Ingenic T40 / Novatek NT98562 Low-Power Video SoC
Miniature Wearable Pov Camera
Aperçu
A compact cylindrical wearable POV action camera powered by a rechargeable lithium battery with local MicroSD card storage.
silei linArchitecture système
POWER
MCU
SENSOR
MODULE
MISC
ACTUATOR
- BATTERY → POWER_MANAGEMENTPowerSingle-cell Li-Ion battery power input to power management IC
- USB_INTERFACE → POWER_MANAGEMENTPower5V USB power input for battery charging
- POWER_MANAGEMENT → VIDEO_SOCPowerRegulated 3.3V system power rail
- POWER_MANAGEMENT → IMAGE_SENSORPowerRegulated analog and digital voltages for image sensor
- VIDEO_SOC → IMAGE_SENSORMIPIMIPI CSI-2 high-speed image data stream and I2C control bus
- VIDEO_SOC → STORAGESPI4-bit SDMMC high-speed interface for local video writing
- USB_INTERFACE → VIDEO_SOCUSBUSB 2.0 data communication for file transfer and mass storage mode
Nomenclature
| Référence | Type | Composant | Fabricant | Boîtier | Qté | Fiche technique | Correspondance |
|---|---|---|---|---|---|---|---|
| TPS63020 | POWER | TI TPS63020 Buck-Boost Regulator & Linear Charger Provides regulated system power from single-cell Li-Ion battery across full discharge curve and manages charging. | Texas Instruments / Monolithic Power Systems / STMicroelectronics | — | 1 | En attente | |
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| ICR14250 | POWER | Custom Cylindrical Li-Ion Battery (400mAh, 3.7V) Main power source for the wearable POV camera fitting the 18mm lipstick tube form factor. | EVE Energy / PKCell / Vapcell | — | 1 | En attente | |
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| T40N | MCU | Ingenic T40 / Novatek NT98562 Low-Power Video SoC Handles real-time video processing, ISP, and hardware H.264/H.265 encoding up to 1080p60. | Lumissil Microsystems | 356-LFBGA | 1 | Correspondant | |
| IMX335LQN-C | SENSOR | Sony IMX335 5MP CMOS Image Sensor Captures high-definition optical video frames with excellent low-light performance. | SONY | BGA-88 | 1 | Correspondant | |
| 104031-0811 | MODULE | MicroSD Card Socket with UHS-I Interface Provides user-replaceable high-capacity local storage for video files. | Molex | Reel | 1 | Correspondant | |
| USB4105-GF-A | MISC | USB Type-C Connector (USB 2.0 + Power) Used for battery charging and offloading recorded video data to a host computer. | Global Connector Technology | SMD | 1 | Correspondant | |
| THERMAL PAD 14.5X38X2.54 | ACTUATOR | Aluminum Alloy Enclosure with Internal Thermal Graphite Sheet Dissipates heat generated by the video SoC and provides splash-resistant mechanical rigidity. | Microsemi Corporation | — | 1 | Correspondant | |
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Guide de fabrication
6-8 hoursAdvanced
1
Procurement & Preparation
- Procure all BOM components including TPS63020, ICR14250 400mAh battery, T40N Video SoC, IMX335LQN-C image sensor, MicroSD socket 104031-0811, USB Type-C connector USB4105-GF-A, and the aluminum enclosure with thermal pad.
- Prepare the cleanroom/workstation with ESD mats, grounding wrist straps, and stencil alignment jigs for the multi-layer rigid-flex PCB tailored to the cylindrical lipstick tube form factor.
2
Hardware Assembly & Wiring
- Apply lead-free solder paste to the PCB pads using the custom cylinder stencil and place the TI TPS63020 Buck-Boost Regulator, Ingenic T40N Video SoC, and support passives onto the board.
- Solder the Sony IMX335 5MP CMOS Image Sensor to its dedicated rigid board section, ensuring the MIPI interface traces (MIPI_TX_D0P, MIPI_TX_D0N, MIPI_CLKP, MIPI_CLKN, MCLK, I2C_SDA, I2C_SCL) are clean and free of bridging.
