ZHHXDZ SN65LBC031DR-HX

SN65LBC031DR-HX is an interface IC connecting CAN protocol controllers to the physical bus, primarily designed for high-speed applications in passenger vehicles at speeds up to 1 MBaud. It supports differential transmission to the bus and provides differential reception for CAN controllers. The device is suitable for trucks, buses, automobiles, industrial control, and other applications. With a data rate of 1 Mbps, it is capable of transmitting differential signals between the bus and CAN protocol controllers, fully compliant with ISO 11898. The driver stage integrates current-limiting protection to prevent circuit damage from short circuits to positive and negative supply voltages. The TXD pin features a pull-up to VCC, ensuring the bus remains recessive when the TXD pin is unpowered. The S pin has a direct pull-up to VCC, ensuring the transceiver remains in standby when the S pin is unpowered. When supply voltage drops, the TXD, S, and RXD pins enter an open state to prevent reverse current flow through these pins. The IC incorporates thermal protection: when junction temperature exceeds 160°C, current in the driver stage is reduced. Since the driver transistors are the primary power-dissipating elements, reducing current lowers power consumption, ultimately allowing the IC to cool down. During this process, the rest of the IC continues to operate normally. The 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) when the TXD pin is forced permanently low due to hardware or software application faults. 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, the transmitter is disabled, returning the bus to recessive state. The timer is reset by a rising edge on the TXD pin. Control pin S allows selection between two operating modes: high-speed mode and standby mode. In high-speed mode (normal mode), with the S pin tied 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 through 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 threshold, the RXD pin goes low.

• Supply voltage range: VCC = 5V ± 10%
• Fully compliant with ISO 11898
• High-speed operation (up to 1 MBaud)
• Bus disconnected from transceiver when unpowered (zero load)
• Supports minimum 110 nodes
• Ultra-low current standby mode with remote wake-up capability via bus
• Differential receiver with high common-mode range for EMI immunity
• Transmitted data dominant timeout function
• Bus pins protected against transients in automotive environments
• Thermally stable design
• Driver stage short-circuit protection to supply
• Internal pull-up resistors on TXD and S pins for fail-safe logic
• Overtemperature protection
• Built-in TXD dominant timeout timer
• High-speed mode or low-power standby mode selectable via S pin

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