docs: 📝 research stm32 (#2)

docs/Scopes/Micro/Connectivity.md

@@ -9,4 +9,5 @@ I want to learn more about the various wireless/connectivity protocols/options a
 - [[Bluetooth]]
 - [[IEEE 802.11]]
 - [[IEEE 802.15.4]]
+- [[LoRa]]
 - [[Application Layers]]

docs/Scopes/Micro/Requirements.md

@@ -36,7 +36,9 @@ I will need at least one [[Watchdog Timer]].
 
 It would be desirable to have in-built [[USB Power Delivery]] PHY support, such that I do not require an external PD controller IC.
 
-[power supply - Implementing USB-C PD PHY directly into micro-controller - Electrical Engineering Stack Exchange](https://electronics.stackexchange.com/questions/649227/implementing-usb-c-pd-phy-directly-into-micro-controller)
+> [!todo]
+> - [power supply - Implementing USB-C PD PHY directly into micro-controller - Electrical Engineering Stack Exchange](https://electronics.stackexchange.com/questions/649227/implementing-usb-c-pd-phy-directly-into-micro-controller)
+> - [STM32 solutions for USB Type-C and Power Delivery - STMicroelectronics](https://www.st.com/content/st_com/en/ecosystems/stm32-usb-c.html?icmp=tt18626_gl_lnkon_nov2020)
 
