SN65HVD233DR

SN65HVD233DR

Part Number: SN65HVD233DR

Manufacturer: Texas Instruments

Description: CAN Interface IC Standby Mode Loop-back

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SN65HVD233DR Description

The SN65HVD233, SN65HVD234, and SN65HV235 are utilized in applications that employ the ISO 11898-described controller area network (CAN) serial communication physical layer. Each one functions as a CAN transceiver, providing bidirectional communication at signaling rates of up to 1 Mbps between a CAN controller and the differential CAN bus.

Due to their protection against cross-wire faults, overvoltages up to 36 V, thermal shutdown, and common-mode transients up to 100 V, the devices are suitable for use in hostile settings. These devices support a 7 V to >12 V common-mode voltage range. These transceivers connect a CPU’s host CAN controller to the differential CAN bus utilized in manufacturing, building automation, transportation, and cars.

SN65HVD233DR Features

● Single 3.3-V Supply Voltage.

● Protection for Bus Pins Fault Exceeds 36 V.

● The ESD Protection of Bus Pins Exceeds 16 kV HBM.

● Conformant To ISO 11898-2.

● Compliance with GIFT/ICT

● Data Rates are as high as 1 Mbps.

● Extensive –7 V to 12 V Common Mode Voltage Range

● A high input impedance permits 120 nodes.

● LVTTL I/Os are 5-V Tolerant.

● Driver Transition Times That Can Be Modified to Improve Emissions Performance

● Low Current Standby Mode, 200-A, Does Not Disturb the Bus When an Unpowered Node Is Present (Typical)

Feature Description

● Diagnostic Loopback (SN65HVD233)

The diagnostic loopback or internal loopback functionality of the SN65HVD233 is activated by a high-level input on pin 5, LBK. The driver output and the bus pins are biased to the off state in this design. This setting completes the data loop from the transmission to reception by logically rerouting the D data input (transmission data) to the R data output pin.

To simulate the built-in loopback of the CAN transceiver, we link the driven receiver output to the R (receive data) pin. By transmitting and receiving a bit sequence or CAN messages, the host protocol controller can carry out diagnostic activities in this mode without disrupting the CAN bus. If the LBK pin isn’t used, it can end up connected to the ground (GND). When not used, it can be left open but is usually drawn inward (as a low-level input).

● Autobaud Loopback (SN65HVD235)

When pin 5, AB, receives a high-level input, the SN65HVD235 switches to autobaud loopback mode. The driver output is turned off to prevent the transceiver’s bus transmit function from being activated while in autobaud mode. Even now, the bus pins are reverse-biased. It is still possible to monitor bus activity because the receiver to R pin path (or the device’s bus receive function) is not disabled. To further facilitate local node transmission to itself in time with bus traffic without interrupting messages on the bus, autobaud mode includes a logic loopback connection from the D pin to the R pin. Consequently, if the CAN controller generates an error frame at the local node, it is not sent out over the bus but is instead detected locally.

Knowing if the local node’s baud rate is in sync with the rest of the network is useful for making any necessary adjustments (auto baud detection). Autobaud detection works well with programs that use a fixed set of baud rates. One common industrial app, for instance, lets you choose between data rates of 125 kbps, 250 kbps, and 500 kbps. The application program could presume a first baud rate of 125 kbps once the SN65HVD235 is set to autobaud loopback mode. Next, it watches the bus for a message from another node. Because the sample times will be off, the local CAN controller will issue an error message if the incorrect baud rate has been chosen. In this case, however, the local CAN controller of this node generates an error frame, but no other nodes get it because the device’s bus-transmit function has been deactivated.

Next, the program checks the local CAN controller’s status register indicators for the message received and error warning status to see if the baud rate was correctly configured. The error counters in the CAN controller have been increased, as indicated by the alert status. If the message status is “received,” the sender’s message was successfully delivered. The program will switch the CAN controller to the next potentially valid baud rate whenever an error occurs and wait for another message. This procedure is repeated until a whole message is received, at which point the appropriate baud rate has been determined.

At this point, the application would set pin 5 to a low level, putting the SN65HVD235 into a regular transmitting mode and restoring the transceiver’s bus-transmit and bus-receive capabilities to their usual operational modes. The unused AB pin can be connected to the ground (GND). It can be left open if not in use but is normally pulled low internally (as a low-level input).

● Slope Control

Pin 8 (Rs) of the SN65HVD233, SN65HVD234, and SN65HV235 can be used to connect a resistor, which can then be connected to ground (GND) or a low-level input voltage to alter the rise and fall slope of the driver output. The amount of current pulled from a pin’s output is directly correlated with the slope of the driver’s output signal. A 10 k external resistor produces a 15 V/s slew rate, while a 100 k resistor produces 2.0 V/s.

● Standby

If a high-level input with a voltage greater than 0.75 VCC is supplied to the RS input, the circuit will go into sleep mode with a low current and only listen to functionality (pin 8). The driver will be turned off during this period, but the receiver will continue to function normally. Suppose the local controller is utilizing this mode to save power while it waits for bus action. In that case, it can monitor for a falling edge on the R output pin, which indicates that a dominant signal is being driven onto the CAN bus. This can be done while the controller waits for the bus activity. This mode is inaccessible in any other circumstance, as the local controller must use the CAN bus to be usable. When this occurs, the local controller can pull the RS pin low to revert to high-speed or slope control mode.

Conclusion

Each supply should have a ceramic capacitor with a value of 100 nF isolated from it and placed as close as feasible to the VCC supply pins. This will ensure that the device will operate reliably regardless of the data rate or supply voltage. A linear voltage regulator appropriate for the 3.3 V supply can be found in the TPS76333.

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