NCV74206V1GEVB

NCV7420EVB NCV7420 LIN Transceiver with Voltage Regulator Evaluation Board User's Manual http://onsemi.com EVAL BOARD USER’S MANUAL Introduction NCV7420 Key Features • LIN-Bus Transceiver This document describes the NCV7420EVB board for the ON Semiconductor NCV7420 LIN Transceiver with Voltage Regulator. The functionality and major parameters can be evaluated with the NCV7420EVB board. The NCV7420 is a fully featured local interconnect network (LIN) transceiver designed to interface between a LIN protocol controller and the physical bus. The NCV7420 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. • 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 Filtering Circuit on the Switch-monitoring WAKE Input On-board Local Wakeup Switch LIN-bus Termination and Optional ESD Protection © 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 ±12 kV Voltage Regulator ♦ Two Device Versions: Output Voltage 3.3 V or 5 V for Loads up to 50 mA ♦ 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: EVBUM2044/D NCV7420EVB NCV7420 PIN CONNECTIONS 1 14 VCC LIN 2 13 RxD GND 3 12 TxD GND 4 11 GND WAKE 5 10 STB INH 6 9 EN OTP_ZAP 7 8 TEST Figure 1. NCV7420EVB SOIC 14 D SUFFIX CASE 751AP 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 NCV7420 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 NCV7420 VBB VBB INH LIN Bus VBB VBB INH NCV7420 RLIN VBB LIN Bus LIN CLIN INH NCV7420 RLIN NCV7420 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. NCV7420 Evaluation Setup Connection http://onsemi.com 2 SLAVE NCV7420EVB 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. 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. Overall Functional Description 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. 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 6 and Table 1. Table 1. MODE SELECTION Mode Vcc RxD INH LIN transceiver 30 kW on LIN Normal – Slope (Note 1) ON Low = Dominant State High = Recessive State High if STB = High during state transition; Floating otherwise Normal Slope ON Normal – Low Slope (Note 2) ON Low = Dominant State High = Recessive State High if STB = High during state transition; Floating otherwise Low Slope ON Stand-by (Note 3) ON Low after LIN wakeup, high otherwise (Note 4) Floating OFF OFF Sleep OFF Clamped to Vcc (Note 4) Floating OFF OFF 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. Normal Mode (Normal Slope) Standby Mode EN goes from 1 to 0 while STB = 1 − VCC: On − LIN TX: On − INH: High/Floating − Term.: 30 kW − RxD: LIN Data EN goes from1 to 0 while STB = 0 EN goes from 1 to 0 while STB = 1 − VCC: On − LIN TX: Off − INH: Floating − Term.: Current Source − RxD: High/Low EN goes from 0 to 1 while TxD = 0 Power-up Vbb EN goes from 0 to 1 while TxD = 1 Local Wake-up or LIN Wake-up Normal Mode (Low Slope) − VCC: On − LIN TX: On − INH: High/Floating − Term.: 30 kW − RxD: LIN Data Sleep Mode EN goes from 1 to 0 while STB = 0 − VCC: Off − LIN TX: Off − INH: Floating − Term.: Current Source − RxD: = VCC Figure 6. NCV7420 State Diagram PD20090610.01 Additional details of the NCV7420 operation and parameters can be found in the corresponding datasheet [1]. http://onsemi.com 3 NCV7420EVB Schematic Figure 7. NCV7420 LIN Transceiver with Voltage Regulator Evaluation Board Schematic Bill of Materials Table 2. NCV7420 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 Resistor SMD 10 kW R0805 MULTICOMP MC 0.1W 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 0.1W 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 NCV7420 SOIC14 ON Semiconductor 3.3 V: NCV7420D24R2G 5 V: NCV7420D26R2G 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, TP10, TP11, TP12 Testpin 200 SER. Hole 1.0 Black TP S200 H1.0 BLACK TESTPIN2 VERO 20-2137 http://onsemi.com 4 NCV7420EVB PCB Drawings Assembly Drawings Figure 8. NCV7420EVB PCB Top Assembly Drawing Figure 9. NCV7420EVB PCB Bottom Assembly Drawing Composite Drawings Figure 10. NCV7420EVB PCB Top Composite Drawing Figure 11. NCV7420EVB PCB Bottom Composite Drawing (Mirrored) PCB Preview Figure 12. NCV7420EVB PCB Top Side View Figure 13. NCV7420EVB PCB Bottom Side View http://onsemi.com 5 NCV7420EVB References [1] On Semiconductor, NCV7420 Product Preview Revision 0.5, July 2010 http://onsemi.com 6 onsemi, , and other names, marks, and brands are registered and/or common law trademarks of Semiconductor Components Industries, LLC dba “onsemi” or its affiliates and/or subsidiaries in the United States and/or other countries. onsemi owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. 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