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Si86xxCOM-EVBS i 8 6 X X C M O S D I G I TA L I S O L A T O R - B A S E D S E R I A LI N T E R F A C E U S E R ’S G U I D E1. IntroductionSI86xx devices are CMOS-based galvanic isolators (1 kV/2.5 kV/5 kV) designed for industrial, commercial, andmedical isolation applications. They are available in various channel counts (1/2/3/4/5/6), speeds (1 and150 Mbps), and options in two package options (narrow and wide body SOIC). They are also available inunidirectional or bidirectional (I2C) channels option.2. Kit ContentsThe Si86xxCOM Evaluation Board contains the following items: Si86xxCOM evaluation board show casing: Si8642BB4-channel unidirectional 1 Mbps digital isolator, narrow body, 2.5 kV2-channel unidirectional 150 Mbps digital isolator, narrow body, 2.5 kV Si8622ED 2-channel unidirectional 1 Mbps digital isolator, wide body, 5 kV**Note: The creepage and clearance are defined by the narrow-body SOIC (2.5 kV) isolators used in the EVB and must NOT beused for 5 kV isolation testing. Si8621BB2.1. Hardware OverviewThe Si86xxCOM Evaluation Board implements the isolated physical layer for RS232, RS422/485, and CAN busserial transceivers. Key features include:Isolated RS232 transceiver: Maximum data rate of 1 Mbps. Isolated TXD, RXD, RTS, and CTS signals withDB9 connector interface. Isolated 4 Wire RS422/485: Maximum data rate of 52 Mbps; failsafe full duplex with passive flow control. DB9and RJ45 connectors. Isolated CAN Bus: Maximum data rate of 1 Mbps, which implements the ISO 11898-3 physical layer and DB9connector.A top-level hardware block diagram is shown in Figure 1. The RS232 and RS422/RS485 isolated transceiversoperate as a repeater, and the CAN Bus interface operates as an isolated controller-side interface. Figure 1. Top-Level Hardware OverviewRev. 0.1 4/15Copyright 2015 by Silicon LaboratoriesSi86xxCOM-EVB

Si86xxCOM-EVBFigure 2. Si86xxCOM Evaluation BoardThe evaluation board photo of Figure 2 shows the Silicon Labs Si86xx digital isolators placed at the center of theboard. The RS232 and 422/485 isolated transceivers are implemented with narrow-body, 2.5 kV Si8642BB andSi8621BB digital isolators. The medical grade CAN bus interface is implemented with a wide-body Si8622EDdigital isolator rated at 5 kV.**Note: The creepage and clearance are defined by the narrow-body SOIC (2.5 kV) isolators used in the EVB and must NOT beused for 5 kV isolation testing.3. Required Equipment Two dc power supplies (isolated)Two red and black banana-to-banana cablesOne straight-through RS232 cable (3'3, 2'2) (e.g. StarTech Model#MXT100 25)One crossover (null modem) RS232 cable (3'2, 2'3) (e.g. StarTech Model # SCNM9FM)One PC with COM1 portSi86xxCOM evaluation board (under test)Si86xxCOM User's Guide (this document)3.1. Optional Equipment(User Can Test the Functionality of Standalone EVB Using the Following Equipment)One 4-channel oscilloscope, 250 MHz BW (e.g., TDS784A)Dual output Pattern/Function generator, 80 MHz data rate (e.g., Agilent 81104A) Two BNC to hook cable (e.g., Pomona #3788) 2Rev. 0.1

Si86xxCOM-EVB4. Hardware Overview and DemoThe Si86xxCOM evaluation board operates from 4.75 to 5.25 V. Each isolated interface is enabled or disabled byjumper option settings as shown in Figures 3, 4, and 5 (RS232, RS422/485 and CAN Bus isolated interfaces,respectively).Refer to Figure 3:J3,J5J9,J6 J15,J16 J1,J2 J4,J7,J8,J10Refer to Figure 4:Connector for 5 V bus (J3) and GND(J5) planeConnector for 5VISO bus (J9) and ISOGND(J6) planeHeader 2x1, Supply for RS232 interfaceDB9 Female (J1) and Male (J2) connector for RS232Header 2x1, RS232 loopback test enable J17, J18J11,J12 RJ1,RJ2Refer to Figure 5:Header 2x1, Supply for RS422/485 interfaceDB9 Female (J1) and Make (J2) connector for RS422/485RJ45 connector for RS422/485J19,J20 J13,J14Header 2x1, Supply for CAN Bus interfaceDB9 Female (J13) and Male (J14) connector for CAN bus Figure 3. Power Supply Input and Isolated RS232 InterfaceRev. 0.13

