EVM TEST PROCEDURE SN65HVD257D CAN EVM CAN Transceivers with Fast Loop Times for Highly Loaded Networks and Features For Functional Safety Networks REVISION: A By: Scott Monroe and Jason Blackman
REVISION HISTORY DATE REV DESCRIPTION BY WHOM 08-22- 2012 A INITIAL CREATION SCOTT MONROE JASON BLACKMAN SPECIAL NOTES DATE DESCRIPTION BY WHOM
TABLE OF CONTENTS 1.0 Parameter: Installation Checkout... 4 2.0 Parameter: Functionality... 5
1.0 Parameter: Installation Checkout Verify the SN65HVD257D devices (U1 & U6) and supporting logic gates (U2, U3, U4, U5) are installed correctly. (All passive components were inspected prior to device installation) 1.1 Definition: Component Verification Inspect the markings on the SN65HVD257D devices to insure it is the correct component with production symbolization. Inspect the other logic gates symbolization for correct installation and component. FIGURE 1. Top side of SN65HVD257 CAN EVM
Figure 1. SN65HVD257 CAN EVM Schematic
Bill of Material (BOM) Item Quantity Reference Part Footprint Manufacturer 1 23 C1,C3,R4,C4,C6,R10,C10,C11,C15,C16,C17,R18,C 19,C20,C21,R22,R23,C23,R24,C24,C26,R28,R34 DNI 805 ANY 2 4 C2,C5,C22,C25 DNI 603 ANY 3 2 C7,C27 4.7uF 603 ANY 4 4 C8,C9,C18,C29 0.1uF 603 ANY 5 1 C12 10uF 1206 ANY 6 1 C13 1uF 603 ANY 7 1 C14.1uF 402 ANY 8 1 C28 1nF 805 ANY 9 4 D1,D2,D4,D5 DNI SOT_3DBZ ANY 10 1 D3 GREEN C170 ANY 11 2 D6,D7 DNI CA05M2S10T100HG EPCOS 12 1 JMP1 Header 1x12 HDR_THVT_1X12_100 ANY 13 2 JMP2,JMP8 Header 1x3 HDR_THVT_1X3_100 ANY 14 2 JMP3,JMP7 Header 1x5 HDR_THVT_1X5_100 ANY 15 6 JMP4,JMP6,JMP9,JMP11,JMP12,JMP13 Header 1x2 HDR_THVT_1X2_100 ANY 16 2 JMP5,JMP10 Header 1x4 HDR_THVT_1X4_100 ANY 17 2 L1,L2 DNI M2022_Common-Mode_Choke TDK / EPCOS 18 4 R1,R16,R25,R40 4.7k 805 ANY 19 11 R2,R3,R8,R15,R17,R20,R21,R26,R27,R32,R39 0 805 ANY 20 4 R5,R13,R29,R37 DNI 1210 ANY 21 5 R6,R14,R19,R30,R38 330 805 ANY 22 4 R7,R11,R31,R35 0 1206 ANY 23 4 R9,R12,R33,R36 120 2512 ANY 24 6 R41,R42,R43,R44,R45,R46 10k 805 ANY 25 1 R47 3.3k 805 ANY 26 1 TB1 2PIN_TERMINAL_BLOCK TB_THRTSCR_1x2_100 ANY 27 18 TP4,TP5,TP6,TP7,TP8,TP9,TP10,TP11,TP12,TP13,TP17,TP18,TP19,TP20,TP21,TP22,TP23,TP24 Test Point HDR_THVT_1x1_100 ANY 28 6 TP1,TP2,TP3,TP14,TP15,TP16 Test Point HDR_THVT_1x1_100 ANY 29 2 U1,U5 SN65HVD257D SOIC_8D TI 30 3 U2,U3,U4 SN74AHC1G08DBV SOT_5DBV TI 31 1 U6 SN74AHC1G86DBV SOT_5DBV TI
SN65HVD255DEVM TEST PROCEDURE Revision: A 2.0 Parameter: Functionality 2.1 Definition: Basic Operation 2.2 Purpose: To verify basic operation of the CAN Transceivers and the preconfigured logic for combining the signals to create a redundant CAN network and fault outputs. 2.3 Sequence: a. Set EVM jumpers and Check Termination Resistances: Set the CAN Bus 1 termination for standard loading of 60 ohms: o Jump JMP6 check resistance between CANH1 (TP4) and CANL1 (TP6) is 120 ohms o Jump JMP4 check resistance between CANH1 (TP4) and CANL1 (TP6) is now 60 ohms o Leave both JMP6 and JMP4 jumped Set the CAN Bus 2 termination for standard loading of 60 ohms: o Jump JMP11 check resistance between CANH2 (TP17) and CANL2 (TP22) is 120 ohms o Jump JMP9 check resistance between CANH2 (TP17) and CANL2 (TP22) is now 60 ohms o Leave both JMP11 and JMP9 jumped Set HVD257 U1 for normal mode: jumper JMP2, S1 to LOW. Set HVD257 U5 for normal mode: jumper JMP8, S1 to LOW. b. Set Up Scope: Use a 4 channel scope with 4 Single-Ended Probes Set Trigger to Ch.1 Rising Edge Set Horizontal Scale to 1 s per division Set Ch.1: Vertical Position = 2.5, Vertical Scale = 5V per division Set Ch.2: Vertical Position = -2.5, Vertical Scale = 1V per division Set Ch.3: Vertical Position = -2.5, Vertical Scale = 1V per division Set Ch.4: Vertical Position = -3.5, Vertical Scale = 5V per division Connect Ch.1 to TXD U1 (TP5) Connect Ch.2 to CANH1 (TP4 or JMP5) Connect Ch.3 to CANL1 (TP9 or JMP5) Connect Ch.4 to RXD1 U1 (TP8) c. Connect power supply to TB1 pins. Program supply to 5V, 250mA. Enable Power Supply. d. Check Power: Observe current and D3 (LED). Current should not be excessive (~32mA). D3 (LED) should be on. e. Connect a signal generator to TXD pin on JMP1. Program generator to 500 khz, 50% Duty Cycle, Vih = 2.5V, Vil = 0V. Enable Signal Generator. 7