- Integrate the MicroSD card socket (104031-0811) and USB Type-C connector (USB4105-GF-A) onto the PCB, routing SPI lines (SD_CLK, SD_CMD, SD_D0-D3) and USB lines (USB_DP, USB_DM, VBUS, GND).
- Connect the custom cylindrical ICR14250 400mAh Li-Ion battery to the power management module interface (VBAT, GND) and affix the thermal graphite sheet/pad onto the video SoC for optimal heat dissipation.
- Slide the assembled rigid-flex electronics stack into the aluminum alloy cylindrical enclosure, securing end caps and ensuring proper thermal contact between the graphite pad and the internal housing wall.
3
Firmware Setup
- Flash the bootloader and Linux-based camera firmware image onto the Ingenic T40 / Novatek NT98562 Video SoC via the USB Type-C interface or dedicated UART/SWD test pads.
- Configure the system device tree and driver modules for the Sony IMX335 sensor, enabling MIPI CSI-2 data lanes and setting up default 1080p60 video encoding pipelines.
4
Testing & Calibration
- Perform power-on self-test (POST) to verify that the TI TPS63020 regulator correctly outputs 3V3 and 2V8/1V8 rails across the battery discharge cycle and checks battery charging via VBUS.
- Insert a UHS-I MicroSD card into socket 104031-0811 and run read/write benchmark stress tests to ensure stable SPI/SDIO bus performance at high bitrates.
- Mount the camera on an optical test bench, focus the lens module onto a standard ISO 12233 chart, and calibrate ISP white balance, exposure, and sharpness parameters for the IMX335 sensor.
- Conduct a 30-minute continuous 1080p60 video recording burn-in test inside the aluminum enclosure to verify thermal dissipation efficiency via the internal graphite sheet.
Document
Miniature Wearable Pov Camera
A compact cylindrical wearable POV action camera powered by a rechargeable lithium battery with local MicroSD card storage.
Design Overview
| Item | Details |
|---|---|
| Product Type | Miniature Wearable Pov Camera |
| Key Functions | Capture POV action video, Local video storage on MicroSD card, Rechargeable lithium battery power management |
| Power Source | Li-Ion Battery |
| Connectivity | Local Storage |
| Size | Lipstick tube / cylindrical shape |
| Environment | wearable |
| Difficulty | Advanced |
| Est. Time | 6-8 hours |
System Architecture
Power Topology: Single-cell Li-Ion battery feeds a high-efficiency buck-boost regulator (TPS63020) combined with a linear charger and power path management, generating a stable 3.3V main rail for the SoC and storage, alongside dedicated low-noise LDO rails for the image sensor.
Module List
| Module ID | Type | Name | Function | Voltage |
|---|---|---|---|---|
| POWER_MANAGEMENT | POWER | TI TPS63020 Buck-Boost Regulator & Linear Charger | Provides regulated system power from single-cell Li-Ion battery across full discharge curve and manages charging. | 3.3V |
| BATTERY | POWER | Custom Cylindrical Li-Ion Battery (400mAh, 3.7V) | Main power source for the wearable POV camera fitting the 18mm lipstick tube form factor. | 3.7V |
| VIDEO_SOC | MCU | Ingenic T40 / Novatek NT98562 Low-Power Video SoC | Handles real-time video processing, ISP, and hardware H.264/H.265 encoding up to 1080p60. | 3.3V |
| IMAGE_SENSOR | SENSOR | Sony IMX335 5MP CMOS Image Sensor | Captures high-definition optical video frames with excellent low-light performance. | 2.8V / 1.8V |
| STORAGE | MODULE | MicroSD Card Socket with UHS-I Interface | Provides user-replaceable high-capacity local storage for video files. | 3.3V |
| USB_INTERFACE | MISC | USB Type-C Connector (USB 2.0 + Power) | Used for battery charging and offloading recorded video data to a host computer. | 5.0V |
| MECHANICAL_THERMAL | ACTUATOR | Aluminum Alloy Enclosure with Internal Thermal Graphite Sheet | Dissipates heat generated by the video SoC and provides splash-resistant mechanical rigidity. | 0V |
Design Schemes
High-Efficiency Low-Power SoC Scheme ★
Utilizes a dedicated low-power video SoC with integrated H.264/H.265 hardware encoder for crisp 1080p60 recording.