Si86xxCOM-EVBFigure 4. Isolated 4-Wire R422/485 InterfaceFigure 5. Isolated CAN Bus Interface4.1. Common Board SetupPerform the following steps for a common board setup:1. Turn on the dc power supplies, and set the output voltage to 5.0 V, 500 mA current limit.2. Connect red banana cables to each of the positive outputs of the power supply, and connect the black bananacables to the respective negative or 0 V output.3. Turn off the dc power supply.4. Connect the other end of one of the red banana cables to J3 ( 5 V) and the other end of the second red bananacable to J9 ( 5VISO).5. Connect the other end of the black banana cable to J5 (GND) and J6 (ISOGND), respectively.This completes the power supply connections to the board.4Rev. 0.1

Si86xxCOM-EVB4.2. Isolated RS232 interface SetupPerform the following steps for an isolated RS232 interface setup:1. Power up a PC with the COM1 port (Male DB9 connector).2. Connect one end of the straight-through RS232 cable to the COM1 port and the other end to J1 of theevaluation board. Table 1 lists the standard pin definitions of the interface.Table 1. Isolated RS232 Pin DefinitionsJ1 DB9 (Female)PinoutRS232 Signal NameJ2 DB9 TS83. On the J2 side, use straight-through cable when connecting to DCE (Modem) and crossover cable whenconnecting to DTE (PC, printers, PLCs etc). Refer to Figures 6 and 7.4. Shunt jumpers J15 and J16 to apply power to the circuit.5. Turn ON the dc power supply.The board under test is ready to transfer data.**Note: Most PCs support data rates up to 115 kbps, but the onboard transceiver and isolator can support a maximum data rateof 1 Mbps.Figure 6. DTE to DCE ConnectionRev. 0.15

Si86xxCOM-EVBFigure 7. DTE to DTE Connection4.3. Isolated RS422/485 Interface SetupThe RS422 and RS485 standards are based on a balanced differential line. The RS422 interface is typicallyimplemented as a 4-wire, point-to-point communication system, whereas RS485 can be implemented in a 2-wire or4-wire multipoint configuration.Note: This EVB implements a full-duplex, isolated 4-wire RS422/RS485 interface with automatic flow control and should NOTbe used to implement a 2-wire interfacePlease note that the RS422/485 standard does not recommend a specific connector or pinout like the RS232standard. In light of this, the EVB has DB9 and 8-pin-RJ45 connectors for flexibility, allowing the user to chooseand follow the pinout definition table for proper cabling.Proper termination is required at each end of the cable for reliable communication links and long wiring runs. TheEVB has place holders (RTERM1-4) for termination resistors to match the characteristic impedance of the cablespecified by the manufacturer. A typical value is around 120 . The RS422/RS485 transceivers used in the EVBhave 22 k receiver input resistance and a fail-safe feature that guarantees the receiver output HIGH when inputsare left open or shorted.Perform the following steps for interface setup:1. Turn off the dc power supplies (if they are not turned off already).2. Shunt jumpers J17 and J18 to apply power to the circuit.3. Refer to Table 2 for the RS422/485 connector pinout definition. Make sure the cable is made to this pinoutdefinition.4. Recommended cables are 24 AWG 2 twisted pair with shield (e.g., Belden 9842-500).5. A simple 4-wire master slave point-to-point connection is shown in Figure 8 for reference.Connect the transmitter output of the master node to the receiver input (J12.1 and J12.2) of the EVB board.Connect the transmitter output (J12.3 and J12.4) of the EVB to the receiver input of the master node. Connect the isolated transmitter output (J11.1 and J11.2) of the EVB board to the receiver input of the slavenode. Connect the transmitter output of the slave node to the isolated receiver input (J11.4 and J11.3) of theEVB.6. Turn on the dc power supply. 7. The EVB is ready for data transfer and can support a maximum data rate of 52 Mbps.6Rev. 0.1

