Overview
The NCN5150DR2G, produced by onsemi, is a single-chip integrated slave transceiver designed for use in two-wire Meter Bus (M-BUS) slave devices and repeaters. This transceiver complies with the European Standards EN 13757−2 and EN 1434−3, which describe the physical layer requirements for M-BUS. It supports communication speeds up to 38,400 baud in half-duplex mode and includes a 3.3 V LDO regulator for powering the device from the bus or an external power supply.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Junction Temperature (TJ) | −40 | 150 | °C | |
| Storage Temperature (TS) | −55 | 150 | °C | |
| Bus Voltage (VBUS) | −50 | 50 | V | |
| UART Communication Speed | 300 | 38400 | baud | |
| Voltage Regulator Output (VDD) | 3.3 | V | ||
| Thermal Resistance, Junction-to-Air (RθJA) - SOIC-16 | 125 | °C/W | ||
| Thermal Resistance, Junction-to-Air (RθJA) - QFN20 | 42 | °C/W | ||
| Ambient Temperature (TA) | −40 | 85 | °C |
Key Features
- Single-chip M-BUS transceiver supporting half-duplex communication up to 38,400 baud.
- Integrated 3.3 V LDO regulator with extended peak current capability of 15 mA.
- Supports powering the slave device from the bus or from an external power supply.
- Adjustable I/O levels and adjustable constant current sink up to 2 or 6 unit loads depending on the package.
- Low bus voltage operation and extended current budget for external circuits.
- Early power fail warning through the PFb pin.
- Thermal shutdown function to protect the transmitter during high junction temperatures.
- Polarity-independent bus connection.
Applications
The NCN5150DR2G is primarily used in utility meters and other sensor devices that comply with the M-BUS protocol. It is suitable for applications requiring reliable and efficient communication and power management over a two-wire bus. This includes smart metering systems, industrial automation, and other IoT devices that need to communicate over M-BUS.
Q & A
- What is the NCN5150DR2G used for?
The NCN5150DR2G is a single-chip integrated slave transceiver for use in two-wire Meter Bus (M-BUS) slave devices and repeaters.
- What communication speeds does the NCN5150DR2G support?
The NCN5150DR2G supports communication speeds up to 38,400 baud in half-duplex mode.
- How is the device powered?
The device can be powered from the bus or from an external power supply.
- What is the role of the PFb pin?
The PFb pin provides an early power fail warning to the microcontroller, allowing it to save data and shut down gracefully.
- What is the thermal shutdown feature?
The thermal shutdown function disables the transmitter when the junction temperature becomes too high, protecting the device during transmission of a 'space' signal.
- Is the bus connection polarity-independent?
- What are the package options for the NCN5150DR2G?
The device is available in SOIC-16 and QFN20 packages.
- What is the voltage regulator output of the NCN5150DR2G?
The voltage regulator output is 3.3 V.
- What is the minimum storage capacitor value required for the STC pin?
The minimum storage capacitor value required for the STC pin is 10 μF.
- How does the device handle M-BUS communication from master to slave?
The device translates bus voltage modulation from the master to TTL UART communication and vice versa.
