{"id":5998,"date":"2024-08-23T15:01:01","date_gmt":"2024-08-23T07:01:01","guid":{"rendered":""},"modified":"2024-08-23T15:01:01","modified_gmt":"2024-08-23T07:01:01","slug":"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528","status":"publish","type":"post","link":"https:\/\/mushiming.com\/5998.html","title":{"rendered":"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528"},"content":{"rendered":"

1\u3001General description<\/p>\n

    \u6982\u8ff0 <\/p>\n

     The TJA1044 is part of the Mantis family of high-speed CAN transceivers. It 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.<\/p>\n

    <\/p>\n

   TJA1044\u662fMantis\u7cfb\u5217\u9ad8\u901fCAN\u6536\u53d1\u5668\u7684\u4e00\u4e2a\u6210\u5458\u3002\u5b83\u63d0\u4f9b\u4e86\u4e00\u4e2a\u63a7\u5236\u5668\u5c40\u57df\u7f51\uff08CAN\uff09\u534f\u8bae\u63a7\u5236\u5668\u548c\u7269\u7406CAN\u603b\u7ebf\u53cc\u7ebf\u3010CAN-H,CAN-L\u3011\u4e4b\u95f4\u7684\u63a5\u53e3\u3002\u8be5\u6536\u53d1\u673a\u662f\u4e3a\u6c7d\u8f66\u884c\u4e1a\u4e2d\u7684\u9ad8\u901fCAN\u5e94\u7528\u800c\u8bbe\u8ba1\u7684\uff0c\u4e3a\u5e26\u6709CAN\u534f\u8bae\u63a7\u5236\u5668\u7684\u5fae\u63a7\u5236\u5668\u63d0\u4f9b\u5dee\u5206\u53d1\u9001\u548c\u63a5\u6536\u80fd\u529b\u3002<\/p>\n

        The TJA1044 offers a feature set optimized for 12 V automotive applications, with
significant improvements over NXP's first- and second-generation CAN transceivers, such
as the TJA1040 and TJA1042, and excellent ElectroMagnetic Compatibility (EMC)
performance.<\/p>\n<\/p>\n

        TJA1044\u63d0\u4f9b\u4e86\u9488\u5bf912 V\u6c7d\u8f66\u5e94\u7528\u4f18\u5316\u540e\u7684\u529f\u80fd\u96c6\uff0c\u4e0eNXP\u7684\u7b2c\u4e00\u4ee3\u548c\u7b2c\u4e8c\u4ee3CAN\u6536\u53d1\u5668\u76f8\u6bd4\u6709\u4e86\u91cd\u5927\u6539\u8fdb\uff0c\u4f8b\u5982TJA1040\u548cTJA1042\uff0c\u5e76\u4e14\u5177\u6709\u826f\u597d\u7684\u7535\u78c1\u517c\u5bb9\u6027\uff08EMC\uff09\u6027\u80fd\u3002<\/p>\n<\/p>\n

Additionally, the TJA1044 features:
\u2022 Ideal passive behavior to the CAN bus when the supply voltage is off
\u2022 A very low-current Standby mode with bus wake-up capability
\u2022 Excellent EMC performance at speeds up to 500 kbit\/s, even without a common mode
choke
\u2022 TJA1044GT\/3 and TJA1044GTK\/3 can be interfaced directly to microcontrollers with
supply voltages from 3 V to 5 V<\/p>\n

\u6b64\u5916\uff0cTJA1044\u8fd8\u5177\u6709\u4ee5\u4e0b\u7279\u70b9\uff1a<\/p>\n

\u2022\u7535\u6e90\u7535\u538b\u5173\u95ed\u65f6\uff0cCAN\u603b\u7ebf\u62e5\u6709\u7406\u60f3\u7684\u88ab\u52a8\u884c\u4e3a<\/p>\n

\u2022\u5177\u6709\u603b\u7ebf\u5524\u9192\u529f\u80fd\u7684\u6781\u4f4e\u7535\u6d41\u5f85\u673a\u6a21\u5f0f<\/p>\n

\u2022\u5373\u4f7f\u6ca1\u6709\u5171\u6a21\uff0c\u4e5f\u80fd\u5728\u9ad8\u8fbe500 kbit\/s\u7684\u4f20\u8f93\u901f\u5ea6\u65f6\u62e5\u6709\u4f18\u5f02\u7684EMC\u6027\u80fd<\/p>\n

\u2022TJA1044GT\/3\u548cTJA1044GTK\/3\u53ef\u4ee5\u76f4\u63a5\u8fde\u63a5\u5230\u7535\u6e90\u7535\u538b\u4ece3\u4f0f\u52305\u4f0f\u7684\u5fae\u63a7\u5236\u5668<\/p>\n

        These features make the TJA1044 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.
The TJA1044 implements the CAN physical layer as defined in ISO 11898-2:2016 and
SAE J2284-1 to SAE J2284-5. The TJA1044T is specified for data rates up to 1 Mbit\/s.
Additional timing parameters defining loop delay symmetry are specified for the other
variants. This implementation enables reliable communication in the CAN FD fast phase
at data rates up to 5 Mbit\/s.      <\/p>\n

        \u8fd9\u4e9b\u7279\u6027\u4f7f\u5f97TJA1044\u6210\u4e3a\u6240\u6709HS-CAN\u7f51\u7edc\u7c7b\u578b\u7684\u6700\u4f73\u9009\u62e9\uff0c\u8fd9\u4e9bHS-CAN\u7f51\u7edc\u662f\u9700\u8981\u901a\u8fc7CAN\u603b\u7ebf\u5177\u6709\u5524\u9192\u529f\u80fd\u7684\u4f4e\u529f\u8017\u6a21\u5f0f\u7684\u7f51\u7edc\u8282\u70b9\u3002TJA1044\u5b9e\u73b0\u4e86ISO 11898-2:2016\u548c<\/p>\n

