Overview
The TJA1055T, produced by NXP USA Inc., is an enhanced fault-tolerant CAN (Controller Area Network) transceiver. It serves as the interface between the CAN protocol controller and the physical wires of the CAN bus. This device is primarily intended for low-speed applications, up to 125 kBd, in passenger cars. It provides differential transmit and receive capabilities, making it suitable for automotive environments where reliability and fault tolerance are critical.
Key Specifications
| Parameter | Description |
|---|---|
| Package Type | 14-SOIC (Small Outline Integrated Circuit) |
| Operating Voltage | 4.75 V to 5.25 V |
| Data Rate | Up to 125 kBd |
| Bus Pins Protection | Short-circuit safe to battery and ground, thermally protected |
| ElectroMagnetic Emission (EME) | Very low due to built-in slope control function |
| ElectroMagnetic Immunity (EMI) | Very high in normal and low power modes |
| ESD Protection | ±8 kV Human Body Model (HBM), ±6 kV IEC 61000-4-2 for off-board pins |
| Low Power Modes | Low current sleep mode and standby mode with wake-up via bus lines |
| Bus Failure Management | Automatic switching to single-wire mode in case of bus failures |
Key Features
- Supports up to 32 nodes on the CAN bus
- Compatible with unshielded bus wires due to built-in slope control and good matching of CANL and CANH bus outputs
- High ESD robustness with ±8 kV HBM and ±6 kV IEC 61000-4-2 protection for off-board pins
- Low-voltage microcontroller support
- Automatic reset to differential mode if bus failure is removed
- Full wake-up capability during failure modes
- Transmit Data (TxD) dominant time-out function
- Supports single-wire transmission modes with ground offset voltages up to 1.5 V
Applications
The TJA1055T is primarily used in automotive applications, particularly in passenger cars, where it serves as a reliable interface between the CAN protocol controller and the physical CAN bus wires. It is suitable for various automotive systems that require robust and fault-tolerant communication.
Q & A
- What is the primary function of the TJA1055T?
The TJA1055T acts as the interface between the CAN protocol controller and the physical wires of the CAN bus.
- What is the maximum data rate supported by the TJA1055T?
The TJA1055T supports data rates up to 125 kBd.
- What type of package does the TJA1055T come in?
The TJA1055T comes in a 14-SOIC package.
- What is the operating voltage range of the TJA1055T?
The operating voltage range is 4.75 V to 5.25 V.
- How many nodes can be connected to the CAN bus using the TJA1055T?
Up to 32 nodes can be connected to the CAN bus.
- What level of ESD protection does the TJA1055T offer?
The TJA1055T offers ±8 kV Human Body Model (HBM) and ±6 kV IEC 61000-4-2 protection for off-board pins.
- Does the TJA1055T support low power modes?
Yes, it supports low current sleep mode and standby mode with wake-up via bus lines.
- How does the TJA1055T handle bus failures?
The TJA1055T automatically switches to single-wire mode in case of bus failures and resets to differential mode if the failure is removed.
- Is the TJA1055T compatible with unshielded bus wires?
Yes, it is compatible with unshielded bus wires due to its built-in slope control and good matching of CANL and CANH bus outputs.
- What is the significance of the Transmit Data (TxD) dominant time-out function in the TJA1055T?
The Transmit Data (TxD) dominant time-out function helps in managing the transmission protocol and preventing indefinite dominant states on the bus.
