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NCV7420D24R2G Datasheet(PDF) 4 Page - ON Semiconductor |
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NCV7420D24R2G Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 21 page NCV7420 http://onsemi.com 4 Figure 2. Typical Application Diagram KL30 LIN−BUS KL31 LIN Master Node GND Micro controller GND INH VBB VBAT GND WAKE LIN Slave Node GND Micro controller VBAT GND WAKE 10uF VCC VCC 10uF 100nF TEST OTP_ZAP GND INH VBB VCC TEST OTP_ZAP LIN WAKE 10uF 100nF VCC LIN WAKE EN STB TxD RxD EN STB TxD RxD 10uF Table 4. PIN DESCRIPTION Pin Name Description 1 VBB Battery supply input 2 LIN LIN bus output/input 3 GND Ground 4 GND Ground 5 WAKE High voltage digital input pin to switch the part from sleep− to standby mode 6 INH Inhibit output 7 OTP_ZAP Supply for programming of trimming bits at factory testing, should be grounded in the application 8 TEST Digital input for factory testing, should be grounded in the application 9 EN Enable input, transceiver in normal operation mode when high 10 STB Standby mode control input 11 GND Ground 12 TxD Transmit data input, low in dominant state 13 RxD Receive data output; low in dominant state; push−pull output 14 Vcc Supply voltage (output) Overall Functional Description LIN is a serial communication protocol that efficiently supports the control of mechatronic nodes in distributed automotive applications. The domain is class−A multiplex buses with a single master node and a set of slave nodes. NCV7420 is designed as a master or slave node for the LIN communication interface with an integrated 3.3 V or 5 V voltage regulator having a current capability up to 50 mA for supplying any external components (microcontroller). NCV7420 contains the LIN transmitter, LIN receiver, voltage regulator, power−on−reset (POR) circuits and thermal shutdown (TSD). The LIN transmitter is optimized for the maximum specified transmission speed of 20 kBaud with EMC performance due to reduced slew rate of the LIN output. The junction temperature is monitored via a thermal shutdown circuit that switches the LIN transmitter and voltage regulator off when temperature exceeds the TSD trigger level. NCV7420 has four operating states (normal mode, low slope mode, stand−by mode, and sleep mode) that are determined by the input signals EN, WAKE, STB, and TxD. Operating States NCV7420 provides four operating states, two modes for normal operation with communication, one stand-by without communication and one low power mode with very low current consumption. See Figure 3. |
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