Overview
The THVD1505DR is a low-power, half-duplex RS-485 transceiver produced by Texas Instruments. This device is designed for robust and reliable data transmission in various industrial and commercial applications. It features automatic bus-polarity correction, high levels of electrostatic discharge (ESD) protection, and a wide operating temperature range. The THVD1505DR operates from a single 5-V power supply and is housed in an 8-pin SOIC package, making it suitable for multi-point applications over long cable runs.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage (VCC) | 4.5 | 5 | 5.5 | V |
| Differential Input Voltage (VID) | -12 | 12 | V | |
| Input Voltage at Any Bus Terminal (VI) | -7 | 12 | V | |
| High-Level Input Voltage (VIH) | 2 VCC | V | ||
| Low-Level Input Voltage (VIL) | 0 | 0.8 | V | |
| Driver Output Current (IO) | -60 | 60 | mA | |
| Receiver Output Current (IO) | -8 | 8 | mA | |
| Differential Load Resistance (RL) | 54 | 60 | Ω | |
| Signaling Rate (1/tUI) | 0.3 | 1000 | kbps | |
| Junction Temperature (TJ) | -40 | 150 | °C | |
| Operating Ambient Temperature (TA) | -40 | 125 | °C |
Key Features
- Automatic bus-polarity correction within 45 ms, detecting and correcting bus mis-wiring.
- High levels of ESD protection: ±16-kV HBM, ±8-kV IEC 61000-4-2 contact and air-gap discharge, and ±2-kV IEC 61000-4-4 fast transient burst.
- Open, short, and idle bus fail-safe operation.
- Large receiver hysteresis for noise rejection: 120 mV.
- Support for up to 256 nodes on a bus (1/8 unit load).
- Low power consumption: standby supply current < 1 µA, operational supply current < 1.1 mA.
- Glitch-free power-up/down for hot plug-in capability.
- Wide common-mode voltage range, suitable for multi-point applications over long cable runs.
- Single 5-V power supply operation.
Applications
- Electricity meters
- HVAC systems
- Inverters
- Video surveillance systems
Q & A
- What is the primary function of the THVD1505DR?
The THVD1505DR is a half-duplex RS-485 transceiver designed for data transmission with automatic bus-polarity correction and high ESD protection.
- What is the operating voltage range of the THVD1505DR?
The device operates from a single 5-V power supply with a voltage range of 4.5 V to 5.5 V.
- What level of ESD protection does the THVD1505DR offer?
The device offers high levels of ESD protection, including ±16-kV HBM, ±8-kV IEC 61000-4-2 contact and air-gap discharge, and ±2-kV IEC 61000-4-4 fast transient burst.
- How many nodes can share a common RS-485 bus using the THVD1505DR?
Up to 256 nodes can share a common RS-485 bus.
- What is the maximum data rate supported by the THVD1505DR?
The device supports data rates up to 1 Mbps.
- What is the operating temperature range of the THVD1505DR?
The device operates over an ambient temperature range of -40°C to 125°C.
- Does the THVD1505DR require external fail-safe biasing resistors?
No, the device does not require external fail-safe biasing resistors due to its internal fail-safe operation.
- What package type is the THVD1505DR available in?
The device is available in an 8-pin SOIC package.
- How does the THVD1505DR handle bus polarity correction?
The device automatically corrects bus polarity within 45 ms, detecting and correcting bus mis-wiring.
- Is the THVD1505DR suitable for hot plug-in applications?
Yes, the device features glitch-free power-up/down for hot plug-in capability.
