2.75kV and 5kV Isolated CAN Transceivers

Transcription

1 EALUATION KIT AAILABLE MAX14878 MAX1488 General Description The MAX14878 MAX1488 family of high-speed transceivers improve communication and safety by integrating galvanic isolation between the CAN protocol controller side of the device and the physical wires of the network (CAN) bus. Isolation improves communication by breaking ground loops and reduces noise where there are large differences in ground potential between ports. The MAX14879 provides up to 275 RMS (6s) of galvanic isolation, while the MAX14878/MAX1488 provide up to 5 RMS (6s) of galvanic isolation. All transceivers operate up to the maximum high-speed CAN data rate of 1Mbps. The MAX14879/MAX1488 feature an integrated standby input (STB) on the isolated side of the transceiver to disable the driver and place the transceiver in a low-power standby mode. The MAX14878 does not include the standby input. The MAX14878 MAX1488 transceivers feature integrated protection for robust communication. The receiver input common-mode range is ±25, exceeding the ISO specification of -2 to +7, and are fault tolerant up to ±54. Driver outputs/receiver inputs are also protected from ±15k electrostatic discharge (ESD) to GNDB on the bus side, as specified by the Human Body Model (HBM). Interfacing with CAN protocol controllers is simplified by the wide 1.71 to 5.5 supply voltage range ( DDA ) on the controller side of the device. This supply voltage sets the interface logic levels between the transceiver and controller. The supply voltage range for the CAN bus side of the device is 4.5 to 5.5 ( DDB ). The MAX14878 MAX1488 are available in a wide-body 16-pin SOIC package with 8mm of creepage and clearance. These devices operate over the -4 C to +125 C temperature range. Benefits and Features Integrated Protection for Robust Communication 2.75k RMS or 5k RMS Withstand Isolation oltage for 6s (Galvanic Isolation) ±25 Receiver Input Common-Mode Range ±54 Fault Protection on Receiver Inputs High-Performance Transceiver Enables Flexible Designs Wide 1.71 to 5.5 Supply for the CAN Controller Interface Two Available 16-pin SOIC Package Pin Configurations Data Rates up to 1Mbps (Max) Dominant Timeout Protection Safety Regulatory Approvals UL According to UL1577 (Basic Insulation) Ordering Information appears at end of data sheet. Applications Industrial Controls HAC Building Automation Switching Gear ; Rev 4; 6/18

2 Simplified Block Diagram DDA DDB DDA DDB MAX14878 ISOLATION BOUNDARY MAX14879 MAX1488 ISOLATION BOUNDARY STB GNDB GNDB Maxim Integrated 2

3 Absolute Maximum Ratings DDA to to +6 DDB to GNDB to +6 to to +6 to to ( DDA +.3) STB to GNDB to +6 I.C. to GNDB to ( DDB +.3) or to GNDB, (Continuous) to +54 Short-Circuit Duration ( to )...Continuous Short-Circuit Duration ( to or DDA )...Continuous Continuous Power Dissipation (T A = +7 C) (16-pin W SOIC (derate 14.1mW/ C above +7 C)) mW Operating Temperature Range...-4 C to 125 C Junction Temperature C Storage Temperature Range C to +15 C Lead Temperature (soldering, 1s)...+3 C Soldering Temperature (reflow) C See Isolation section of the Electrical Characteristics table for maximum voltage from to GNDB Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Information Wide 16-SOIC PACKAGE CODE W16M+9 Outline Number Land Pattern Number 9-17 Thermal Resistance, Four-Layer Board: Junction to Ambient (θ JA ) Junction to Case (θ JC ) 71ºC/W 23ºC/W For the latest package outline information and land patterns (footprints), go to Note that a +, #, or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to Electrical Characteristics ( DDA = 1.71 to 5.5, DDB = 4.5 to 5.5, T A = -4 C to +125 C, STB or I.C. = GNDB. Typical values are at T A = +25 C with = GNDB, DDA = 3.3, DDB = 5. (Notes 1, 2) ) POWER PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Protocol Controller Side (A-Side) oltage Supply CAN Bus Side (B-Side) oltage Supply DDA DDB DDA Supply Current I DDA DDA = DDA = ma DDA = Maxim Integrated 3

