" "0" (id 4) (at 180.34 103.505 0)
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       (effects (font (size 1.27 1.27)) hide)
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-    (property "MPN" "RMCF0805FT10K0" (id 6) (at 180.34 103.505 0)
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Kicad/powersupply.kicad_sch

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-  (text "DC Input rating:\n8V to 14V\n12V Nominal\nMax 2A\nReverse-polarity protected"
+  (text "DC Input rating:\n8V to 30V\n12V Nominal\nMax 2A\nReverse-polarity protected"
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