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本系列文章主要讲解NXP（恩智浦）—TJA1042TK/3 CAN收发器芯片的相关知识，希望能帮助更多的同学认识和了解NXP（恩智浦）—TTJA1042TK/3 CAN收发器芯片。
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此次架构中TJA1042TK/3作为CAN收发器使用，下面将详细介绍此芯片。
1. 描述
The TJA1042 high-speed CAN transceiver provides an interface between a Controller Area Network (CAN) protocol controller and the physical two-wire CAN bus. The transceiver is designed for high-speed CAN applications in the automotive industry, providing the differential transmit and receive capability to (a microcontroller with) a CAN protocol controller.
The TJA1042 belongs to the third generation of high-speed CAN transceivers from NXP Semiconductors, offering significant improvements over first- and second-generation devices such as the TJA1040. It offers improved ElectroMagnetic Compatibility (EMC) and ElectroStatic Discharge (ESD) performance, and also features:
- Ideal passive behavior to the CAN bus when the supply voltage is off
- A very low-current Standby mode with bus wake-up capability
- TJA1042T/3 and TJA1042TK/3 can be interfaced directly to microcontrollers with supply voltages from 3 V to 5 V
The TJA1042 implements the CAN physical layer as defined in ISO 11898-2:2016 and SAE J2284-1 to SAE J2284-5. This implementation enables reliable communication in the CAN FD fast phase at data rates up to 5 Mbit/s.
These features make the TJA1042 an excellent choice for all types of HS-CAN networks, in nodes that require a low-power mode with wake-up capability via the CAN bus.
2. 特性
- ISO 11898-2:2016 and SAE J2284-1 to SAE J2284-5 compliant
- Timing guaranteed for data rates up to 5 Mbit/s in the CAN FD fast phase
- Suitable for 12 V and 24 V systems
- Low ElectroMagnetic Emission (EME) and high ElectroMagnetic Immunity (EMI)
- VIO input on TJA1042T/3 and TJA1042TK/3 allows for direct interfacing with 3 V to 5 V microcontrollers
- SPLIT voltage output on TJA1042T for stabilizing the recessive bus level
- Available in SO8 package and leadless HVSON8 package (3.0 mm*3.0 mm) with improved Automated Optical Inspection (AOI) capability
- Dark green product (halogen free and Restriction of Hazardous Substances (RoHS) compliant)
- AEC-Q100 qualified
- Very low-current Standby mode with host and bus wake-up capability
- Functional behavior predictable under all supply conditions
- Transceiver disengages from the bus when not powered up (zero load)
- Transmit Data (TXD) dominant time-out function
- Bus-dominant time-out function in Standby mode
- Undervoltage detection on pins VCC and VIO
- High ESD handling capability on the bus pins (±8 kV)
- High voltage robustness on CAN pins (±58 V)
- Bus pins protected against transients in automotive environments
- Thermally protected
3. 框架图
4. 典型电路
5. 引脚定义
| PIN | Symbol | Description |
| 1 | TXD | transmit data input |
| 2 | GND | ground supply |
| 3 | VCC | supply voltage |
| 4 | RXD | receive data output; reads out data from the bus lines |
| 5 | VIO | supply voltage for I/O level adaptor |
| 6 | CANL | LOW-level CAN bus line |
| 7 | CANH | HIGH-level CAN bus line |
| 8 | STB | Standby mode control input |
6. 操作模式
The TJA1042 supports two operating modes, Normal and Standby, which are selected via pin STB.
| Mode | Pin STB | Pin RXD | |
| LOW | HIGH | ||
| Normal | LOW | bus dominant | bus recessive |
| Standby | HIGH | wake-up request detected | no wake-up request detected |
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