 ### Connectivity
 

docs/Scopes/Micro/STM32.md

@@ -2,5 +2,115 @@
 
 # STM32
 
-> [!todo]
-> [STM32 WiFi - What are your Options? - PCB Artists](https://pcbartists.com/design/embedded/stm32-wifi-options/)
+Having narrowed down on a STM32 microcontroller for this project after having considered (and decided against) a [[PSoC 6]], [[ESP8266]], and [[ESP32]], I will use the [STM32 MCU product selector](https://www.st.com/content/st_com/en/stm32-mcu-product-selector.html) to narrow down to a specific microcontroller that satisfies my [[Requirements|requirements]].
+
+I also found in [[ARM Cortex Processors]] that any Cortex-M will suffice for my processor requirements, where M4/M7 cores may be nicer for their greater hardware features/memory caches, but I may also wish to prioritise the lower power consumption of the M0/M0+ cores.
+
+Although I already have prior experience with the `STM32U575`/`STM32U585`/`STM32F779`, I will start the selection process from the beginning to get a better familiarity with the breadth of product offerings.
+
+## STM32 Microcontrollers
+
+![[Pasted image 20231118002949.png]]
+
+From the above brochure image, I see that there are four primary categories of STM32 microcontrollers—high performance, mainstream, ultra-low-power, and wireless.
+
+### High Performance
+
+- Industrial
+	- PLCs
+	- Motor control
+	- Pumps and compressors
+
+- Smart home
+	- Smart appliances
+	- Central alarm system
+
+- Personal electronics
+	- Keyboards
+	- Smartphones
+	- IoT tags and tracking devices
+
+- Smart city
+	- Industrial communication
+	- Lighting controls
+	- Digital power
+
+- Medical and healthcare
+	- CPAP and respirators
+	- Dialysis machines
+
+| Series    | Processor | Maximum Clock Frequency | Remarks                                                                              |
+| --------- | --------- | ----------------------- | ------------------------------------------------------------------------------------ |
+| `STM32H5` | M33       | $250\,\text{MHz}$       | 'Best combination of performance, security, and affordability'                       |
+| `STM32F4` | M4        | $180\,\text{MHz}$       | 'Industry's highest benchmark scores for Cortex-M-based microcontrollers'            |
+| `STM32F2` | M3        | $120\,\text{MHz}$       | 'Unprecedented trade-off between price and performance'                              |
+| `STM32F7` | M7        | $216\,\text{MHz}$       | 'Deliver the maximum theoretical performance of the Cortex-M7 core'                  |
+| `STM32H7` | M7        | $550\,\text{MHz}$       | Dual-core, 'Industry's highest benchmark scores for Cortex-M-based microcontrollers' | 
+
+![[Pasted image 20231118004617.png]]
+
+### Mainstream
+
+| Series    | Processor | Maximum Clock Frequency | Remarks                                                                                                                               |
+| --------- | --------- | ----------------------- | ------------------------------------------------------------------------------------------------------------------------------------- |
+| `STM32C0` | M0+       | $48\,\text{MHz}$        | 'Most cost-effective'                                                                                                                 |
+| `STM32G0` | M0+       | $64\,\text{MHz}$        | 'Address cost-sensitive applications and bring better performance while lowering power consumption'                                   |
+| `STM32F0` | M0        | $48\,\text{MHz}$        | 'Ideal for engineers looking to future proof their product platform'                                                                  |
+| `STM32F1` | M3        | $72\,\text{MHz}$        | 'Pioneer of the STM32 family', 'high performance with first-class peripherals'                                                        |
+| `STM32F3` | M4        | $72\,\text{MHz}$        | 'Enables the most demanding real-time control for consumer and industrial applications', 'rich choice of advanced analog peripherals' |
+| `STM32G4` | M4        | $170\,\text{MHz}$       | 'Addresses all applications that require an advanced and/or rich analog peripheral set combined with a high-performance CPU'          |
+
+![[Pasted image 20231118004851.png]]
+
+### Ultra Low Power
+
+- Industrial
+	- Advanced HMI
+	- POS machines
+	- Metering
+	- Sensors
+	- Medical and healthcare
+
+- Smart home
+	- Home applicances
+	- Whiteware
+
+- Personal electronics
+	- e-Bikes
+	- EV charging
+	- Wearables
+	- Audio
+
+| Series     | Processor | Maximum Clock Frequency | Remarks |
+| ---------- | --------- | ----------------------- | ------- |
+| `STM32U5`  | M33       | $160\,\text{MHz}$       |         |
+| `STM32L5`  | M33       | $110\,\text{MHz}$       |         |
+| `STM32L4`  | M4        | $80\,\text{MHz}$        |         |
+| `STM32L4+` | M4        | $120\,\text{MHz}$       |         |
+| `STM32L0`  | M0+       | $32\,\text{MHz}$        |         |
+
+![[Pasted image 20231118005601.png]]
+
+### Wireless
+
+- 'Enable wireless connectivity'
+- Dual-core architecture—MCU and a radio transceiver
+
+- Industrial
+- Smart home
+- IoT
+
+| Series     | Processor  | Maximum Clock Frequency               | Remarks                                                                                     |
+| ---------- | ---------- | ------------------------------------- | ------------------------------------------------------------------------------------------- |
+| `STM32WBA` | M33        | $100\,\text{MHz}$                     | [[Bluetooth Low Energy]] 5.4                                                                |
+| `STM32WB`  | M4 and M0+ | $64\,\text{MHz}$ and $32\,\text{MHz}$ | [[Bluetooth Low Energy]] 5.4, [[IEEE 802.15.4]] ([[Zigbee]] and [[Thread]]) with [[Matter]] |
+| `STM32WB0` | M0+        | $64\,\text{MHz}$                      | Low-power [[Bluetooth Low Energy]] 5.3                                                      |
+| `STM32WL`  | M4 and M0+ | $48\,\text{MHz}$                      | [[LoRa]]                                                                                    |
+
+![[Pasted image 20231118010006.png]]
+
+### Evaluation
+
+Before looking into the product selector, it looks as though I could find suitable microcontrollers in the [[STM32#Mainstream|Mainstream]], [[STM32#Ultra Low Power|Ultra Low Power]], or [[STM32#Wireless|Wireless]] categories—with the two former requiring some external [[Connectivity|connectivity]] module to meet my wireless [[Requirements|requirements]].
+
+Of all the series, the `STM32WB` looks to be the most initially attractive, as this appears to fully satisfy my connectivity & processor requirements without requiring an external module. I will need to investigate further to see whether it satisfies the other microcontroller (ie peripheral) [[Requirements|requirements]] however.