Part Number: TCAN1042HGVDRQ1

Manufacturer: Texas Instruments

Description: CAN Interface IC Automotive Fault Protected CAN Transceiver with Flexible Data-Rate 8-SOIC -55 to 125

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Description for the TCAN1042HGV-Q1

This CAN transceiver family complies with the High Speed CAN (Controller Area Network) Physical Layer ISO11898-2 (2016) standard. CAN FD networks with a maximum speed of 2 Mbps are compatible with all devices (megabits per second). Devices with a “G” suffix are intended for data rates up to 5 Mbps. In addition, “V” variations have an additional power supply input that is used to adjust the input pin thresholds and RXD output level. With a remote wake request feature, this series features a low-power standby mode. To increase the robustness of the device and network, all devices also have many security features.

Features for the TCAN1042HGV-Q1

  • AEC-Q100 (grade 1): Automotive applications qualified.
  • Complies with the physical layer requirements of ISO 11898-2:2016 and ISO 11898-5:2007.

Detailed Description

The High Speed CAN (Controller Area Network) physical layer standard, ISO11898-2 (2016), is met by these CAN transceivers. They are made to support CAN FD data rates greater than 1 Mbps and longer and more heavily loaded networks with improved timing margins and larger data rates. To increase device and CAN robustness, these devices offer a variety of protection features.

Feature Description

Timeout for TXD Dominant The TXD DTO circuit prevents network communication from being blocked by the transceiver during normal mode (the only mode in which the CAN driver is active), even if TXD is held dominant for a longer period than the timeout period tTXD DTO due to a hardware or software failure—starting on a falling edge on TXD, the DTO circuit timer.

If no rising edge is detected before the timeout period has passed, the DTO circuit turns off the CAN bus driver. As a result, the bus is now open for use by network nodes for communication. Reactivating the CAN driver clears the TXD DTO state when a recessive signal is detected on the TXD port. The CAN bus terminals are biased to the recessive level during a TXD dominant timeout, while the receiver and RXD terminal continue to represent activity on the CAN bus.

● Thermal Shutdown (TSD)

When the device’s junction temperature reaches the thermal shutdown threshold (TTSD), the device shuts down the CAN driver circuits, obstructing the TXD-to-bus transmission path. The receiver-to-RXD path is still functional even though the CAN bus terminals are biased to the recessive level due to a thermal shutdown. When the junction temperature reaches a temperature that is at least equal to the device’s thermal shutdown hysteresis temperature (TTSD HYS), the shutdown condition is declared cleared.

● Unpowered Device

If the device is not powered, it is intended to be “ideal passive” or “no load” to the CAN bus. When the device is turned off, the bus terminals (CANH, CANL) have extremely low leakage currents to prevent bus overloading. This is crucial if certain network nodes go dark while the remainder is still up and running. To avoid overloading other circuits that might still be powered, the logic terminals also have incredibly low leakage currents when the device is off.

● Floating Terminals

If the terminals float, these devices have internal pull-ups on crucial terminals that will put them into a known state. If the TXD terminal floats, it is dragged up to VCC or VIO to induce a recessive input level. If the STB terminal floats, it is also pulled up to put the device into low-power Standby mode.

● Device Functional Modes

Normal mode and Standby mode are the two primary operating modes for the device. The STB input terminal is used to choose the operating mode.

● CAN Bus States

During powered device operation, the Might bus can be either dominant or recessive. When the TXD and RXD terminals are both logic low, the bus is said to be in a dominating bus condition. The bus is in a recessive bus state when it is biased to VCC / 2 by the receiver’s high-resistance internal input resistors RIN, which corresponds to a logic high on the TXD and RXD terminals.

● Normal Mode

By lowering the STB terminal, you can choose the normal device operation mode. CAN communication is bidirectional, and the CAN driver and receiver are fully functional. The driver translates a digital input on TXD into a differential output on CANH and CANL. The receiver converts the differential signal from CANH and CANL into a digital output on RXD.

● Standby Mode

Turning the STB terminal high can start the low-power Standby mode. As the bus lines are biased to ground in this mode to reduce system supply current, neither the bus transmitter nor the standard mode receiver will accept data. Only the low-power receiver will watch for movement on the bus. RXD denotes a legitimate wake-up event following identifying a wake-up pattern (WUP) on the bus.

Only the VIO pin is used to power the low-power receiver. This enables VCC to be removed, further reducing power usage.

In Standby mode, the bus lines are biased to ground to reduce the current system supply needed. Even if VIO is the transceiver’s only supply voltage source, the low-power receiver, powered by VIO, can detect CAN bus activity.

Power Supply Recommendations

The operating voltage range for these devices’ VCC input supply ranges from 4.5 V to 5.5 V. An output level shifting supply input, or VIO is present in some devices and is suited for a range of 3 V to 5.5 V. Both supply inputs need to be tightly controlled. Near the primary VCC supply output of the CAN transceiver, a bulk capacitance of 4.7 F should be installed. It is recommended to put a bypass capacitance of typically 0.1 F next to the device’s VCC and VIO supply connections. This aids in compensating for the resistance and inductance of the PCB power planes and traces and reducing supply voltage ripple on the outputs of switched-mode power supplies.


To guard against EFT and surge transients that could occur in industrial situations, robust and dependable bus node design frequently necessitates the inclusion of an external transient protection device. High-frequency layout techniques must be used during PCB design since ESD and transients have a broad frequency bandwidth ranging from roughly 3 MHz to 3 GHz.

The family has excellent on-chip IEC ESD protection, although external TVS diodes can be added if higher levels of system-level immunity are necessary. To stop noisy transient events from spreading farther into the PCB and system, TVS diodes and bus filtering capacitors should be positioned as close to the onboard connectors as is practical.

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