SAE J2284-1\u81f3SAE J2284-5\u5b9a\u4e49\u7684CAN\u7269\u7406\u5c42\u534f\u8bae\u3002TJA1044T\u53ef\u4ee5\u5c06\u6570\u636e\u901f\u7387\u63d0\u9ad8\u5230\u9ad8\u8fbe1 Mbit\/s\u3002TJA1044T\u7684\u53e6\u4e00\u4e2a\u53d8\u79cd\u53ef\u4ee5\u5b9a\u4e49\u73af\u8def\u5ef6\u8fdf\u5bf9\u79f0\u6027\u7684\u9644\u52a0\u5b9a\u65f6\u53c2\u6570\u3002\u8fd9\u79cd\u53d8\u79cd\u5b9e\u73b0\u53ef\u4ee5\u5728CAN FD\u5feb\u901f\u9636\u6bb5\u5b9e\u73b0\u53ef\u9760\u901a\u4fe1\uff0cCANFD\u7684\u4f20\u8f93\u6570\u636e\u901f\u7387\u53ef\u4ee5\u9ad8\u8fbe5 Mbit\/s\u3002<\/p>\n<\/p>\n

2. Features and benefits<\/p>\n

    \u7279\u70b9\u548c\u4f18\u70b9
2.1 General<\/p>\n

      \u6982\u8ff0<\/p>\n

1)Fully ISO 11898-2:2016 and SAE J2284-1 to SAE J2284-5 compliant
2) Very low-current Standby mode with host and bus wake-up capability
3) Optimized for use in 12 V automotive systems
4) EMC performance satisfies 'Hardware Requirements for LIN, CAN and FlexRay
Interfaces in Automotive Applications\u2019, Version 1.3, May 2012.
5) AEC-Q100 qualified
6) Dark green product (halogen free and Restriction of Hazardous Substances (RoHS)
compliant)<\/p>\n

7\uff09VIO input on TJA1044x\/3 variants allows for direct interfacing with 3 V to 5 V
microcontrollers. Variants without a VIO pin can interface with 3.3 V and 5 V-supplied
microcontrollers, provided the microcontroller I\/Os are 5 V tolerant.
8\uff09 Both VIO and non-VIO variants are available in SO8 and leadless HVSON8 (3.0
mm *3.0 mm) packages; HVSON8 with improved Automated Optical Inspection (AOI)
capability.
 <\/p>\n<\/p>\n

1)\u5b8c\u5168\u7b26\u5408ISO 11898-2:2016\u548cSAE J2284-1\u81f3SAE J2284-5\u6807\u51c6<\/p>\n

2) \u5177\u6709\u4e3b\u673a\u548c\u603b\u7ebf\u5524\u9192\u529f\u80fd\u7684\u6781\u4f4e\u7535\u6d41\u5f85\u673a\u6a21\u5f0f<\/p>\n

3)\u7528\u4e8e12\u4f0f\u6c7d\u8f66\u7cfb\u7edf\u65f6\u8fdb\u884c\u4e86\u4f18\u5316<\/p>\n

4\uff09 EMC\u6027\u80fd\u6ee1\u8db3\u5ba2\u6237\u5bf9\u300a\u6c7d\u8f66\u5e94\u7528\u4e2d\u7684LIN\u3001CAN\u548cFlexRay\u7684\u786c\u4ef6\u63a5\u53e3\u8981\u6c42\u300b\uff0c1.3\u7248\uff0c2012\u5e745\u6708\u3002<\/p>\n

5\uff09 AEC-Q100\u5408\u683c<\/p>\n

6\uff09\u6df1\u7eff\u8272\u4ea7\u54c1\uff08\u65e0\u5364\u7d20\u4e14\u7b26\u5408\u6709\u5bb3\u7269\u8d28(RoHS)\u9650\u5236\uff09<\/p>\n

7\uff09 TJA1044x\/3\u53d8\u79cd\u578b\u53f7\u4e0a\u7684VIO\u8f93\u5165\u5f15\u811a\u5141\u8bb8\u4e0e\u4f9b\u7535\u7535\u538b\u4e3a3 V\u81f35 V\u7684\u5fae\u63a7\u5236\u5668\u76f4\u63a5\u8fde\u63a5\u3002\u6ca1\u6709VIO\u5f15\u811a\u7684\u53d8\u79cd\u578b\u53f7\u53ef\u4ee5\u4e0e\u4f9b\u7535\u7535\u538b\u4e3a3.3 V\u548c5 V\u7684\u5fae\u63a7\u5236\u5668\u76f4\u63a5\u8fde\u63a5\uff0c\u524d\u63d0\u662f\u5fae\u63a7\u5236\u5668I\/O\u53ef\u4ee5\u627f\u53d75V\u3002<\/p>\n

8\uff09 \u6709VIO\u5f15\u811a\u7684\u82af\u7247\u548c\u6ca1\u6709VIO\u5f15\u811a\u7684\u53d8\u79cd\u82af\u7247\u5747\u63d0\u4f9bSO8\u548c\u65e0\u94c5HVSON8\uff083.0\u6beb\u7c73*3.0\u6beb\u7c73\uff09\u5c01\u88c5\uff1bHVSON8\u5c01\u88c5\u5177\u6709\u6539\u8fdb\u7684\u81ea\u52a8\u5149\u5b66\u68c0\u6d4b\uff08AOI)\u7279\u6027\u3002<\/p>\n<\/p>\n

2.2 Predictable and fail-safe behavior<\/p>\n

    \u53ef\u9884\u6d4b\u7684\u6545\u969c\u5b89\u5168\u884c\u4e3a<\/p>\n

1\uff09Functional behavior predictable under all supply conditions
2\uff09Transceiver disengages from bus when not powered (zero load)
3\uff09Transmit Data (TXD) and bus dominant time-out functions
4\uff09 Internal biasing of TXD and STB input pins<\/p>\n

1\uff09\u529f\u80fd\u884c\u4e3a\u5728\u6240\u6709\u4f9b\u7535\u6761\u4ef6\u4e0b\u90fd\u662f\u53ef\u9884\u6d4b\u7684<\/p>\n