SN65HVD255DEVM TEST PROCEDURE Revision: A [NOTE: TXD is not 50Ω terminated; therefore to achieve 5V using the HFS9000, Vih is set 2.5V] f. Observe current and scope display. Current should not be excessive (~32mA). Scope display should look like Figure 2 below. g. Disable Signal Generator and Power Supply h. Use same scope settings but check 2 nd HVD257 CAN bus. Connect Ch.1 to TXD U2 (TP18) Connect Ch.2 to CANH2 (TP17 or JMP10) Connect Ch.3 to CANL2 (TP22 or JMP10) Connect Ch.4 to RXD U2 (TP721) i. Enable Power Supply and function generator. j. Observe current and scope display. Current should not be excessive (~85mA). Scope display should look like Figure 2 below. 8
SN65HVD255DEVM TEST PROCEDURE Revision: A FIGURE 2. Scope Screen Shot k. Use same scope settings but check combining logic of both HVD257 CAN buses. Connect Ch.1 to TXD U2 (TP18) Connect Ch.2 to CANH2 (TP17) Connect Ch.3 to CANL2 (TP22) Connect Ch.4 to RXD (JMP1) l. Observe scope display. Scope display should look like Figure 2 above m. Check for loss of HVD257 1 (U1), same scope settings. Move JMP2 (S1) to High. n. Observe scope display. Scope display should look like Figure 2 above. o. Check Bus 1 transmission is disabled. Connect Ch.2 to CANH1 (TP4 or JMP5) Connect Ch.3 to CANL1 (TP9 or JMP5) p. Observe scope display. Scope display should look like Figure 2 above except CANH and L should be 2.5V steady. q. Check for loss of HVD257 2 (U5), same scope settings. Move JMP2 (S1) to LOW Move JMP8 (S2) to HIGH r. Observe scope display. Scope display should look like Figure 2 above s. Check Bus 2 transmission is disabled. Connect Ch.2 to CANH2 (TP17) Connect Ch.3 to CANL2 (TP22) t. Observe scope display. Scope display should look like Figure 2 above except CANH and L should be 2.5V steady. u. Disable Signal Generator and Power Supply v. Use same scope settings to check fault logic outputs of both HVD257 CAN buses. Set Ch.1: Vertical Position = 2, Vertical Scale = 5V per division Set Ch.2: Vertical Position = 0, Vertical Scale = 5V per division 9
SN65HVD255DEVM TEST PROCEDURE Revision: A Set Ch.3: Vertical Position = -2, Vertical Scale = 5V per division Set Ch.4: Vertical Position = -3, Vertical Scale = 5V per division Connect Ch.1 to RXD (JMP1) Connect Ch.2 to FLT1 (JMP1) Connect Ch.3 to FLT2 (JMP1) Connect Ch.4 to FLT3 (JMP1) Set horizontal scale to 5 s per division w. Check Bus Dominant Faults (FLT1) from CAN1 being shorted Dominant Connect CANH1 to Vcc (TP4 or JMP5) Connect CANL1 to GND (TP9 or JMP5) Move JMP2 (S1) to HIGH Move JMP8 (S2) to LOW x. Set the frequency of the function generator to 50kHz. All other settings stay the same. y. Enable Power Supply and function generator. z. Observe scope display. Scope display should look like Figure 3 (below) FIGURE 3. Scope Screen Shot 10
SN65HVD255DEVM TEST PROCEDURE Revision: A aa. Disable Power Supply and Function Generator bb. Check Bus Dominant Faults (FLT2) from CAN2 being shorted Dominant Connect CANH2 to Vcc (TP17 or JMP10) Connect CANL1 to GND (TP22 or JMP10) Move JMP2 (S1) to LOW Move JMP8 (S2) to HIGH Remove connection from CANH1 to Vcc (TP4 or JMP5) Remove connection from CANL1 to GND (TP9 or JMP5) cc. Enable Power Supply and function generator. dd. Observe scope display. Scope display should look like Figure 4 (below) FIGURE 4. Scope Screen Shot 11
SN65HVD255DEVM TEST PROCEDURE Revision: A ee. Disable Power Supply and Function Generator ff. If all these check out good then the EVM may be considered good. TXD CANH CANL RXD 12
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