NCV7425EVB NCV7425 LIN Transceiver with Voltage Regulator and Reset Pin Evaluation Board User's Manual http://onsemi.com EVAL BOARD USER’S MANUAL Introduction NCV7425 Key Features This document describes the NCV7425EVB board for the ON Semiconductor NCV7425 LIN Transceiver with Voltage Regulator and Reset pin. The functionality and major parameters can be evaluated with the NCV7425EVB board. The NCV7425 is a fully featured local interconnect network (LIN) transceiver designed to interface between a LIN protocol controller and the physical bus. The NCV7425 LIN device is a member of the in-vehicle networking (IVN) transceiver family of ON Semiconductor that integrates a LIN v2.1 physical transceiver and a low-drop voltage regulator. It is designed to work in harsh automotive environment and is submitted to the TS16949 qualification flow. LIN-Bus Transceiver Evaluation Board Features One-row Pin Header Connecting to all Circuit Signals Enables Easy Insertion of the Evaluation Board into a more Complex Application Setup. The Header can be Alternatively Assembled either Perpendicular or Parallel with the Board Plane Oscilloscope Test-points on All Circuit Signals Reverse Protection and Decoupling on the Main (Battery) Supply Decoupling on VCC Regulator Output Additional Pull-up Resistor on the RSTN Open-drain Output Filtering Circuit on the Switch-monitoring WAKE Input On-board Local Wakeup Switch LIN-bus Termination and Optional ESD Protection Good Thermal Connection of the Circuit’s Exposed Pad to the Bottom Ground Plane Semiconductor Components Industries, LLC, 2011 November, 2011 − Rev. 0 LIN Compliant to Specification Revision 2.1 (Backward Compatible to Versions 2.0 and 1.3) and SAE J2602 Bus Voltage 45 V Transmission Rate up to 20 kBaud Integrated Slope Control for Improved EMI Compatibility Protection Thermal Shutdown Indefinite Short-circuit Protection on Pins LIN and WAKE Towards Supply and Ground Load Dump Protection (45 V) Bus Pins Protected against Transients in an Automotive Environment ESD Protection Level for LIN, INH, WAKE and Vbb up to 10 kV Voltage Regulator Two Device Versions: Output Voltage 3.3 V or 5 V for Loads up to 150 mA Under-voltage Detector with a Reset Output to the Supplied Microcontroller Over-current Limitation INH Output for Auxiliary Purposes (Switching of an External Pull-up or Resistive Divider towards Battery, Control of an External Voltage Regulator etc.) Typical Applications Automotive Industrial Network 1 Publication Order Number: EVBUM2045/D NCV7425EVB NCV7425 PIN CONNECTIONS 1 16 VCC LIN 2 15 RxD GND 3 14 TxD GND 4 13 RSTN WAKE 5 12 STB INH 6 11 EN OTP_SUP 7 10 TEST N.C. 8 9 N.C. Figure 1. NCV7425EVB SOIC−16 LEAD WIDE BODY EXPOSED PAD CASE 751AG Getting Started The EMC immunity of the Master-node device can be further enhanced by adding a capacitor between the LIN output and ground (CLIN). The optimum value of this capacitor is determined by the length and capacitance of the LIN bus, the number and capacitance of Slave devices, the pull-up resistance of all devices (Master and Slave), and the required time constant of the system. Master/Slave Configuration The NCV7425 evaluation board can be configured as Master or Slave node. Furthermore, Master node LIN bus pull-up resistance (RLIN) can be tied to VBB supply line or to INH pin (See the figures below). VBB NCV7425 VBB VBB INH LIN Bus VBB VBB INH NCV7425 RLIN VBB LIN Bus LIN CLIN INH NCV7425 RLIN NCV7425 LIN Bus LIN LIN CLIN CLIN Figure 2. Master with Pull-up to VBB VBB Figure 3. Master with Pull-up to INH Figure 4. Slave Configuration Basic Connection A simple LIN network configuration is shown in the figure below. One Master and one Slave node is required (Master/Slave Configuration). VBAT LIN GND MASTER Node GND MCU VCC SLAVE Node GND MCU VCC MASTER Figure 5. NCV7425 Evaluation Setup Connection http://onsemi.com 2 SLAVE NCV7425EVB Functional Description 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. NCV7425 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. Overall Functional Description NCV7425 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 150 mA for supplying any external components (microcontroller, CAN node, etc.). NCV7425 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. Operating