Si86xxCOM-EVBTable 2. RS422/485 Pinout Definition for DB9 and RJ45 ConnectorJ12(Female DB9)PinoutRS422/485 SignalNameJ11(Male DB9) PinoutRS422/485 SignalName1A (RxD )1Y(TxD )2B (RxD–)2Z(TxD–)3Z (TxD–)3B(RxD–)4Y (TxD )4A(RxD )5GND5GND6,7,8,9NC6,7,8,9NCRJ1PinoutRS422/485 SignalNameRJ2PinoutRS422/485 SignalName1,7,8NC1,7,8NC2Y (TxD )2A (RxD )3Z (TxD–)3B(RxD–)4GND4GND5B (RxD–)5Z (TxD–)6A (RxD )6Y (TxD )Figure 8. Simple Point-to-Point RS422/485 ConnectionRev. 0.17

Si86xxCOM-EVB4.4. Isolated CAN Bus Interface SetupCAN (Controller Area Network) Bus is a bidirectional, 2-wire (CANH and CANL) differential signaling bus with adata rate up to 1 Mbps. The CAN bus signal has two states: recessive (logic High) and dominant (logic Low). Whenno driver is active, the bus is in the recessive state (CANH CANL). The non-bus side of the transceiver isconnected to a controller. The EVB implements an isolated controller-side CAN interface as shown in Figure 1. Thespeed/slope control resistor RSPD is tied to GND for high-speed (1 Mbps) operation. Users can increase the valueof resistor RSPD for slower operation.The CAN bus must be properly terminated at each end of the cable. The EVB comes with a standard termination of120 (RTERM8) installed. The Si8622ED digital isolator powers up with default high output making sure the CANbus is in a recessive state.Perform the following steps for interface setup:1. Turn the power supply off, if it is not off already.2. Shunt jumpers J19 and J20 to apply power to the circuit.3. Standard twisted pair (24 AWG, ex HYCANBUS0901) with or without shield can be used. Refer to Table 3 forpinout definition. Make sure the cable is made to this pinout definition.4. A typical connection to the EVB is shown in Figure 9.Connect the controller side driver output and receiver input to the J13.3 (DR) and J13.2 (RX) pins of EVBrespectively. Connect the CANH (J14.7) and CANL (J14.2) of the EVB to the bus lines.5. Turn on the dc power supply. The EVB is ready for data transfer and can support a maximum data rate of 1 Mbps.Table 3. CAN Bus Interface Pinout DefinitionJ13(Female DB9)PinoutCAN BusSignal NameJ14(Male DB9)PinoutCAN BusSignal Name1,4,6,7,8,9NC1,4,5,6,8,9NC2RX(Receiver Output)2CANL3DR (Driver Input)3,6GND5GND7CANHFigure 9. Isolated CAN Bus Interface Connection8Rev. 0.1

J1DB9Rev. C30CTSRXDRTSTXD82614713C31uFC15C1 C1-C2 C2-T1INT2INR1OUTR2OUT0.1uFV V-T1OUTT2OUTR1INR2INGauranteed 460 kbit/sOperates From a Single 3.3V- 5.5V Power SupplySP3232EH/MAX3232 RS232 TxRx F0.47uFTP3TP4TP2 5V0 RS2321uFC1J1576543Si8642EN1A4A3A2A1IC1 5V0 RS232EN2B4B3B2B11011121314 5V0 ISORS232TP5TP6TP71uFTP24C12C11ISOGNDC10 5V0 ISORS2320.1uFC14J16 5V ISO0.47uF0.1uF54319121011Figure 10. Isolated RS232 Interface Schematic 5V0 RS23213451110129TP10.1uFC6 5VISOLATIONIsolated RS232 TT2INT1INC2-C2 C1-C1 U2R2INR1INT2OUTT1OUTV-V 5V0 ISORS23216VCCGND15GNDTXD ISORTS ISORXD ISOCTS P250.47uFC32ISOGNDRXD ISORTS ISOTXD ISOCTS ISOTP57TP56TP55J2DB9 MALE RA162738495Si86xxCOM-EVB5. Schematics9