2\uff09\u672a\u901a\u7535\uff08\u96f6\u8d1f\u8f7d\uff09\u65f6\uff0c\u6536\u53d1\u5668\u4e0e\u603b\u7ebf\u65ad\u5f00<\/p>\n

3\uff09\u4f20\u8f93\u6570\u636e\uff08TXD\uff09\u548c\u603b\u7ebf\u663e\u6027\u8d85\u65f6\u529f\u80fd<\/p>\n

4\uff09TXD\u548cSTB\u8f93\u5165\u5f15\u811a\u7684\u5185\u90e8\u7535\u538b\u504f\u7f6e<\/p>\n<\/p>\n

2.3 Protection<\/p>\n

     \u4fdd\u62a4<\/p>\n

1\uff09High ESD handling capability on the bus pins (8 kV IEC and HBM)
2\uff09 Bus pins protected against transients in automotive environments
3\uff09 Undervoltage detection on pins VCC and VIO
4\uff09 Thermally protected<\/p>\n

1\uff09\u603b\u7ebf\u5f15\u811a\u4e0a\u7684\u9ad8ESD\u5904\u7406\u80fd\u529b\uff088 kV IEC\u548cHBM\uff09<\/p>\n

2\uff09\u5728\u6c7d\u8f66\u73af\u5883\u4e2d\u9632\u6b62\u77ac\u53d8\u7684\u603b\u7ebf\u5f15\u811a<\/p>\n

3\uff09 \u5f15\u811aVCC\u548cVIO\u4e0a\u7684\u6b20\u538b\u68c0\u6d4b<\/p>\n

4\uff09\u70ed\u4fdd\u62a4<\/p>\n

2.4 TJA1044 CAN FD (applicable to all product variants except TJA1044T)<\/p>\n

     TJA1044 CAN FD\uff08\u9002\u7528\u4e8e\u9664TJA1044T\u4ee5\u5916\u7684\u6240\u6709\u4ea7\u54c1\u578b\u53f7\uff09<\/p>\n

1\uff09Timing guaranteed for CAN FD data rates up to 5 Mbit\/s
2\uff09 Improved TXD to RXD propagation delay of 210 ns<\/p>\n

1\uff09CAN FD\u6570\u636e\u901f\u7387\u9ad8\u8fbe5 Mbit\/s\u65f6\u4f9d\u7136\u53ef\u4ee5\u4fdd\u8bc1\u5b9a\u65f6\u6b63\u5e38\u5de5\u4f5c<\/p>\n

2\uff09 \u5c06TXD\u5230RXD\u7684\u4f20\u64ad\u5ef6\u8fdf\u63d0\u9ad8210 ns<\/p>\n

5. Block diagram<\/p>\n

    \u65b9\u6846\u56fe<\/p>\n

\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528<\/p>\n

6. Pinning information<\/p>\n

   \u5f15\u811a\u4fe1\u606f<\/p>\n

\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528<\/p>\n

\u5f15\u811a\u63cf\u8ff0\uff1a<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
\u7b26\u53f7<\/td>\n\u5f15\u811a<\/td>\n\u63cf\u8ff0<\/td>\n<\/tr>\n
TXD<\/td>\n1<\/td>\n\u4f20\u8f93\u6570\u636e\u8f93\u5165\uff0c\u4eceMCU\u8f93\u5165\u7ed9CAN\u603b\u7ebf<\/td>\n<\/tr>\n
GND\u30101\u3011<\/td>\n2<\/td>\n\u5730\u5f15\u811a<\/td>\n<\/tr>\n
VCC<\/td>\n3<\/td>\n\u4f9b\u7535\u5f15\u811a<\/td>\n<\/tr>\n
RXD<\/td>\n4<\/td>\n\u4f20\u8f93\u6570\u636e\u8f93\u51fa\uff0c\u4eceCAN\u603b\u7ebf\u8f93\u51fa\u7ed9MCU<\/td>\n<\/tr>\n
n.c.<\/td>\n5<\/td>\nTJA1044T, TJA1044GT and TJA1044GTK \u578b\u53f7\u8be5\u5f15\u811a\u672a\u8fde\u63a5<\/td>\n<\/tr>\n
VIO<\/td>\n5<\/td>\nTJA1044GT\/3\u3001TJA1044GTK\/3\u578b\u53f7\u8be5\u5f15\u811a\u624d\u4f1a\u8fde\u63a5\uff0c\u4e3aIO\u53e3\u63d0\u4f9b\u7535\u538b<\/td>\n<\/tr>\n
CANL<\/td>\n6<\/td>\n\u4f4e\u7535\u5e73CAN\u603b\u7ebf<\/td>\n<\/tr>\n
CANH<\/td>\n7<\/td>\n\u9ad8\u7535\u5e73CAN\u603b\u7ebf<\/td>\n<\/tr>\n
STB<\/td>\n8<\/td>\n\u5f85\u673a\u6a21\u5f0f\uff08Standby\uff09\u63a7\u5236\u8f93\u5165<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 \u30101\u3011HVSON8\u5c01\u88c5\u82af\u7247\u5730\u7ebf\u65e2\u8981\u8fde\u63a5\u5230GND\u5f15\u811a\u4e5f\u8981\u8fde\u63a5\u5230\u5916\u9732\u7684\u4e2d\u5fc3\u710a\u76d8\u3002\u8fd9\u4e2a<\/p>\n

GND\u5f15\u811a\u5fc5\u987b\u710a\u63a5\u5230\u7535\u8def\u677f\u7684\u5730\u4e0a\u3002\u4e3a\u4e86\u589e\u5f3a\u70ed\u6027\u80fd\u548c\u7535\u6c14\u6027\u80fd\uff0c\u5efa\u8bae\u5c06\u5916\u9732\u7684\u4e2d\u5fc3\u710a\u76d8\u4e5f\u710a\u63a5\u5230\u7535\u8def\u677f\u5730\u4e0a\u3002<\/p>\n

