SN65HVD1050DR-HX

This device is an interface chip connecting CAN protocol controllers to the physical bus, suitable for trucks, buses, automobiles, industrial control, and other applications. It supports a data transfer rate of 1 Mbps and is capable of transmitting differential signals between the bus and the CAN protocol controller, fully compliant with ISO 11898. The driver stage integrates current-limiting protection to prevent circuit damage caused by short circuits to positive or negative power supplies. The TXD pin features a built-in pull-up to VCC, ensuring the bus remains in a recessive state when the TXD pin is unpowered. The S pin features a built-in pull-up path to VCC, ensuring the transceiver remains in standby mode when the S pin is unpowered. In the event of a supply voltage drop, the TXD, S, and RXD pins will enter a disconnected state to prevent reverse current flow through these pins. The device incorporates thermal protection: when the junction temperature exceeds 160°C, the driver stage current is reduced. Since the driver transistors are the primary power-consuming components, reducing current lowers power dissipation, thereby cooling the chip, while the rest of the chip continues to operate normally. A built-in TXD dominant timeout timer circuit prevents the bus lines from being driven to a permanent dominant state (which would block all network communication) in the event that the TXD pin is forced permanently low due to a hardware or software fault. The timer is triggered by a falling edge on the TXD pin. If the low level on the TXD pin persists beyond the internal timer value (tdom), the transmitter is disabled, placing the bus in a recessive state. The timer is reset by a rising edge on the TXD pin. The control pin S allows selection between two operating modes: high-speed mode and standby mode. In high-speed mode (i.e., normal operating mode), with the S pin connected to ground, the transceiver transmits and receives data via the CANH and CANL bus lines. In this mode, the differential receiver converts analog data on the bus to digital data and outputs it to the RXD pin via a multiplexer. If the S pin is left floating or connected to a high level, standby mode is entered. In this mode, the transmitter and receiver are shut down, and the bus lines are monitored by a low-power differential comparator. When a high level is applied to the S pin, the low-power receiver and wake-up filter are activated. Once the low-power differential comparator detects a bus level above the dominant threshold tBUS, the RXD pin goes low.

Applications

• Automotive Electronics
• Safety Systems
• Industrial Control & Automation
• Smart Instrumentation
• Building Automation Systems

Key features

• Operating voltage range: VCC = 5V ±10%
• Fully compliant with ISO 11898
• High-speed operation (up to 1 MBaud)
• Transceiver disconnected from bus in unpowered state (zero load)
• Supports at least 110 nodes
• Ultra-low current standby mode with remote wake-up via bus
• Differential receiver with high common-mode range for enhanced EMI immunity
• Transmit data dominant timeout function
• Bus pins protected against transients in automotive environments
• Thermally robust design