Rev. BIAS2VCC 5.0VLow supply current: 7mA maxDesigned for 52 Mbps operationRS-485/RS-422 protocol compatibleNIRBIAS1 5V0 RS485LTC1686 RS422/485 TxRx Spec:TP48TP45TP44TP30Molex RJ45SHLD1SHLD2PAIR4 1PAIR4 2PAIR3 1PAIR3 2PAIR2 1PAIR2 2PAIR1 1PAIR1 211uFC90.1uFC17J17 5V0 RS485TP13TP121uFC7 5V32Si8621A2A1IC2 5V0 RS485B2B167 5V0 ISORS4851uF0.1uFTP15TP14C8C18J18 5V ISOISOGND1234VDDRDGNDLTC1686ABZY0.1uF1uFU4C20C13 5V0 ISORS4858765NIRBIAS4NITP19TP17RBIAS3 5V0 ISORS485Figure 11. Isolated RS422/485 Interface lated RS485 DB9 MALE RATP52TP51TP50TP29Molex RJ45SHLD1SHLD2PAIR4 1PAIR4 2PAIR3 1PAIR3 2PAIR2 1PAIR2 2PAIR1 1PAIR1 2ISOGND162738495Si86xxCOM-EVB

Rev. 0.11uF87654321NCGND1NCA2A1VDD1NCGND1IC3 5V0 CANSi8622GND2NCNCB2B1VDD2NCGND2910111213141516 5V0 1GNDTXDU6TP434321Figure 12. Isolated CAN bus Interface Schematic1uFC27 5V0 ISOCANRISODISO1uFTP33C23C24ISOGND0.1uFJ20 5V ISO* Si8622ED Default High Output is required for CAN interfaceTP32TP31C21C22J190.1uF 5V*Other pin compatible CAN TxRx are L9616-ND & SN65HVD10501Mbps data rate5V operationPCA82C251T/N3* CAN TxRx solated CAN Bus 37TP39 TP41J14DB9 MALE RA162738495Si86xxCOM-EVB11

Si86xxCOM-EVB6. Si86xxCOM Bill Of MaterialsTable 4. Si86xxCom Bill of MaterialsQuantityReferenceValueVoltage ToleranceTypeManufacturerPNManufacturer11C1, C3, C4, C7, C8, C9,C10, C13, C21, C23, C271 µF16 V 20%X7RC0805X7R160-105M Venkel6C2, C12, C29, C30, C31,C320.47 µF16 V 10%X7RC0805X7R160-474K Venkel13C5, C6, C11, C14, C15,C16, C17, C18, C19, C20,C22, C24, C280.1 µF16 V 10%X7RC0805X7R160-104K i8622ED-B-ISSiLabs3J1, J12, J13DB9D-SUBD09S33E4GX00LFFCI3J2, J11, J14DB9 MALERAD-SUBD09P33E4GX00LFFCI2J3, J9REDBANANA111-0702-001Johnson/Emerson11J4, J7, J8, J10, J15, J16,J17, J18, J19, J20, J21JUMPERHeaderTSW-102-07-T-SSamtec2J5, J6BLACKBANANA111-0703-001Johnson/Emerson4MH1, MH2, MH3, MH44-40HDWNSS-4-4-01RichcoPlastic Co1PCB1Si86xxCOM-EVBREV 1.0PCBSi86xxCOM-EVBREV 1.0SiLabs2RJ1, RJ2Molex RJ451RPU11K1RSPD01RTERM84SO1, SO2, SO3, SO412120Connector 85505-5113 1%ThickFilm CR0805-10W-1001F VenkelThickFilm CR0805-10W-000 1%STANDOFFVenkelThickFilm CR0805-10W-1200F VenkelHDWRev. 0.1Molex1902DKeystoneElectronics

Si86xxCOM-EVBTable 4. Si86xxCom Bill of Materials (Continued)QuantityReferenceValue55TP1, TP2, TP3, TP4, TP5,TP6, TP7, TP8, TP9, TP10,TP11, TP12, TP13, TP14,TP15, TP16, TP17, TP18,TP19, TP20, TP