WIP

micro-ihsm-hw/Electrooptics.ipynb

@@ -0,0 +1,84 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "191cdc91-de49-41a5-87f3-3283d939d150",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import numpy as np\n",
+    "from matplotlib import pyplot as plt\n",
+    "from scipy import signal as sig\n",
+    "\n",
+    "%matplotlib inline"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "id": "c0ea3fcc-aaae-4dbf-a637-f3f1e122d12b",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "LED optical power: 24.000 mW\n",
+      "LED power density at photodiode surface: 0.007 mW/cm^2\n",
+      "Photodiode reverse current: 14.106 nA\n",
+      "Photodiode background reverse current: 2.000 µA\n",
+      "voltage bit depth: 7.148 bit\n"
+     ]
+    }
+   ],
+   "source": [
+    "light_current_efficiency = 2 # worst case, µA @ 1mW/cm^2, @950 nm, @V_R = 5V\n",
+    "light_current_efficiency *= 1e-6 * 1e3 / (100**2) # normalize units -> A * m^2 / W\n",
+    "\n",
+    "led_voltage = 1.2 # infrared LED\n",
+    "led_current = 0.05 # ampere\n",
+    "led_power = led_voltage * led_current\n",
+    "led_efficiency = 0.4 # guess\n",
+    "led_optical_power = led_power * led_efficiency\n",
+    "print(f'LED optical power: {led_optical_power*1e3:.3f} mW')\n",
+    "\n",
+    "led_distance = 0.03 # meter\n",
+    "led_angle = 160 # degree, full angle\n",
+    "led_irradiated_area = led_distance * np.tan(np.radians(led_angle/2)) * 2\n",
+    "led_power_density = led_optical_power / led_irradiated_area # led power at receiver photodiode plane, W/m^2\n",
+    "print(f'LED power density at photodiode surface: {led_power_density * 1e3 / 1e4:.3f} mW/cm^2')\n",
+    "\n",
+    "pd_current = led_power_density * light_current_efficiency\n",
+    "print(f'Photodiode reverse current: {pd_current*1e9:.3f} nA')\n",
+    "\n",
+    "indoor_light = 10 # W / m^2\n",
+    "pd_background_current = indoor_light * light_current_efficiency\n",
+    "print(f'Photodiode background reverse current: {pd_background_current*1e6:.3f} µA')\n",
+    "\n",
+    "print(f'Equivalent voltage bit depth: {np.log2(pd_background_current/pd_current):.3f} bit')"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.13.1"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}

micro-ihsm-hw/micro-ihsm-hw.kicad_prl

@@ -1,6 +1,6 @@
 {
   "board": {
-    "active_layer": 0,
+    "active_layer": 2,
     "active_layer_preset": "All Layers",
     "auto_track_width": true,
     "hidden_netclasses": [],
@@ -17,7 +17,7 @@
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     "selection_filter": {
       "dimensions": false,
-      "footprints": false,
+      "footprints": true,
       "graphics": false,
       "keepouts": false,
       "lockedItems": false,

micro-ihsm-hw/micro-ihsm-hw.kicad_sch

@@ -7541,6 +7541,17 @@
 		)
 		(uuid "018cc315-e0e9-409e-8aa2-1b74b74101ad")
 	)
+	(text "Note: LINK_LED_OUT is on PB9\nto use I2C FM+ 20mA sink\ndriver for increased current"
+		(exclude_from_sim no)
+		(at 228.092 433.324 0)
+		(effects
+			(font
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+			(justify right top)
+		)
+		(uuid "1a0f8da3-c400-45df-86a0-82b1cba33fb2")
+	)
 	(text "DC bias characteristics of those 10µF caps:"
 		(exclude_from_sim no)
 		(at 741.934 309.88 0)
@@ -7715,7 +7726,7 @@
 		)
 		(uuid "c61b2f70-41a4-46c7-a4e6-0a18327309ae")
 	)
-	(text "Opamp 3, 5 configured in PGA mode\nwith external bias, output to ADC\n\nOpamp 6 configured in follower mode,\ninput from DAC3, output to VOUT pin"
+	(text "Opamp 1 configured in PGA mode,\nfor photodiode AGC, output to UART RX\nvia PCB jumper\n\nOpamp 3, 5 configured in PGA mode\nwith external bias, output to ADC\n\nOpamp 6 configured in follower mode,\ninput from DAC3, output to VOUT pin"
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+					(unit 3)
+				)
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 		(pin "32"
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+			(alternate "USART1_RX")
 		)
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@@ -23074,6 +23417,7 @@
 		)
 		(pin "9"
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@@ -23097,6 +23441,7 @@
 		)
 		(pin "10"
 			(uuid "dfcf23ae-c1c2-4558-b29b-ed66a4094eee")
+			(alternate "OPAMP1_VOUT")
 		)
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@@ -23136,9 +23481,11 @@
 		)
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+		(property "Description" "50-MHz, Low-Power, Rail-to-Rail Output CMOS Operational Amplifier for Cost Sensitive Systems"
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+			(uuid "20224ba0-56e7-4d39-be17-a0762b45dff7")
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+		(instances
+			(project "micro-ihsm-hw"
+				(path "/cbb3a085-7921-4026-b761-6add0034045e"
+					(reference "U18")
+					(unit 2)
+				)
+			)
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 	(symbol
 		(lib_id "power:+3.3VP")
 		(at 769.62 349.25 0)
@@ -25296,6 +25730,71 @@
 			)
 		)
 	)
+	(symbol
+		(lib_id "power:GND")
+		(at 384.81 330.2 0)
+		(unit 1)
+		(exclude_from_sim no)
+		(in_bom yes)
+		(on_board yes)
+		(dnp no)
+		(uuid "69cba79e-d4ee-4bdc-91a7-eae821ecc3ea")
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+			(effects
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+				(hide yes)
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+		(property "Description" "Power symbol creates a global label with name \"GND\" , ground"
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+			(effects
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+			(uuid "e69855a4-a432-4846-9f41-8c80e92d530b")
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+			(project "micro-ihsm-hw"
+				(path "/cbb3a085-7921-4026-b761-6add0034045e"
+					(reference "#PWR0120")
+					(unit 1)
+				)
+			)
+		)
+	)
 	(symbol
 		(lib_id "power:GND")
 		(at 280.67 360.68 0)
@@ -28194,6 +28693,73 @@
 			)
 		)
 	)
+	(symbol
+		(lib_id "Connector:TestPoint")
+		(at 300.99 378.46 270)
+		(unit 1)
+		(exclude_from_sim no)
+		(in_bom yes)
+		(on_board yes)
+		(dnp no)
+		(fields_autoplaced yes)
+		(uuid "933240ae-bc66-44a7-9422-303ad38854b8")
+		(property "Reference" "TP2"
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+			(effects
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+			(project "micro-ihsm-hw"
+				(path "/cbb3a085-7921-4026-b761-6add0034045e"
+					(reference "TP2")
+					(unit 1)
+				)
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 	(symbol
 		(lib_id "power:+3.3VP")
 		(at 328.93 184.15 0)