7. Functional description<\/p>\n

  \u529f\u80fd\u63cf\u8ff0<\/p>\n

7.1 Operating modes<\/p>\n

 \u64cd\u4f5c\u6a21\u5f0f<\/p>\n

The TJA1044 supports two operating modes, Normal and Standby. The operating mode is
selected via pin STB. See Table 4 for a description of the operating modes under normal
supply conditions.<\/p>\n

TJA1044\u652f\u6301\u4e24\u79cd\u5de5\u4f5c\u6a21\u5f0f\uff1a\u6b63\u5e38\u6a21\u5f0f\u548c\u5f85\u673a\u6a21\u5f0f\u3002\u64cd\u4f5c\u6a21\u5f0f\u9700\u8981\u901a\u8fc7STB\u5f15\u811a\u6765\u9009\u62e9\u3002\u6b63\u5e38\u60c5\u51b5\u4e0b\u7684\u64cd\u4f5c\u6a21\u5f0f\u8bf4\u660e\u89c1\u88684\u3002<\/p>\n

\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528<\/p>\n

 \u8868\u683c4\uff1a\u64cd\u4f5c\u6a21\u5f0f<\/p>\n\n\n\n\n\n\n\n\n\n
\u6a21\u5f0f<\/td>\n\u8f93\u5165<\/td>\n\u8f93\u51fa<\/td>\n<\/tr>\n
STB\u5f15\u811a<\/td>\nTXD\u5f15\u811a<\/td>\nCAN\u9a71\u52a8\u5668<\/td>\nRXD\u5f15\u811a<\/td>\n<\/tr>\n
\u6b63\u5e38\u6a21\u5f0f<\/td>\n\u4f4e\u7535\u5e73<\/td>\n\u4f4e\u7535\u5e73<\/td>\n\u663e\u6027<\/td>\n\u4f4e\u7535\u5e73<\/td>\n<\/tr>\n
\u9ad8\u7535\u5e73<\/td>\n\u9690\u6027<\/td>\nCAN\u603b\u7ebf\u663e\u6027\u65f6\u4e3a\u4f4e\u7535\u5e73<\/td>\n<\/tr>\n
CAN\u603b\u7ebf\u9690\u6027\u65f6\u4e3a\u9ad8\u7535\u5e73<\/td>\n<\/tr>\n
\u5f85\u673a\u6a21\u5f0f<\/td>\n\u9ad8\u7535\u5e73<\/td>\nX\u3010\u5ffd\u7565\u3011<\/td>\n\u5bf9\u5730\u504f\u7f6e<\/td>\n\u5f53\u68c0\u6d4b\u5230\u5524\u9192\u65f6\u8ddf\u968fCAN\u603b\u7ebf<\/td>\n<\/tr>\n
\u6ca1\u6709\u5524\u9192\u65f6\u4e3a\u9ad8\u7535\u5e73<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

7.1.1 Normal mode<\/p>\n

        \u6b63\u5e38\u6a21\u5f0f<\/p>\n

A LOW level on pin STB selects Normal mode. In this mode, the transceiver can transmit
and receive data via the bus lines CANH and CANL (see Figure 1 for the block diagram).
The differential receiver converts the analog data on the bus lines into digital data which is
output on pin RXD. The slopes of the output signals on the bus lines are controlled
internally and are optimized in a way that guarantees the lowest possible EME.<\/p>\n

\u5f15\u811aSTB\u4e3a\u4f4e\u7535\u5e73\u65f6\u5de5\u4f5c\u6a21\u5f0f\u9009\u62e9\u4e3a\u6b63\u5e38\u6a21\u5f0f\u3002\u5728\u8fd9\u79cd\u6a21\u5f0f\u4e0b\uff0c\u6536\u53d1\u5668\u53ef\u4ee5\u901a\u8fc7\u603b\u7ebfCANH\u548cCANL\u53d1\u9001\u548c\u63a5\u6536\u6570\u636e\u3002\u5dee\u5206\u63a5\u6536\u5668\u5c06CAN\u603b\u7ebf\u4e0a\u7684\u6a21\u62df\u6570\u636e\u8f6c\u6362\u4e3a\u6570\u5b57\u6570\u636e\uff0c\u7136\u540e\u901a\u8fc7\u5f15\u811aRXD\u8f93\u51fa\u7ed9MCU\u3002CAN\u603b\u7ebf\u4e0a\u8f93\u51fa\u4fe1\u53f7\u7684\u659c\u7387\u53d7\u5230\u5185\u90e8\u63a7\u5236\uff0c\u5e76\u4e14\u4e3a\u4e86\u786e\u4fdd\u6700\u4f4e\u7684EME\u8fdb\u884c\u4e86\u4f18\u5316\u3002<\/p>\n

7.1.2 Standby mode<\/p>\n

\u5f85\u673a\u6a21\u5f0f<\/p>\n

        A HIGH level on pin STB selects Standby mode. In Standby mode, the transceiver is not able to transmit or correctly receive data via the bus lines. The transmitter and Normal-mode receiver blocks are switched off to reduce supply current, and only a low-power differential receiver monitors the bus lines for activity.
        In Standby mode, the bus lines are biased to ground to minimize system supply current.
The low-power receiver is supplied from VIO (VCC in non-VIO variants) and can detect CAN
bus activity even if VIO is the only available supply voltage. Pin RXD follows the bus after
a wake-up request has been detected. A transition to Normal mode is triggered when STB
is forced LOW.<\/p>\n