4 Electrical Characteristics (continued) ( DDA = 1.71 to 5.5, DDB = 4.5 to 5.5, T A = -4 C to +125 C, STB or I.C. = GNDB. Typical values are at T A = +25 C with = GNDB, DDA = 3.3, DDB = 5. (Notes 1, 2) ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DDB Supply Current DDA Undervoltage Lockout Threshold, Rising DDA Undervoltage-Lockout Threshold, Falling DDB Undervoltage-Lockout Threshold, Rising DDB Undervoltage-Lockout Threshold, Falling, TRANSMITTER I DDB DDB = 5, =, R L = open DDB = 5, =, R L = 6Ω DDB = 5, = DDA, R L = 6Ω DDB = 5, shorted to, = DDA 3.2 DDB = 5, shorted to, = DDB = 5, = DDA, R L = 6Ω, STB = DDB (MAX14879/MAX1488) DDAULO_R 1.66 DDAULO_F DDBULO_R 4.25 DDBULO_F 3.45 Dominant Output oltage O(DOM) =, R L = 5Ω to 65Ω Dominant Differential Bus Output oltage ( - ), =, OD R L = 5Ω to 65Ω, Figure 1 Recessive oltage Output OR = DDA, No load Short-Circuit Current I SHORT = Recessive Differential Bus Output oltage ODR R CM is open R CM = 1.25kΩ, -17 < CM < +17 R CM = 1.25kΩ, -25 < CM < shorted to GNDB shorted to DDB ( - ), = DDA R L is open ( - ), = DDA R L = 6Ω ma ma m Maxim Integrated 4

5 Electrical Characteristics (continued) ( DDA = 1.71 to 5.5, DDB = 4.5 to 5.5, T A = -4 C to +125 C, STB or I.C. = GNDB. Typical values are at T A = +25 C with = GNDB, DDA = 3.3, DDB = 5. (Notes 1, 2) ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS / Output oltage in Standby Mode STB DC BUS RECEIER ( and externally driven) Common Mode Input Range CM MAX14879/MAX1488 only, = DDA, No load, STB = DDB m or to GNDB, output valid Normal operation Standby mode (MAX14879/ MAX1488 only) Differential Input oltage DIFF = DDA Dominant, No Recessive.5 load Differential Input Hysteresis DIFF(HYST) 125 m Standby Mode Differential Input oltage Common-Mode Input Resistance Differential Input Resistance R IN R ID MAX14879/ Recessive.45 MAX1488 only, = DDA, Dominant 1.15 STB = DDB = DDA, R IN = Δ/ I, = +3m, STB = GNDB 1 5 kω (MAX14879/MAX1488) = DDA, R IN = / I, = +3m, STB = GNDB (MAX14879/MAX1488) kω Input Leakage Current I LKG DDB =, = = 5 31 μa Input Capacitance C IN or to GNDB (Note 3) pf Differential Input Capacitance C IND to (Note 3) pf Maxim Integrated 5

6 Electrical Characteristics (continued) ( DDA = 1.71 to 5.5, DDB = 4.5 to 5.5, T A = -4 C to +125 C, STB or I.C. = GNDB. Typical values are at T A = +25 C with = GNDB, DDA = 3.3, DDB = 5. (Notes 1, 2) ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS LOGIC INTERFACE (,, STB) Input High oltage IH 1.71 DDA < DDA 5.5 STB (MAX14879/MAX1488 only).75 x DDA.7 x DDA.7 x DDB Input Low oltage IL, 2.25 DDA 5.5.8, 1.71 DDA < Output High oltage OH, I SOURCE = 4mA STB (MAX14879/MAX1488 only).8 DDA -.4 Output Low oltage OL, I SINK = 4mA.4 Input Pullup Current I PU μa Input Pulldown Resistance R PD STB (MAX14879/MAX1488 only) kω Input Capacitance 5 pf PROTECTION Fault Protection Range to GNDB, to GNDB ESD Protection ( and to GNDB) ESD Protection ( and to ) ESD Protection (All Other Pins) Thermal Shutdown Threshold Thermal Shutdown Hysteresis IEC Air-Gap Discharge ±1 IEC Contact Discharge ±5 Human Body Model ±15 IEC Contact Discharge ±3 IEC Air Gap Discharge. 33pF capacitor connected between and GNDB Human body model ±2 k Temperature rising +16 C ±1 k k 13 C Maxim Integrated 6

