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# HMD Fusion Development Toolkit V3.0
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> AI Generated from ChatGPT processing the [Official PDF Document](./resources/HMD_Fusion_Development_Toolkit_-_V3_-_March_2025.pdf)
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_March 2025_
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## Introduction
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Our ambition is for HMD Fusion to provide a platform for innovation for businesses, startups, communities, and people around the world — making new applications of smartphone technology more accessible and flexible for everyone.
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HMD Fusion features next-generation design innovation, including built-in hardware connectors that enable endless new applications, known as "smart outfits."
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Examples of smart outfits:
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- A case with a cover that removes the constant interruption of digital notifications.
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- A retail payment terminal to scan barcodes and accept payments.
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- Many more ideas to create.
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With HMD Fusion, we are introducing a radically new and innovative approach to smartphones and their capabilities.
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> **Note:** This version includes final physical dimensions for HMD Fusion. It’s recommended to use a physical device to measure and test engineering/fabrication tolerances.
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Join the community: [HMD Discord](https://bit.ly/hmddiscord)
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---
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## Design Specs
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HMD Fusion is a streamlined computing core at its heart, creating space for endless new and innovative applications.
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**3D Files:**
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We provide 3D source files of the HMD Fusion outline and an example smart outfit for use in your preferred 3D software.
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- Download 3D files: [HMD Fusion APK Example 3D Files](https://downloads.ctfassets.net/wcfotm6rrl7u/aYYPsnBfWn8gKP5i2aqJT/c545b32631f5d97a700cff13dd82eaca/HMD_Fusion_APK_example_3D_files_V2-_September_2024.zip)
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**Physical Dimensions:**
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- Width: 75.5 mm
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- Height: 164.15 mm
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- Depth: 8.3 mm
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---
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## Interface
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HMD Fusion includes six electrical connector pins arranged in a single horizontal row for hardware interfacing using smart "pogo pin" mechanisms.
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- Pins #1–#5: USB 2.0 interface (data transfer).
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- Pin #6: ADC (analog-to-digital converter) detection.
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**USB 2.0 Interface:**
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- Supports **USB host** and **accessory** modes.
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---
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## Hardware Details
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**Power Specifications:**
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- In "Charging Mode": Smart outfit provides up to **15W** to HMD Fusion.
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- In "Power Mode": HMD Fusion provides up to **5W** to smart outfit.
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**ADC Value Detection:**
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- Eighteen (18) unique values can be communicated via the ADC pin.
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- Example: Smart outfit triggers device behavior (like changing wallpaper).
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**Download Demo APK:**
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[HMD Fusion ADC Demo APK](https://downloads.ctfassets.net/wcfotm6rrl7u/aYYPsnBfWn8gKP5i2aqJT/c545b32631f5d97a700cff13dd82eaca/HMD_Fusion_APK_example_3D_files_V2-_September_2024.zip)
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**Sample Java Code (Read ADC Pin):**
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```java
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private static final String smart_avc = "cat /sys/bus/iio/devices/iio:device0/in_voltage_pm6450_smart_adc_therm_input";
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String res = "";
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try {
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Process process = Runtime.getRuntime().exec(smart_avc);
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process.waitFor();
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BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
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String line;
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while ((line = reader.readLine()) != null) {
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res += line;
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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try {
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String str = "Smart avc:" + res;
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smartAvc.setText(str);
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} catch (IOException e) {
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e.printStackTrace();
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}
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```
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---
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## Power Management
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**VBUS Power Management:**
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- Controlled automatically based on screen status or via APIs.
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- **Screen off:** VBUS power off after 10 minutes.
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- **Screen on:** VBUS power on immediately.
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**Manage VBUS Status (Java Example):**
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```java
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private void sendVbusControlIntent(boolean turnOn) {
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String action = turnOn ? ACTION_TURN_ON_VBUS : ACTION_TURN_OFF_VBUS;
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Intent intent = new Intent(action);
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intent.putExtra(EXTRA_FORCE_BYPASS, true);
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sendBroadcast(intent);
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}
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```
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Check status:
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```java
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String status = Settings.Global.getString(this.getContentResolver(),"show_vbus_status");
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```
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---
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## Android & USB 2.0 APIs
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HMD Fusion will ship with Android 14.
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**Supported modes:**
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- **Host Mode:** HMD Fusion device acts as USB host.
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- **Accessory Mode:** Smart outfit acts as USB device.
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**Reference Links:**
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- [Android USB Host and Accessory Overview](https://developer.android.com/reference/android/hardware/usb/package-summary)
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- [AOA 2.0 Documentation](https://source.android.com/docs/core/interaction/accessories/aoa2)
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- [Android USB Development](https://developer.android.com/develop/connectivity/usb)
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---
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## Have Questions?
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**Join the HMD Discord Community:**
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[Join HMD Discord](https://bit.ly/hmddiscord)
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**Business or Commercial Partnership Inquiry:**
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[Contact HMD Solutions](https://solutions.hmd.com/contact-us)
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**Brand Collaboration Inquiry:**
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[Brand Collaboration Contact](https://www.hmd.com/en_int/collaborations-contact)
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---
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## Terms of Use
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_Effective March 3, 2025_
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- **License:** Permitted use for designing smart outfits.
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- **Restrictions:** No reverse engineering, sublicensing, or publishing code.
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- **Termination:** Immediate if terms are breached.
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- **Feedback:** HMD may freely use feedback without compensation.
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- **Warranty:** Toolkit is provided "AS-IS."
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- **Liability:** HMD is not liable for damages; limited liability where applicable.
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- **Governing Law:** Finnish law, courts of Helsinki, Finland.
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---
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