Trade-offs: Higher video resolution and smoother framerate at the cost of slightly stricter thermal management inside the 18mm cylindrical enclosure.
Lightweight MCU & Compressed JPEG Scheme
Utilizes a mainstream dual-core MCU with external PSRAM and camera sensor with embedded JPEG engine for an ultra-low-cost build.
Trade-offs: Lower component cost and simpler layout, but limited to lower frame rates or compressed JPEG sequence video rather than full H.264 streaming.
Key IC selection
main video SoC / compute engine
- Need: Real-time 1080p60 video processing, ISP, and H.264/H.265 hardware encoding under strict thermal and power limits
- Class: Low-power high-integration Video RISC-V/ARM SoC with built-in ISP and encoder
- Shortlist: Ingenic T40 series, Novatek NT98562
- Pick: Evaluate based on active power consumption at 1080p60, package footprint matching the 18mm tube, and SDK maturity for thermal throttling control
buck-boost regulator and linear charger
- Need: Maintain a stable system rail from a single-cell Li-Ion battery (2.7V to 4.2V) while supporting USB charging in a tiny footprint
- Class: Synchronous Buck-Boost DC-DC converter with integrated battery charger
- Shortlist: TI TPS63020, Maxim / Analog Devices equivalent low-Iq buck-boost
- Pick: Select based on peak output current capability during SoC burst encoding, quiescent current to maximize standby time, and external component count
high-definition optical sensor
- Need: 5MP high-definition video capture with high sensitivity and low light performance in a compact optical format
- Class: Back-illuminated CMOS Image Sensor with MIPI CSI-2 interface
- Shortlist: Sony IMX335, OmniVision equivalent 5MP sensor
- Pick: Select based on MIPI lane count matching the video SoC, optical stack height, and power consumption profile in active video mode
Risk register
| ID | Area | Severity | Detail | Mitigation |
|---|---|---|---|---|
| r1 | thermal | high | An 18mm lipstick tube form factor enclosing an active video SoC running 1080p60 creates severe heat concentration with minimal surface area for natural convection. | Optimize the internal thermal graphite sheet coupling the SoC directly to the aluminum alloy enclosure; implement aggressive firmware dynamic voltage and frequency scaling (DVFS) and thermal throttling. |
| r2 | power | high | A 400mAh battery provides very limited runtime under heavy video encoding loads, and high peak transient currents during Wi-Fi/video bursts could cause battery voltage sagging below system brownout thresholds. | Select bulk decoupling capacitors with ultra-low ESR near the TPS63020 and video SoC input rails; optimize power sequencing and sleep states in firmware. |
| r3 | mech | med | Splash-resistant mechanical rigidity combined with a user-accessible MicroSD card slot and USB Type-C port in a tiny cylindrical housing creates sealing and assembly challenges. | Use custom internal gasketing, O-rings around end caps, and a push-push MicroSD connector with a sealed external door or waterproof PCB conformal coating. |
Key Components
5/7 modules matched to real parts. See the BOM tab for the full component table.
TI TPS63020 Buck-Boost Regulator & Linear Charger (TPS63020)
Rejected weak/wrong-class catalog hits; using web recommendation: TPS63020
Custom Cylindrical Li-Ion Battery (400mAh, 3.7V) (ICR14250)
Rejected weak/wrong-class catalog hits; using web recommendation: ICR14250
Ingenic T40 / Novatek NT98562 Low-Power Video SoC (T40N)
The candidate matches the primary MPN 'T40N'. Although the manufacturer listed (Lumissil) appears to be a distributor or
Build Summary
- Difficulty: Advanced
- Estimated time: 6-8 hours
- Tools required: Inventory scanner, Anti-static bins, ESD wrist strap, Soldering iron, Hot air rework station, PCB stencil jig
See the Build tab for the full step-by-step assembly guide.
Generated by YuanQi AI Design System · Query: A tiny homemade camera device