"TI-TCAN4551-Q1.pdf: CAN收发器设计及参数详解"

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TI-TCAN4551-Q1.pdf is a datasheet for a CAN transceiver, outlining its features and capabilities. The device is designed for use in 2-wire CAN bus systems, with options for filtering, transient and ESD protection. It operates at a range of voltages, with integrated voltage regulators and various input and output pins for versatile connectivity. The transceiver also includes an SPI slave and system controller, as well as options for terminating nodes. Its compact design makes it suitable for use in automotive applications, with a focus on low power consumption and efficient communication. The datasheet provides detailed information on the device's pin configuration, electrical characteristics, and recommended operating conditions, making it a valuable resource for engineers and designers working on CAN bus systems. Overall, the TI-TCAN4551-Q1.pdf offers a comprehensive overview of a versatile and reliable CAN transceiver, suitable for a wide range of automotive and industrial applications.

SUP

14V

Internal 5 V Ready

INH

FLTR

Crystal/CLKIN

nINT

STANDBY MODE

Transceiver Ready

nWKRQ

on and ramp time are system dependent and not specified

14V

required for Crystal/CLKIN to work.

This is the stable internal clock.

SUP

± 1V

Power_Up

CLKIN is dependent on external source

and timing will not be specified

CRYSTAL

MODE_SLP_STBY_VCCFLTR_ON

1.67 V to

4.14 V

~ 5.5 V

SUP

TCAN4551-Q1

ZHCSK43A –AUGUST 2019–REVISED NOVEMBER 2019

www.ti.com.cn

Parameter Measurement Information (接接下下页页)

图图 14. Power Up Timing

TCAN4551-Q1

ZHCSK43A –AUGUST 2019–REVISED NOVEMBER 2019

www.ti.com.cn

8 Detailed Description

8.1 Overview

The TCAN4551-Q1 is a CAN FD controller with an integrated CAN FD transceiver supporting data rates up to 8

Mbps. The CAN FD controller meets the specifications of the ISO 11898-1:2015 high speed Controller Area

Network (CAN) data link layer and meets the physical layer requirements of the ISO 11898-2:2016 High Speed

Controller Area Network (CAN) specification providing an interface between the CAN bus and the CAN protocol

controller supporting both classical CAN and CAN FD up to 5 megabits per second (Mbps). The TCAN4551-Q1

provides CAN FD transceiver functionality: differential transmit capability to the bus and differential receive

capability from the bus. The device includes many protection features providing device and CAN bus robustness.

The device can also wake up via remote wake up using CAN bus implementing the ISO 11898-2:2016 Wake Up

Pattern (WUP). Input/Output support for 1.8 V, 3.3 V and 5 V microprocessors using V

pin for seamless

interface. The TCAN4551-Q1 has a Serial Peripheral Interface (SPI) that connects to a local microprocessor for

the device's configuration; transmission and reception of CAN frames. The SPI interface supports clock rates up

to 18 MHz.

The CAN bus has two logical states during operation: recessive and dominant. See 图 2 and 图 3.

In the recessive bus state, the bus is biased to a common mode of 2.5 V via the high resistance internal input

resistors of the receiver of each node. Recessive is equivalent to logic high. The recessive state is also the idle

state.

In the dominant bus state, the bus is driven differentially by one or more drivers. Current flows through the

termination resistors and generates a differential voltage on the bus. Dominant is equivalent to logic low. A

dominant state overwrites the recessive state.

During arbitration, multiple CAN nodes may transmit a dominant bit at the same time. In this case, the differential

voltage of the bus is greater than the differential voltage of a single driver.

Transceivers with low power Standby Mode have a third bus state where the bus terminals are weakly biased to

ground via the high resistance internal resistors of the receiver. See 图 2 and 图 3. The TCAN4551-Q1 supports

auto biasing, see CAN Bus Biasing

The TCAN4551-Q1 has the ability to configure many of the pins for multiple purposes and are described in more

detail in Feature Description section. Much of the parametric data is based on internal links like the

TXD/RXD_INT which represent the TXD and RXD of a standalone CAN transceiver. The TCAN4551-Q1 has a

test mode that maps these signals to an external pin in order to perform compliance testing on the transceiver

(TXD/RXD_INT_PHY) and CAN core (TXD/RXD_INT_CAN) independently.

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