    <\/p>\n

        \u5f15\u811aSTB\u4e3a\u9ad8\u7535\u5e73\u65f6\u8fdb\u5165\u5f85\u673a\u6a21\u5f0f\u3002\u5728\u5f85\u673a\u6a21\u5f0f\u4e0b\uff0c\u6536\u53d1\u5668\u4e0d\u80fd\u901a\u8fc7\u603b\u7ebf\u4f20\u8f93\u6570\u636e\u6216\u6b63\u786e\u63a5\u6536\u6570\u636e\u3002\u53d1\u5c04\u673a\u548c\u6b63\u5e38\u6a21\u5f0f\u63a5\u6536\u5668\u6a21\u5757\u88ab\u5173\u95ed\u4ee5\u51cf\u5c11\u4f9b\u7535\u7535\u6d41\uff0c\u5e76\u4e14\u53ea\u6709\u4f4e\u529f\u7387\u5dee\u5206\u63a5\u6536\u5668\u8fd8\u5728\u6d3b\u52a8\uff0c\u7528\u4e8e\u76d1\u63a7CAN\u603b\u7ebf\u3002<\/p>\n

        \u5728\u5f85\u673a\u6a21\u5f0f\u4e0b\uff0cCAN\u603b\u7ebf\u504f\u7f6e\u63a5\u5730\uff0c\u4f7f\u5f97\u7cfb\u7edf\u7535\u6e90\u7535\u6d41\u6700\u5c0f\u5316\u3002\u4f4e\u529f\u8017\u63a5\u6536\u5668\u7531VIO\uff08\u6ca1\u6709VIO\u5f15\u811a\u7684\u53d8\u79cd\u82af\u7247\u4e2d\u7684VCC\uff09\u63d0\u4f9b\uff0c\u53ef\u4ee5\u68c0\u6d4bcan\u603b\u7ebf\u6d3b\u52a8\uff0c\u5373\u4f7fVIO\u662f\u552f\u4e00\u53ef\u7528\u7684\u7535\u6e90\u7535\u538b\u3002\u5df2\u68c0\u6d4b\u5230\u5524\u9192\u8bf7\u6c42\u65f6\u5f15\u811aRXD\u7684\u7535\u5e73\u8ddf\u968f\u603b\u7ebf\u7535\u5e73\u3002STB\u5f15\u811a\u88ab\u5f3a\u5236\u4e3a\u4f4e\u7535\u5e73\uff0c\u4f1a\u89e6\u53d1\u5230\u6b63\u5e38\u6a21\u5f0f\u7684\u8f6c\u6362\u3002<\/p>\n

7.2 Remote wake-up (via the CAN bus)<\/p>\n

     \u8fdc\u7a0b\u5524\u9192\uff08\u901a\u8fc7CAN\u603b\u7ebf\uff09<\/p>\n

        The TJA1044 wakes up from Standby mode when a dedicated wake-up pattern (specified
in ISO 11898-2:2016) is detected on the bus. This filtering helps avoid spurious wake-up
events. A spurious wake-up sequence could be triggered by, for example, a dominant
clamped bus or by dominant phases due to noise or spikes on the bus.<\/p>\n

        \u5f53\u4f7f\u7528\u4e13\u7528\u5524\u9192\u6a21\u5f0f\uff08\u5728ISO 11898-2:2016\u4e2d\u6307\u5b9a\uff09\u5728\u603b\u7ebf\u4e0a\u68c0\u6d4b\u5230\u65f6\uff0cTJA1044\u4ece\u5f85\u673a\u6a21\u5f0f\u5524\u9192\u3002\u8fd9\u79cd\u8fc7\u6ee4\u6709\u52a9\u4e8e\u907f\u514d\u865a\u5047\u7684\u5524\u9192\u4e8b\u4ef6\u3002\u4e00\u4e2a\u865a\u5047\u7684\u5524\u9192\u5e8f\u5217\u53ef\u80fd\u662f\u7531\u4e00\u4e2a\u663e\u6027\u94b3\u5236\u7535\u538b\u6216\u8005\u4e00\u4e2a\u7531\u4e8eCAN\u603b\u7ebf\u4e0a\u7684\u566a\u58f0\u6216\u5c16\u5cf0\u9020\u6210\u7684\u663e\u6027\u76f8\u4f4d\u89e6\u53d1\u7684\u3002<\/p>\n

The wake-up pattern consists of:
\u2022 a dominant phase of at least \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 followed by
\u2022 a recessive phase of at least \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 followed by
\u2022 a dominant phase of at least \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528<\/p>\n

\u5524\u9192\u6a21\u5f0f\u5305\u62ec\uff1a<\/p>\n

\u2022 \u4e00\u4e2a\u663e\u6027\u76f8\u4f4d\uff0c\u65f6\u957f\u81f3\u5c11\u4e3a \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 \uff0c\u63a5\u7740\u662f\uff1a
\u2022 \u4e00\u4e2a\u9690\u6027\u76f8\u4f4d\uff0c\u65f6\u957f\u81f3\u5c11\u4e3a \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 \uff0c\u63a5\u7740\u662f\uff1a
\u2022 \u4e00\u4e2a\u663e\u6027\u76f8\u4f4d\uff0c\u65f6\u957f\u81f3\u5c11\u4e3a \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528<\/p>\n<\/p>\n

        Dominant or recessive bits between the above mentioned phases that are shorter than \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 and \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 respectively are ignored.<\/p>\n

      \u5ffd\u7565\u4e0a\u8ff0\u76f8\u4f4d\u4e2d\u77ed\u4e8e\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u548c\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u7684\u663e\u6027\u6216\u9690\u6027\u4f4d\u3002<\/p>\n

        The complete dominant-recessive-dominant pattern must be received within \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 to
be recognized as a valid wake-up pattern. Otherwise, the internal wake-up logic is reset. The complete wake-up pattern will then need to be retransmitted to trigger a wake-up event. Pin RXD remains HIGH until the wake-up event has been triggered.<\/p>\n

