The AT7456E is a high-performance On-Screen Display (OSD) chip designed to enhance the capabilities of unmanned aerial vehicles (UAVs). This single-channel monochrome OSD chip integrates a built-in EEPROM, allowing for the seamless overlay of critical telemetry data—such as altitude, speed, battery status, and GPS coordinates—directly onto the pilot's video feed. Its compatibility with both NTSC and PAL video standards ensures global applicability, making it an ideal choice for FPV racing drone enthusiasts and professionals alike. With features like SPI control, comprehensive video interface, and robust sync outputs, the AT7456E not only simplifies integration into existing drone systems but also elevates the piloting experience by providing real-time, customizable information overlays. Its compact design and low power consumption make it particularly suitable for weight-sensitive and battery-powered UAVs, ensuring optimal performance without compromising efficiency.In this blog, ANDESOURCE'll explore the features and applications of the AT7456E OSD chip, highlighting its role in enhancing UAV telemetry for FPV enthusiasts, DIY hobbyists, and professional pilots.
Key Specifications of AT7456E for the Drone Industry
Below is a table summarizing the key specifications of the AT7456E that are most relevant to the UAV industry:
Feature | Details |
Operating Voltage | 3.15V to 5.25V (typical 5V), with typical currents around 51.3mA (I_AVDD: 2.2mA, I_DVDD: 43.1mA, I_PVDD: 6.0mA) |
Display Capacity | 16 rows x 30 columns (PAL), 13 rows x 30 columns (NTSC) |
User-Defined Characters | 512, stored in EEPROM, with a character size of 12 × 18 pixels |
Video Standards | Supports NTSC and PAL, with internal sync generator |
Interface | SPI compatible, allowing full control over character data, display memory, and attributes |
Video Interface | Includes clamp input, sync separator, and outputs like VSYNC, HSYNC, LOS detection |
Package | 28-pin TSSOP with exposed pad for thermal relief |
Operating Temperature Range | -40°C to +85°C |
Additional Features | Row-level brightness control, blink, inverse, and background effects |
Standout Features for the Drone Industry
The AT7456E stands out in the drone industry with its efficient integration of essential features tailored for analog OSD telemetry applications:
Integrated EEPROM for Customizable Displays
The built-in EEPROM allows for storing up to 512 user-defined characters, reducing the need for additional external EEPROM for OSD character storage. This is crucial for drone pilots who require specific telemetry data—such as altitude, speed, battery status, and GPS coordinates—to be displayed on their FPV goggles. The ability to tailor the OSD to individual preferences ensures that pilots can focus on flying without being distracted by unnecessary information.
Global Video Standard Compatibility
Supporting both NTSC and PAL video standards, the AT7456E ensures that drone systems can be used worldwide without compatibility issues. This is particularly important for FPV systems, where video standards vary by region (e.g., NTSC in North America and PAL in Europe). This versatility makes the AT7456E a reliable choice for international drone operators and manufacturers.
SPI Interface for Seamless Integration
The SPI-compatible interface facilitates integration with flight controllers that support SPI-based OSD chips, such as Betaflight and iNav, with potential firmware adjustments. This allows for dynamic control and updates of the OSD display, enabling real-time display of telemetry data provided by the connected flight controller. For drone builders and hobbyists, this ease of integration is a significant advantage, as it simplifies the process of adding advanced OSD capabilities to custom drone designs.
Robust Video Signal Management
The AT7456E features a comprehensive video interface with clamp input, sync separator, and sync outputs (VSYNC, HSYNC), ensuring stable and clear OSD overlays when a reliable video signal is present. These features support consistent telemetry displays critical for FPV drone operations. The chip's Loss of Signal (LOS) detection allows pilots to monitor video link health, enhancing system reliability.
Flexible Display Options to Support Informed Flight Decisions
With the ability to control row-level brightness, blinking, and inversion effects, the AT7456E allows for creating attention-grabbing alerts, such as low battery warnings or navigation cues, directly on the video feed. This helps pilots remain informed during critical moments of flight, such as landing or navigating through complex environments.
Compact and Efficient Design
Housed in a small TSSOP-28 EP package, the AT7456E is designed for space-constrained applications. Its low power consumption further ensures that it does not drain the drone's battery, extending flight times and improving overall efficiency.
Cost-Effective and Advanced Performance
The AT7456E delivers advanced OSD capabilities at an affordable price, making it a compelling choice for both hobbyist and commercial UAV applications. Its integrated 512-byte EEPROM reduces the need for external memory, lowering the bill of materials cost, while its comprehensive video interface (including clamp input, sync separator, and LOS detection) minimizes the need for additional components. The chip’s ability to support 512 user-defined characters and a 16x30 grid (16 rows x 30 columns (PAL), 13 rows x 30 columns (NTSC)) is compatible with the industry-standard MAX7456, offering similar customizable overlays for real-time telemetry data provided by the flight controller, though firmware adjustments may be necessary.This combination of low cost and high performance ensures reliable, advanced OSD functionality for budget-conscious drone designs.
Versatility Across UAV Types
The AT7456E's versatility makes it suitable for a wide range of UAV applications, ensuring that it can meet the diverse needs of the drone industry:
FPV Racing and Freestyle Multirotors
Pilots benefit from real-time data overlays like battery voltage, flight time, and RPM, which are critical for high-performance flying. The AT7456E's customizable OSD ensures that racers can focus on their maneuvers without losing sight of essential telemetry.
DIY and Hobbyist Drones
For those building custom drones, the AT7456E offers an affordable and effective way to add advanced OSD capabilities. Its compatibility with popular flight controllers and ease of integration make it a favorite among hobbyists and DIY enthusiasts.
Fixed-Wing UAVs
For longer-range missions, the AT7456E can display critical navigation data, such as altitude, heading, and distance to waypoint, enhancing the pilot's control over the aircraft. Its robust video signal management ensures clear overlays even during long flights.
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