Overview
The THVD8000DDFR from Texas Instruments is an RS-485 transceiver designed for power line communication, incorporating On-Off Keying (OOK) modulation and demodulation. This device enables the transmission of data over existing power lines, significantly reducing system costs by allowing power delivery and data communication to share the same pair of wires. The THVD8000 operates within a supply voltage range of 3-V to 5.5-V and supports half-duplex communication with data rates up to 500 kbps. It is packaged in an 8-pin SOT-23 package, making it suitable for space-constrained applications. The device features a pin-programmable interface and adjustable carrier frequency via an external resistor, providing flexibility in system design.
Key Specifications
| Parameter | Min | Max | Unit | Description |
|---|---|---|---|---|
| VCC Supply Voltage | -0.5 | 7 | V | Supply voltage range |
| VL Input Voltage | -0.3 | 5.7 | V | Input voltage at any logic pin |
| VCM Operational Common Mode Voltage | -7 | 12 | V | Common mode voltage at A and B pins |
| VIH High-Level Input Voltage | 2 VCC | VCC | V | High-level input voltage at D and MODE pins |
| VIL Low-Level Input Voltage | 0 | 0.8 | V | Low-level input voltage at D and MODE pins |
| IO Output Current | -60 | 60 | mA | Driver output current |
| RF_SET Carrier Frequency Selection Resistor | 1.5 | 80 | kΩ | Resistor value for carrier frequency selection |
| TA Operating Ambient Temperature | -40 | 125 | °C | Operating ambient temperature range |
| TSD Thermal Shutdown Temperature | 160 | 185 | °C | Thermal shutdown temperature |
Key Features
- OOK Modulation and Demodulation: Enables data transmission over power lines using On-Off Keying modulation.
- Half-Duplex Communication: Supports data rates up to 500 kbps.
- Adjustable Carrier Frequency: Carrier frequency can be adjusted using an external resistor on the F_SET pin.
- Immunity to Data Polarity: The receiver is immune to A and B polarity, simplifying system installations.
- Integrated ESD and EFT Protection: Protects against electrostatic discharges (ESD) and electrical fast transients (EFT) according to IEC standards.
- Thermal Shutdown Protection: Disables the driver and receiver outputs when the junction temperature exceeds the thermal shutdown threshold.
- Glitch-Free Mode Change: Ensures no glitches at the A, B, and R outputs when transitioning between transmit and receive modes.
- Compact Package: 8-pin SOT-23 package suitable for space-constrained applications.
Applications
- HVAC Systems: Used in heating, ventilation, and air conditioning systems for data communication over power lines.
- Building Automation: Facilitates data transmission in building automation systems.
- Factory Automation & Control: Employed in industrial automation for efficient data communication.
- Appliances: Integrated into various appliances for power line communication.
- Lighting Systems: Used in smart lighting systems to combine power and data transmission.
- Grid Infrastructure: Utilized in grid infrastructure for efficient data communication over power lines.
- Power Delivery Systems: Enables data transmission over power delivery systems, enhancing system efficiency.
Q & A
- What is the primary function of the THVD8000DDFR?
The THVD8000DDFR is an RS-485 transceiver with OOK modulation for power line communication, allowing data transmission over existing power lines.
- What is the supply voltage range for the THVD8000DDFR?
The supply voltage range is 3-V to 5.5-V.
- What is the maximum data rate supported by the THVD8000DDFR?
The device supports data rates up to 500 kbps.
- How is the carrier frequency adjusted in the THVD8000DDFR?
The carrier frequency can be adjusted using an external resistor on the F_SET pin.
- What kind of protection does the THVD8000DDFR offer against electrostatic discharges?
The device offers integrated ESD protection according to IEC 61000-4-2 and EFT protection according to IEC 61000-4-4.
- What is the operating temperature range for the THVD8000DDFR?
The operating ambient temperature range is -40°C to 125°C.
- What is the thermal shutdown protection feature in the THVD8000DDFR?
The device enters thermal shutdown protection mode when the junction temperature exceeds the thermal shutdown threshold, disabling the driver and receiver outputs.
- What types of applications is the THVD8000DDFR suitable for?
The device is suitable for HVAC systems, building automation, factory automation, appliances, lighting systems, grid infrastructure, and power delivery systems.
- How does the THVD8000DDFR handle polarity changes in the receiver input?
The receiver is immune to A and B polarity changes, ensuring that the logic level is determined by the signal magnitude rather than polarity.
- What is the package type of the THVD8000DDFR?
The device is packaged in an 8-pin SOT-23 package.