    \u5b8c\u6574\u7684\u663e\u6027-\u9690\u6027-\u663e\u6027\u6a21\u5f0f\u5fc5\u987b\u5728\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u65f6\u95f4\u5185\u63a5\u6536\u5230\uff0c\u624d\u80fd\u88ab\u8bc6\u522b\u4e3a\u4e00\u4e2a\u6709\u6548\u7684\u5524\u9192\u6a21\u5f0f\u3002\u5426\u5219\uff0c\u5185\u90e8\u5524\u9192\u903b\u8f91\u5c06\u4f1a\u88ab\u91cd\u7f6e\u3002\u7136\u540e\u9700\u8981\u91cd\u65b0\u4f20\u8f93\u5b8c\u6574\u7684\u5524\u9192\u6a21\u5f0f\u4ee5\u89e6\u53d1\u5524\u9192\u4e8b\u4ef6\u3002\u5728\u89e6\u53d1\u5524\u9192\u4e8b\u4ef6\u4e4b\u524d\uff0c\u5f15\u811aRXD\u4fdd\u6301\u9ad8\u7535\u5e73\u3002<\/p>\n

        After a wake-up sequence has been detected, the TJA1044 will remain in Standby mode
with the bus signals reflected on RXD. Note that dominant or recessive phases lasting less than \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 will not be detected by the low-power differential receiver and will not be reflected on RXD in Standby mode.<\/p>\n

    \u68c0\u6d4b\u5230\u5524\u9192\u5e8f\u5217\u540e\uff0cTJA1044\u5c06\u4fdd\u6301\u5f85\u673a\u6a21\u5f0f\u5e76\u5c06\u603b\u7ebf\u4fe1\u53f7\u53cd\u5c04\u5230RXD\u5f15\u811a\u4e0a\u3002\u8bf7\u6ce8\u610f\uff0c\u6301\u7eed\u65f6\u95f4\u5c0f\u4e8e\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u7684\u663e\u6027\u6216\u9690\u6027\u76f8\u4f4d\u5c06\u4e0d\u4f1a\u88ab\u4f4e\u529f\u7387\u5dee\u5206\u63a5\u6536\u673a\u68c0\u6d4b\u5230\uff0c\u5e76\u4e14\u5728\u5f85\u673a\u6a21\u5f0f\u4e0b\u4e0d\u4f1a\u53cd\u5c04\u5230RXD\u5f15\u811a\u4e0a\u3002<\/p>\n

        A wake-up event is not flagged on RXD if any of the following events occurs while a valid
wake-up pattern is being received:<\/p>\n

     \u5982\u679c\u5728\u4e00\u4e2a\u5524\u9192\u6a21\u5f0f\u88ab\u63a5\u6536\u5230\uff0c\u800c\u4ee5\u4e0b\u4e8b\u4ef6\u4e2d\u7684\u4efb\u4f55\u4e00\u4e2a\u51fa\u73b0\uff0c\u5219\u5524\u9192\u65f6\u95f4\u5c06\u4e0d\u4f1a\u5728RXD\u5f15\u811a\u88ab\u6807\u8bb0\uff1a<\/p>\n

\u2022 The TJA1044 switches to Normal mode
\u2022 The complete wake-up pattern was not received within\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528
\u2022 A \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 or \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 undervoltage is detected (\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 < \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 or \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 <\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528;<\/p>\n

\u2022 TJA1044\u5207\u6362\u81f3\u6b63\u5e38\u6a21\u5f0f
\u2022 \u6ca1\u6709\u5728\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u5185\u6536\u5230\u5b8c\u6574\u7684\u5524\u9192\u6a21\u5f0f\u200b\u200b\u200b\u200b\u200b\u200b\u200b
\u2022 \u4e00\u4e2a\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 \u6216\u8005 \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 \u4f4e\u538b\u88ab\u68c0\u6d4b\u5230 (\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 < \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 or \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 <\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528;<\/p>\n

 \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528<\/p>\n<\/p>\n

 7.3 Fail-safe features<\/p>\n

      \u6545\u969c\u4fdd\u62a4\u529f\u80fd<\/p>\n

7.3.1 TXD dominant time-out function<\/p>\n

    TXD\u5f15\u811a\u663e\u6027\u8d85\u65f6\u529f\u80fd<\/p>\n

        A 'TXD dominant time-out' timer is started when pin TXD is set LOW. If the LOW state on
this pin persists for longer than \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528, the transmitter is disabled, releasing the bus
lines to recessive state. This function prevents a hardware and\/or software application
failure from driving the bus lines to a permanent dominant state (blocking all network
communications). The TXD dominant time-out timer is reset when pin TXD is set HIGH.
The TXD dominant time-out time also defines the minimum possible bit rate of
approximately 25 kbit\/s.<\/p>\n

        \u5f15\u811aTXD\u8bbe\u7f6e\u4e3a\u4f4e\u7535\u5e73\u65f6\uff0c\u4e00\u4e2a\u201cTXD\u5f15\u811a\u663e\u6027\u8d85\u65f6\u201d\u8ba1\u65f6\u5668\u5c06\u88ab\u542f\u52a8\u3002\u5982\u679cTXD\u5f15\u811a\u4e0a\u7684\u4f4e\u7535\u5e73\u72b6\u6001\u6301\u7eed\u65f6\u95f4\u8d85\u8fc7\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\uff0c\u53d1\u9001\u5668\u88ab\u7981\u7528\uff0c\u91ca\u653e\u603b\u7ebf\u7ebf\u5230\u9690\u6027\u72b6\u6001\u3002\u6b64\u529f\u80fd\u53ef\u9632\u6b62\u786c\u4ef6\u548c\/\u6216\u8f6f\u4ef6\u5e94\u7528\u7a0b\u5e8f\u5c06CAN\u603b\u7ebf\u7ebf\u8def\u9a71\u52a8\u5230\u6c38\u4e45\u663e\u6027\u72b6\u6001\uff08\u963b\u585e\u6240\u6709\u7684\u7f51\u7edc\u901a\u8baf\uff09\u3002\u5f15\u811aTXD\u8bbe\u7f6e\u4e3a\u9ad8\u7535\u5e73\u65f6\uff0cTXD\u5f15\u811a\u663e\u6027\u8d85\u65f6\u5b9a\u65f6\u5668\u590d\u4f4d\u3002TXD\u5f15\u811a\u663e\u6027\u8d85\u65f6\u65f6\u95f4\u8fd8\u5b9a\u4e49\u4e86\u6700\u5c0f\u53ef\u80fd\u6bd4\u7279\u7387\u5927\u7ea6\u4e3a25 kbit\/s\u3002\u3010\u5373\u53d1\u90011bit\u65f6\u95f4\u6700\u957f\u4e3a40us\uff0c\u5b9a\u65f6\u5668\u65f6\u957f\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u4e5f\u4e3a40us\uff0c\u5982\u679c\u53d1\u90011bit\u65f6\u95f4\u5927\u4e8e40us\uff0c\u5219\u5224\u65ad\u5b9a\u65f6\u5668\u8d85\u65f6\uff0c\u53d1\u9001\u5668\u88ab\u7981\u7528\u3002\u5373\u6bd4\u7279\u7387\u5fc5\u987b\u5927\u4e8e\u7b49\u4e8e25 kbit\/s\u3011<\/p>\n