7 Electrical Characteristics - Switching ( DDA = 1.71 to 5.5, DDB = 4.5 to 5.5, T A = -4 C to +125 C, STB or I.C. = GNDB. Typical values are at T A = +25 C with = GNDB, DDA = 3.3, DDB = 5, STB = GNDB.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Differential Driver Output Rise Time Differential Driver Output Fall Time t R t F R L = 6Ω, C L = 1pF, R CM is open, Figure 1 R L = 6Ω, C L = 1pF, R CM is open, Figure 1 to Loop Delay t LOOP 15pF, Dominant to recessive and R L = 6Ω, C L = 1pF, C = recessive to dominant. Figure 2 Propagation Delay Propagation Delay t PD_RD t PD_DR t PD_RD t PD_DR R L = 6Ω, C L = 1pF, R CM open, Figure 1 C L = 15pF, Figure 3 Recessive to Dominant Dominant to Recessive Recessive to Dominant Dominant to Recessive 2 ns 33 ns 21 ns Dominant Timeout t DOM (Note 4) ms Undervoltage Detection Time to Normal Operation Wake-up Time to Dominant State Standby Propagation Delay Standby to Normal Mode Delay Normal to Standby Dominant Mode Delay t U(DDA), t U(DDB) μs t WAKE MAX14879/MAX1488 only, In standby mode ( STB = DDB ), Figure 4 MAX14879/MAX1488 only,, Dominant to recessive, STB = DDB, C L = 15pF ns ns.5 5 μs ns t EN MAX14879/MAX1488 only 4 μs MAX14879/MAX1488 only, ( - ) > μs Maxim Integrated 7

8 Electrical Characteristics Package Insulation and Safety Related Specifications: W 16-SOIC ( DDA = 1.71 to 5.5, DDB = 4.5 to 5.5, T A = -4 C to +125 C, STB or I.C. = GNDB. Typical values are at T A = +25 C with = GNDB, DDA = 3.3, DDB = 5, STB = GNDB.) PARAMETER SYMBOL CONDITIONS ALUE UNITS Insulation Resistance RIO T A = +15 C, IO = 5 > 1 12 Ω Barrier Capacitance C IO to GNDB 2 pf Minimum Creepage Distance Minimum Clearance Distance CPG 8 mm CLR 8 mm Internal Clearance Distance through insulation.15 mm Comparative Tracking Index CTI 55 Electrical Characteristics Insulation Characteristics (As Defined by DE 884-1): W 16-SOIC ( DDA = 1.71 to 5.5, DDB = 4.5 to 5.5, T A = -4 C to +125 C, STB or I.C. = GNDB. Typical values are at T A = +25 C with = GNDB, DDA = 3.3, DDB = 5, STB = GNDB. PARAMETER SYMBOL CONDITIONS ALUE UNITS Partial Discharge PR Method B1 = IORM x (t = 1s, partial discharge < 5pC) Maximum Repetitive Peak oltage Maximum Working oltage Maximum Transient Overvoltage MAX MAX14878/ MAX1488 Note 1: All devices 1% production tested at T A = +25 C. Specifications over temperature are guaranteed by design. Note 2: All currents into the device are positive. All currents out of the device are negative. All voltages referenced to their respective ground ( or GNDB), unless otherwise noted. Note 3: Not production tested. Guaranteed at T A = +25 C. Note 4: The dominant timeout feature releases the bus when TX is held low longer than t DO. CAN protocol guarantees a maximum of 11 successive dominant bits in any transmission. The minimum data rate allowed by the dominant timeout, then, is 11/ t DO (min). 225 MAX IORM MAX14878/MAX IOWM to GNDB continuous MAX MAX14878/ MAX1488 MAX IOTM MAX14878/MAX Isolation oltage SIO to GNDB for 6s Maximum Surge Isolation oltage 848 MAX MAX14878/ MAX P P RMS P k RMS IOSM IEC , Basic insulation 1 k Barrier Resistance RS T A = +15 C, IO = 5 >1 9 Ω Climate Category 4/125/21 Pollution Degree DIN DE 11, Table Maxim Integrated 8

9 RCM + RL CL OD - CM RCM GNDB trise/fall< 3ns for DDA 5% 5% tpd_rd tpd_dr OD.9.5 Figure 1. Transmitter Test Circuit and Timing Diagram + I - RL CLD trise/f AL L< 3ns for 5% tloop2 D DA CL tloop1 5% D DA tloop = tloop1 ~ tloop2 Figure 2. to Loop Delay O + - C L (-) RISE/FALL TIME < 3ns GDNB + I ID ID t PD_RD t PD_DR DDA 5% 5% Figure 3: Receiver Timing Diagram DDB STB RL CLD - DIFF CL twake Figure 4: MAX14879/MAX1488 STB to Delay Maxim Integrated 9

