Overview
The TSS521DR, produced by Texas Instruments, is a single-chip transceiver designed for the Meter-Bus standard (EN1434-3). This device is optimized for half-duplex communication and supports full galvanic isolation with optocouplers, making it suitable for applications requiring reliable and isolated data transmission. The TSS521DR integrates a 3.3-V voltage regulator, a power-fail function, and dynamic level recognition for the receiver, along with programmable current sink for the transmitter. It is particularly useful in smart metering and other energy management systems where robust and reliable communication is crucial.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Bus Voltage (|BUSL2 - BUSL1|) | 10.8 | - | 42 | V |
| Input Voltage (RX, RXI) | -0.3 | - | 5.5 | V |
| Input Voltage (BAT) | -0.3 | - | 5.5 | V |
| Operating Free-Air Temperature | -25 | - | 85 | °C |
| Supply Current (ICC) | 1.23 | 1.33 | - | mA |
| Turn-on Time | - | 3 | - | s |
| Modulation Current (IMC) | 11.5 | 19.5 | - | mA |
| High-Level Output Voltage (TX, TXI) | 0.6 | - | 0.9 | V |
| Low-Level Output Voltage (TX, TXI) | 0 | - | 1.5 | V |
Key Features
- Half-Duplex Communication: Supports up to 9600 Baud for UART protocol.
- Power-Fail Function: Integrated power-fail output to alert the microcontroller of critical voltage drops.
- Dynamic Level Recognition: Receiver has dynamic level recognition to ensure reliable data reception.
- Programmable Current Sink: Transmitter current can be programmed using an external resistor.
- 3.3-V Voltage Regulator: Internal voltage regulator with power reserve for delayed switch-off at bus fault.
- Galvanic Isolation: Supports full galvanic isolation with optocouplers.
- Polarity Independent: Connection to the bus is polarity independent due to the rectifier bridge.
- Slave Power Support: Can be powered from the Meter-Bus or a backup battery.
Applications
The TSS521DR is primarily used in smart metering and energy management systems where reliable and isolated data transmission is essential. It is suitable for:
- Smart Meters
- Energy Management Systems
- Industrial Automation
- Remote Monitoring and Control Systems
Q & A
- What is the primary application of the TSS521DR?
The TSS521DR is primarily used in smart metering and energy management systems.
- What communication protocol does the TSS521DR support?
The TSS521DR supports half-duplex communication up to 9600 Baud for UART protocol.
- How does the TSS521DR handle power failure?
The TSS521DR has an integrated power-fail function that alerts the microcontroller of critical voltage drops.
- What is the role of the 3.3-V voltage regulator in the TSS521DR?
The 3.3-V voltage regulator provides power with a reserve for delayed switch-off at bus fault.
- Can the TSS521DR be powered from multiple sources?
- What is the significance of galvanic isolation in the TSS521DR?
Galvanic isolation ensures that the device can operate safely and reliably in environments requiring electrical isolation.
- How does the TSS521DR handle data transmission from slave to master?
The TSS521DR uses current modulation to transmit information from the slave to the master while keeping the bus voltage constant.
- What is the purpose of the dynamic level recognition in the receiver?
Dynamic level recognition ensures that the receiver can detect voltage modulations independently of the data contents.
- Can the transmitter current be programmed in the TSS521DR?
- What is the operating temperature range of the TSS521DR?
The operating temperature range is from -25°C to 85°C.