7.3.2 Internal biasing of TXD and STB input pins<\/p>\n

     TXD\u548cSTB\u8f93\u5165\u5f15\u811a\u7684\u5185\u90e8\u504f\u7f6e<\/p>\n

        Pins TXD and STB have internal pull-ups to \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 (\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 for variants with a \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 pin) to ensure a safe, defined state in case one or both of these pins are left floating. Pull-up currents
flow in these pins in all states; both pins should be held HIGH in Standby mode to
minimize supply current.      <\/p>\n

        \u5f15\u811aTXD\u548cSTB\u5177\u6709\u5185\u90e8\u4e0a\u62c9\u529f\u80fd\uff0c\u4e0a\u62c9\u5230\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\uff08\u6216\u8005\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 \uff0c\u5bf9\u4e8e\u5e26\u6709\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u5f15\u811a\u7684\u82af\u7247\u53d8\u79cd\uff09\uff0c\u4ee5\u786e\u4fdd\u4e00\u79cd\u5b89\u5168\u7684\u5b9a\u4e49\u7684\u72b6\u6001\uff0c\u4ee5\u9632\u5176\u4e2d\u4e00\u4e2a\u6216\u4e24\u4e2a\u5f15\u811a\u90fd\u5904\u4e8e\u6d6e\u52a8\u72b6\u6001\u3002\u5728\u6240\u6709\u72b6\u6001\u4e0b\uff0c\u4e0a\u62c9\u7535\u6d41\u5728\u8fd9\u4e9b\u5f15\u811a\u4e2d\u6d41\u52a8\uff1b\u5728\u5f85\u673a\u6a21\u5f0f\u4e0b\uff0c\u4e24\u4e2a\u5f15\u811a\u5e94\u4fdd\u6301\u9ad8\u4f4d\uff0c\u4ee5\u4f7f\u5f97\u7535\u6e90\u7535\u6d41\u6700\u5c0f\u5316\u3002<\/p>\n<\/p>\n

7.3.3 Undervoltage detection on pins \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 and \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528<\/p>\n

    \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u5f15\u811a\u548c\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u5f15\u811a\u7684\u6b20\u538b\u68c0\u6d4b<\/p>\n

         If \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 drops below the standby undervoltage detection level, \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528, the transceiver switches to Standby mode. The logic state of pin STB is ignored until VCC has recovered.
        In versions with a\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 pin, if \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 drops below the switch-off undervoltage detection level
(\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528), the transceiver switches off and disengages from the bus (zero load) until
VIO has recovered.
        In versions without a \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 pin, if \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 drops below the switch-off undervoltage detection
level\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528, the transceiver switches off and disengages from the bus (zero
load) until VCC has recovered.<\/p>\n<\/p>\n

        \u5982\u679c\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u4f4e\u4e8e\u8fdb\u5165\u5f85\u673a\u6a21\u5f0f\u7684\u6b20\u538b\u6c34\u5e73\u3010\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u3011\uff0c\u6536\u53d1\u5668\u5c06\u5207\u6362\u81f3\u5f85\u673a\u6a21\u5f0f\u3002\u5f15\u811aSTB\u7684\u903b\u8f91\u72b6\u6001\u88ab\u5ffd\u7565\uff0c\u76f4\u5230\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u6062\u590d\u5230\u6b63\u5e38\u7535\u538b\u6c34\u5e73\u3002<\/p>\n

        \u5e26\u6709\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u5f15\u811a\u7684\u82af\u7247\uff0c\u5982\u679c\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u4f4e\u4e8e\u5173\u65ad\u6b20\u538b\u68c0\u6d4b\u6c34\u5e73\uff08\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\uff09\uff0c\u6536\u53d1\u5668\u5173\u95ed\u5e76\u4e0e\u603b\u7ebf\u5206\u79bb\uff08\u96f6\u8d1f\u8f7d\uff09\uff0c\u76f4\u5230\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u6062\u590d\u5230\u6b63\u5e38\u7535\u538b\u6c34\u5e73\u3002<\/p>\n

        \u5e26\u6709\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u5f15\u811a\u7684\u82af\u7247\uff0c \u5982\u679c\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u4f4e\u4e8e\u8fdb\u5165\u5f85\u673a\u6a21\u5f0f\u7684\u6b20\u538b\u6c34\u5e73\u3010\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u3011\uff0c\u6536\u53d1\u5668\u5c06\u5207\u6362\u81f3\u5f85\u673a\u6a21\u5f0f\u3002\u5f15\u811aSTB\u7684\u903b\u8f91\u72b6\u6001\u88ab\u5ffd\u7565\uff0c\u76f4\u5230\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u6062\u590d\u5230\u6b63\u5e38\u7535\u538b\u6c34\u5e73\u3002<\/p>\n

7.3.4 Overtemperature protection<\/p>\n

        \u8d85\u6e29\u4fdd\u62a4<\/p>\n

        The output drivers are protected against overtemperature conditions. If the virtual junction
temperature exceeds the shutdown junction temperature, Tj(sd), both output drivers are
disabled. When the virtual junction temperature drops below Tj(sd) again, the output
drivers recover once TXD has been reset to HIGH. Including the TXD condition prevents
output driver oscillation due to small variations in temperature.<\/p>\n