States NCV7425 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 6 and Table 1. Table 1. MODE SELECTION Mode Vcc RxD INH LIN Transceiver 30 kW on LIN RSTN Normal – Slope (Note 1) ON Low = Dominant State High = Recessive State High if STB = High during State Transition; Floating Otherwise Normal Slope ON High Normal – Low Slope (Note 2) ON Low = Dominant State High = Recessive State High if STB = High during State Transition; Floating Otherwise Low Slope ON High Stand-by (Note 3) ON Low after LIN Wakeup, High Otherwise (Note 4) Floating OFF OFF Controlled by VCC Under-voltage Monitor Sleep OFF Clamped to Vcc (Note 4) Floating OFF OFF Low 1. The normal slope mode is entered when pin EN goes HIGH while TxD is in HIGH state during EN transition. 2. The low slope mode is entered when pin EN goes HIGH while TxD is in LOW state during EN transition. LIN transmitter gets on only after TxD returns to high after the state transition. 3. The stand-by mode is entered automatically after power-up. 4. In Stand-by and Sleep mode, the High state is achieved by internal pull-up resistor to VCC. Standby Mode VCC Under-voltage EN Changes 1 −> 0 while STB = 1 EN Changes 0 −> 1 while TxD = 1 EN Changes 1 −> 0 while STB = 1 VCC Under-voltage LIN or Local Wake-up Normal Mode (Low Slope) − VCC: On − LIN TRX: On − INH: High/Floating − LIN Term.: 30 kW − RxD Pin: LIN Data − RSTN Pin: High Normal Mode (Normal Slope) − VCC: On − LIN TRX: On − INH: High/Floating − LIN Term.: 30 kW − RxD Pin: LIN Data − RSTN Pin: High EN Changes 1 −> 0 while STB = 0 EN Changes 0 −> 1 while TxD = 0 Vbb Power-up − VCC: On − LIN TRX: Off − INH: Floating − LIN Term.: Current Source − RxD Pin: High/Low − RSTN Pin: VCC_UV Sleep Mode EN Changes 1 −> 0 while STB = 0 Figure 6. NCV7425 State Diagram − VCC: Off − LIN TRX: Off − INH: Floating − LIN Term.: Current Source − RxD Pin: at VCC − RSTN Pin: Low PD20090610.01 Additional details of the NCV7425 operation and parameters can be found in the corresponding datasheet [1]. http://onsemi.com 3 NCV7425EVB Schematic Figure 7. NCV7425 LIN Transceiver with Voltage Regulator and Reset Pin Evaluation Board Schematic Bill of Materials Table 2. NCV7425 Evaluation Board Bill of Materials Designator Description Value Footprint Manufacturer Manufacturer Part Number C1 Capacitor SMD 1.0 nF CAP0805 PHYCOMP 2238 580 15623 R1, R2 Resistor SMD 2.0 kW 1206 0.25 W R1206 WELWYN WCR 1206 2K 2% R3, R5 Resistor SMD 10 kW R0805 MULTICOMP MC 0.1 W 0805 1% 10K C7 Capacitor SMD 10 nF CAP0603 EPCOS B37931K5103K60 C5 Capacitor SMD X7R 10 mF 10 V X7R CAP1206 KEMET C1206C106K8RAC C3 Electrolytic Capacitor SMD 10 mF 50 V 6.3 x 6.3 SMD NICHICON UUD1H100MCL1GS R4 Resistor SMD 33 kW R0805 MULTICOMP MC 0.1 W 0805 1% 33K C4 Capacitor SMD 100 nF CAP0603 KEMET C0603C104K5RAC C2 Capacitor SMD (Optional) (Optional) CAP0805 (Optional) (Optional) D1 Diode SMD MRA4003 SMA ON Semiconductor MRA4003T3G D4 LIN bus ESD protection diode ESD LIN SOD323 (Optional) (Optional) L1 Resistor SMD (Optional Ferrite) 0R R0805 MULTICOMP MC 0.1W 0805 0R J1 SIL HEADER 12 pins Right Angle HEADER 1X12 HDR1x12 MOLEX 90121-0772 D2, D3 Switching Diode SMD MMSD4148 SOD123 ON Semiconductor MMSD4148T1G U1 LIN Transceiver with 3.3 V or 5 V Voltage Regulator NCV7425 SOIC16_WB_ EP ON Semiconductor 3.3 V: NCV7425DW0R2G 5 V: NCV7425DW5R2G SCOPEGND SCOPEGND; Wire Bridge SCOPEGND SCOPEGND - - SW1 SWITCH SMD SPNO 6 x 6 mm SMD SWITCH PB300 TYCO ELECTRONICS FSM2JSMA FT1, FT2, FT3, FT4 Rubber feet 12,7 x 12,7 x 5,8 SUPPORT FEET FEET 12,7 x 12,7 3M SJ5018BLACK TP1, TP2, TP4, TP5, TP7, TP8, TP9, TP10, TP11, TP12 Testpin 200 SER. Hole 1.0 Black TP S200 H1.0 BLACK TESTPIN2 VERO 20-2137 http://onsemi.com 4 NCV7425EVB PCB Drawings Assembly Drawings Figure 8. NCV7425EVB PCB Top Assembly Drawing Figure 9. NCV7425EVB PCB Bottom Assembly Drawing Composite Drawings Figure 10. NCV7425EVB PCB Top Composite Drawing Figure 11. NCV7425EVB PCB Bottom Composite Drawing (Mirrored) PCB Preview Figure 12. NCV7425EVB PCB Top Side View Figure 13. NCV7425EVB PCB Bottom Side View http://onsemi.com 5 NCV7425EVB References [1] On Semiconductor, NCV7425 Product Preview Revision P0, August 2011. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. 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