SN65HVD1040DR

SN65HVD1040DR

Part Number: SN65HVD1040DR

Manufacturer: Texas Instruments

Description: CAN Interface IC Industrial CAN Trans

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Technical Specifications of SN65HVD1040DR

Datasheet  SN65HVD1040DR datasheet
Category Integrated Circuits (ICs)
Family Interface – Drivers, Receivers, Transceivers
Manufacturer Texas Instruments
Series
Packaging Tape & Reel (TR)
Part Status Active
Type Transceiver
Protocol CAN
Number of Drivers/Receivers 1/1
Duplex Half
Receiver Hysteresis 125mV
Data Rate
Voltage – Supply 4.75 V ~ 5.25 V
Operating Temperature -40°C ~ 125°C
Mounting Type Surface Mount
Package / Case 8-SOIC (0.154″, 3.90mm Width)
Supplier Device Package 8-SOIC

SN65HVD1040DR Description

The SN65HVD1040 satisfies, or beyond, the criteria of ISO 11898, which makes it suitable to be used in applications that make use of a Controller Area Network. A device that can serve as a CAN bus transceiver is the SN65HVD1040. It can perform differential transmit and receive operations for CAN controllers at signalling rates up to 1 Mbps in this capability (1) According to ISO 7637. The device has transient protection from -200 V to 200 V, cross-wire, and 12 kV ESD protection on the bus and split pins. It is intended for usage in exceptionally hostile conditions. The gadget also has protection against ground loss and overvoltage starting at -27 V.

The user can select between the high-speed and low-power modes of operation using the STB input (pin 8). One can choose the high-speed mode of operation by connecting the STB to the ground. The SN65HVD1040 enters a low-power bus-monitor standby mode when the STB pin is triggered by applying a high logic level. Any dominant bit on the bus that is longer than 5 microseconds is delivered to the receiver output whenever the SN65HVD1040 is in the low-power bus-monitor standby mode. The local protocol controller may then resuscitate the device when it is required to transmit data to the bus.

In the case of a hardware or software failure, the SN65HVD1040 features a dominant time-out circuit that prevents the driver from terminating network communication. The occasion that triggers the time-out circuit is a decreasing edge on TXD (pin 1). If no rising edge is detected before the circuit’s time-out constant has been reached, the driver will be disabled. The subsequent rising edge on TXD that follows resets the circuit. The SN65HVD1040’s pin 5 has a SPLIT output that can supply a voltage bias for a split-termination network that uses the VCC/2 common-mode bus. The SN65HVD1040 is designed to operate in a temperature range of -40 to 125 degrees Celsius.

SN65HVD1040DR Features

  • 12 kV ESD Protection; Improved Drop-in Replacement for the TJA1040.
  • Protection from -27 V to 40 V bus fault.
  • Split-pin bus stability is tough.
  • Time-Out Function with Dominance.

Overview

The SN65HVD1040 bus transceiver is up to the challenge of fulfilling or exceeding the requirements of ISO 11898 as a high-speed controller area network bus physical layer device. The device connects the CAN protocol controller to the controller area network’s differential bus lines at data rates of up to one megabit per second.

Feature Description

● Mode Control

The High-Speed Mode If the STB pin is set to its low position, the gadget will operate in its high-speed mode. All is well with the CAN bus driver and receiver, and CAN communication can proceed in both ways. The driver takes a digital signal on TXD and converts it to a differential signal on CANH and CANL. The receiver takes the differential signal on CANH and CANL and turns it into a digital signal that can be seen on RXD.

● Low-Power Mode

The device goes into a low-power bus-monitor standby mode when a high logic level is supplied to the STB pin. Power usage is minimal in this setting. Even when the SN65HVD1040 is in its power-saving bus-monitor sleep mode, any dominant bit on the bus that has been present for more than 5 seconds will be transmitted to the receiver output. The bit will be transmitted since the bus-monitor circuit is active. It is possible that the local protocol controller will reactivate the device to allow it to transfer data to the bus when the time arrives.

● Dominant State Time-Out

The CAN driver is operational when in regular mode, hence during normal mode, In the event of a hardware or software failure, the TXD DTO circuit ensures that the transceiver does not disrupt network traffic by maintaining TXD dominance for too long. This can happen if TXD is held dominant for longer than the time-out period tTXD DTO. When there is a falling edge on the driver input, known as TXD, the DTO circuit is activated.

If the DTO circuit does not detect a rising edge on TXD before the time-out period has run its course, the CAN bus driver will be rendered inoperable. This makes it possible for other nodes on the network to communicate with one another via the CAN bus. When a rising edge is detected on the driver input, TXD, the TXD DTO condition is removed, which enables the CAN driver to be enabled again. During a TXD DTO, the receiver and RXD pin will continue to reflect the CAN bus, even though the bus pins will be biased to a recessive level.

● Thermal Shutdown

When the junction temperature becomes 190 degrees Celsius, the SN65HVD1040’s thermal shutdown kicks in and switches off the driver outputs. This shutdown stops a catastrophic failure from occurring due to bus shorts, but it does not safeguard the circuit from potential harm. The user should try to keep the operation conditions within the specified range and should never go beyond the absolute maximum ratings. Replace the SN65HVD1040 if it experiences many problems or faults that last for an extended period of time that can cause the device to enter thermal shutdown.

● SPLIT

Through the SPLIT output pin, you have access to a reference voltage equal to VCC/2. Because of this, the SPLIT voltage in a split termination network needs to be connected to the common mode point (thus the name of the pin), so that it can assist in stabilizing the output common mode voltage.

Layout Guidelines

Successful printed circuit board designs always start with protection and filtering circuits. High-frequency layout strategies must be used during the PCB design process. Because the frequency of ESD and EFT transients can vary anywhere from 3 MHz to 3 GHz, this is essential.

Regarding EFT and surge transients in the workplace, on-chip IEC electrostatic discharge (ESD) protection is generally insufficient. Due to this, external transient protection devices must be included at the bus connectors to create a strong and dependable bus node.  By placing components close to the connector, we can prevent harmful transient events from propagating further into the PCB and the system. Use the power supply ground (VCC) and ground (ground) planes to minimize inductance.

NOTE: When dealing with high frequencies, currently takes the path of least inductance rather than the path of least resistance.

Conclusion

Each supply should be isolated with a 100- nF ceramic capacitor placed as close as practicable to the VCC supply pins to enable reliable functioning across a wide range of data speeds and supply voltages. The TPS76350 is a linear regulator that can be used with a 5V power source.

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