        \u8f93\u51fa\u9a71\u52a8\u5668\u53d7\u5230\u8fc7\u6e29\u4fdd\u62a4\u3002\u5982\u679c\u6a21\u62df\u7ed3\u6e29\u5ea6\u8d85\u8fc7\u7ed3\u5173\u505c\u6e29\u5ea6Tj\uff08sd\uff09\uff0c\u4e24\u4e2a\u8f93\u51fa\u9a71\u52a8\u5668\u5747\u88ab\u7981\u6b62\u3002\u5f53\u6a21\u62df\u7ed3\u6e29\u5ea6\u518d\u6b21\u964d\u81f3Tj\uff08sd\uff09\u4ee5\u4e0b\u65f6\uff0c\u4e00\u65e6TXD\u5f15\u811a\u91cd\u7f6e\u4e3a\u9ad8\u7535\u5e73\uff0c\u8f93\u51fa\u9a71\u52a8\u5c31\u4f1a\u6062\u590d\u3002\u5305\u62ecTXD\u5f15\u811a\u7684\u7535\u5e73\u6761\u4ef6\u624d\u6062\u590d\u9a71\u52a8\uff0c\u53ef\u9632\u6b62\u7531\u4e8e\u6e29\u5ea6\u7684\u5fae\u5c0f\u53d8\u5316\u5bfc\u81f4\u8f93\u51fa\u9a71\u52a8\u5668\u51fa\u73b0\u632f\u8361\uff0c\u53cd\u590d\u7981\u6b62\u548c\u6062\u590d\u3002<\/p>\n

7.4 \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 supply pin (TJA1044x\/3 variants)<\/p>\n

        \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u7535\u6e90\u5f15\u811a\uff08TJA1044x\/3 \u53d8\u79cd\u3010TJA1044GT\/3\u3001TJA1044GTK\/3\u3011\u624d\u4f1a\u6709\u8be5\u5f15\u811a\uff09<\/p>\n<\/p>\n

        Pin\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 should be connected to the microcontroller supply voltage. This will adjust the signal levels of pins TXD, RXD and STB to the I\/O levels of the microcontroller.Pin \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528also provides the internal supply voltage for the low-power differential receiver in the transceiver. For applications running in low-power mode, this allows the bus lines to be monitored for activity even if there is no supply voltage on pin\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528.
        For variants of the TJA1044 without a \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 pin, all circuitry is connected to \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 (pin 5 is not
bonded). The signal levels of pins TXD, RXD and STB are then compatible with 5 V
microcontrollers. This allows the device to interface with both 3.3 V and 5 V-supplied
microcontrollers, provided the microcontroller I\/Os are 5 V tolerant.<\/p>\n<\/p>\n

        \u5f15\u811a\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u5e94\u8fde\u63a5\u5230\u5fae\u63a7\u5236\u5668\u7535\u6e90\u7535\u538b\u3002\u8fd9\u5c06\u628a\u5f15\u811aTXD\u3001RXD\u548cSTB\u7684\u7535\u5e73\u8c03\u6574\u4e3a\u5fae\u63a7\u5236\u5668\u7684I\/O\u7535\u5e73\u3002\u5f15\u811a\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u8fd8\u4e3a\u6536\u53d1\u5668\u4e2d\u7684\u4f4e\u529f\u7387\u5dee\u5206\u63a5\u6536\u5668\u63d0\u4f9b\u5185\u90e8\u7535\u6e90\u7535\u538b\u3002\u5bf9\u4e8e\u5728\u4f4e\u529f\u7387\u6a21\u5f0f\u4e0b\u8fd0\u884c\u7684\u5e94\u7528\u7a0b\u5e8f\uff0c\u5373\u4f7f\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u5f15\u811a\u4e0a\u6ca1\u6709\u7535\u6e90\u7535\u538b\uff0c\u4e5f\u53ef\u4ee5\u76d1\u63a7\u603b\u7ebf\u7684\u6d3b\u52a8\u3002<\/p>\n

        \u5bf9\u4e8e\u4e0d\u5e26\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\u5f15\u811a\u7684TJA1044\u82af\u7247\u53d8\u79cd\u578b\u53f7\uff0c\u6240\u6709\u7535\u8def\u90fd\u8fde\u63a5\u5230\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528\uff08\u5f15\u811a5\u672a\u8fde\u63a5\uff09\uff09\u3002\u5f15\u811aTXD\u3001RXD\u548cSTB\u7684\u4fe1\u53f7\u7535\u5e73\u4e0e5V\u5fae\u63a7\u5236\u5668\u517c\u5bb9\u3002\u8fd9\u5141\u8bb8\u8bbe\u5907\u4e0e3.3 V\u548c5 V\u7535\u6e90\u4f9b\u7535\u7684\u5fae\u63a7\u5236\u5668\u8fde\u63a5\uff0c\u524d\u63d0\u662f\u5fae\u63a7\u5236\u5668I\/O\u80fd\u627f\u53d75V\u3002<\/p>\n<\/p>\n

12. Application information<\/p>\n

     \u5e94\u7528\u4fe1\u606f<\/p>\n

   12.1 Application diagram<\/p>\n

    \u5e94\u7528\u7535\u8def\u56fe<\/p>\n

   \"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528<\/p>\n

\"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u7528 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n<\/p>\n<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"12V\u7684CAN\u6267\u884c\u5668_can\u603b\u7ebf\u5728\u6c7d\u8f66\u4e0a\u7684\u5e94\u75281\u3001Generaldescription\u6982\u8ff0TheTJA1044ispartoftheMantisfamilyofhigh-speedCANtranscei...","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"_links":{"self":[{"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/posts\/5998"}],"collection":[{"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/comments?post=5998"}],"version-history":[{"count":0,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/posts\/5998\/revisions"}],"wp:attachment":[{"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/media?parent=5998"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/categories?post=5998"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/tags?post=5998"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}