10 Typical Operating Characteristics DDA = 3.3, DDB = 5, 6Ω load between and, T A = +25 C, unless otherwise noted. I DD (ma) DDA SUPPLY CURRENT vs. TEMPERATURE = HIGH = LOW, 6Ω LOAD TEMPERATURE ( C) = LOW, NO LOAD toc1 I DD (ma) DDB SUPPLY CURRENT vs. TEMPERATURE = LOW, 6Ω LOAD = HIGH TEMPERATURE ( C) = LOW, NO LOAD toc2 MEAN SUPPLY CURRENT (ma) DDA SUPPLY CURRENT vs. DATA RATE switching at 5% NO LOAD DATA RATE (kbps) R L = 6Ω toc3 MEAN SUPPLY CURRENT (ma) DDB SUPPLY CURRENT vs. DATA RATE SWITCHING AT 5% NO LOAD DATA RATE (kbps) R L = 6Ω toc4 CAN_ OUTPUT OLTAGE () / OUTPUT OLTAGE vs. TEMPERATURE = LOW 6Ω BETWEEN AND TEMPERATURE (ºC) toc5 SOURCE CURRENT (ma) OUTPUT SHORT-CIRCUIT CURRENT vs. OLTAGE toc6 = LOW OLTAGE () Maxim Integrated 1

11 Typical Operating Characteristics (continued) DDA = 3.3, DDB = 5, 6Ω load between and, T A = +25 C, unless otherwise noted. SINK CURRENT (ma) OUTPUT SHORT-CIRCUIT CURRENT vs. OLTAGE = LOW OLTAGE () toc7 PROPAGATION DELAY (ns) PROPAGATION DELAY vs. TEMPERATURE t PD_RD TEMPERATURE (ºC) t PD_DR toc8 PROPAGATION DELAY (ns) PROPAGATION DELAY vs. TEMPERATURE STB = GND t PD_RD TEMPERATURE ( C) t PD_DR toc9 WAKE-UP TIME (µs) WAKE-UP TIME TO DOMINANT STATE vs. TEMPERATURE STB = DDB TEMPERATURE ( C) toc1 DIFFERENTIAL OLTAGE () (-) DIFFERENTIAL OUTPUT OLTAGE vs. LOAD DIFFERENTIAL LOAD RESISTANCE (Ω ) toc11 RECEIER HYSTERESIS (m) RECEIER INPUT HYSTERESIS vs. TEMPERATURE TEMPERATURE ( C) toc12 Maxim Integrated 11

12 Pin Configuration TOP IEW TOP IEW DDA 1 16 DDB DDA 1 16 DDB 2 3 MAX GNDB I.C. 2 3 MAX14879 MAX GNDB STB N.C N.C N.C I.C. N.C I.C. N.C. 7 1 I.C. N.C. 7 1 I.C. 8 9 GNDB 8 9 GNDB W SOIC W SOIC Pin Description MAX14878 PIN MAX14879, MAX1488 CONTROLLER SIDE (A-SIDE) NAME FUNCTION REF SUPPLY TYPE 1 1 DDA Power Supply Input for the Controller Side/A-Side. Bypass DDA to with.1μf capacitor as close to the device as possible. DDA Power 2, 8 2, 8 Controller Side/A-Side Ground DDA Ground 3 5 4, 5, 7 4, 6, 7 N.C. 6 3 CAN BUS SIDE (B-SIDE) Receiver Output. is high when the bus is in the recessive state. is low when the bus is in the dominant state. No Connection. Not internally connected. Connect to, DDA, or leave unconnected. Transmit Data Input. and are in the dominant state when is low. and are in the recessive state when is high. DDA DDA Digital Output 9, 15 9, 15 GNDB CAN Bus Side/B-Side Ground DDB Ground 1, 14 1 I.C. Internally Connected. Connect to GNDB or leave unconnected I.C Internally Connected. Connect to GNDB, DDB, or leave unconnected Low-Level CAN Differential Bus Line DDB Differential I/O High-Level CAN Differential Bus Line DDB Differential I/O 14 STB Standby Input, Active High. Drive STB high to disable the CAN bus driver and place the transceiver in low-power standby mode. Drive STB low for normal operation DDB Power Supply Input for the CAN Bus Side/B-Side. Bypass DDB to GNDB with a.1μf capacitor as close to the device as possible. DDB DDB Digital Input Digital Input Power Maxim Integrated 12

13 Detailed Description The MAX14878 MAX1488 isolated controller area network (CAN) transceivers provide 275 RMS or 5 RMS (6s) of galvanic isolation between the cable side (B-side) of the transceiver and the controller side (A-side). These devices allow up to 1Mbps communication across an isolation barrier when a large potential exists between grounds on each side of the barrier. and outputs are short-circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs in a high-impedance state. Isolation Data isolation is achieved using integrated capacitive isolation that allows data transmission between the controller side and cable side of the transceiver. Fault Protection The MAX14878 MAX1488 feature ±54 fault protection on the and bus lines. When or is pulled above +3 (typ) or below -3 (typ), the I/O is set to high impedance. This wide fault protection range simplifies selecting external TS components for surge protection. Transmitter The transmitter converts a single-ended input signal () from the CAN controller to differential outputs for the bus lines (, ). The truth table for the transmitter and receiver is given in Table 1. Transmitter Dominant Timeout The MAX14878 MAX1488 feature a transmitter-dominant timeout (t DOM ) that prevents erroneous CAN controllers from clamping the bus to a dominant level by maintaining a continuous low signal. When remains in the dominant state (low) for greater than t DOM, the transmitter is disabled, releasing the bus to a recessive state (Table 1. After a dominant timeout fault, normal transmitter function is re-enabled on the rising edge of a. The transmitter-dominant timeout limits the minimum possible data rate to 9kbps for standard CAN protocol. Driver Output Protection The MAX14878 MAX1488 feature integrated circuitry to protect the transmitter output stage against a short-circuit to a positive or negative voltage by limiting the driver current. The transmitter returns to normal operation once the short is removed. Thermal shutdown further protects the transceiver from excessive temperatures that may result from a short by setting the transmitter outputs to high impedance when the junction temperature exceeds +16 C (typ). The transmitter returns to normal operation when the junction temperature falls below the thermal shutdown hysteresis. Receiver The receiver reads the differential input from the bus (, ) and transfers this data as a single-ended output () to the CAN controller. During normal operation, a comparator senses the difference between and, DIFF = ( - ), with respect to an internal threshold of.7 (typ). If DIFF >.9, a logiclow is present on. If DIFF <.5, a logic-high is present. The and common-mode range is ±25. is logic-high when and are shorted or terminated and undriven. Thermal Shutdown If the junction temperature exceeds +16 C (typ), the device is switched off. During thermal shutdown, and are high-impedance and all IC functions are disabled. The transmitter outputs are re-enabled and the device resumes normal operation when the junction temperature drops below 147 C (typ). Table 1. Transmitter and Receiver Truth Table When Not Connected to the Bus LOW TIME BUS STATE LOW < t DOM HIGH LOW DOMINANT LOW LOW > t DOM DDB /2 DDB /2 RECESSIE HIGH HIGH X DDB /2 DDB /2 RECESSIE HIGH Maxim Integrated 13

14 Applications Information Reduced EMI and Reflections In multidrop CAN applications, it is important to maintain a single linear bus of uniform impedance that is properly terminated at each end. A star configuration should never be used. Any deviation from the end-to-end wiring scheme creates a stub. High-speed data edges on a stub can create reflections back down the bus. These reflections can cause data errors by eroding the noise margin of the system. Although stubs are unavoidable in a multidrop system, care should be taken to keep these stubs as short as possible, especially when operating with high data rates. Typical Operating Circuit 3.3 5_ISO 5_ISO 3.3 ISOLATION BOUNDARY MAX MAX14878 ISOLATION BOUNDARY _ISO ISOLATION BOUNDARY MAX Ordering Information PARTNUMBER ISOLATION OLTAGE STANDBY OPERATING TEMPERATURE PACKAGE MAX14878AWE+ 5k RMS NO -4 C to +125 C W 16-SOIC MAX14878AWE+T 5k RMS NO -4 C to +125 C W 16-SOIC MAX14879AWE+ 2.75k RMS YES -4 C to +125 C W 16-SOIC MAX14879AWE+T 2.75k RMS YES -4 C to +125 C W 16-SOIC MAX1488AWE+ 5k RMS YES -4 C to +125 C W 16-SOIC MAX1488AWE+T 5k RMS YES -4 C to +125 C W 16-SOIC Maxim Integrated 14

15 Revision History REISION NUMBER REISION DATE DESCRIPTION PAGES CHANGED 6/17 Initial release 1 8/17 Updated parameters in Electrical Characteristics table and added Typical Operating Circuit 7, /17 Corrected pin descriptions for internally connected pins. Updated Figure 2 9, /18 Updated Safety Regulatory Approvals section 1 4 6/18 Updated Pin Description table 12 For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim Integrated s website at Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. 218 Maxim Integrated Products, Inc. 15