MAXIM MAX13020/MAX13021 Manual
Contents
1. 20us div Ri 660kQ C 6 8nF LOW SCOPE MODE 10 4kbps SLOPE MODE 13020 toc13 60V Fault Protected LIN Transceivers Typical Operating Characteristics continued VBAT 12V and TA 25 C unless otherwise noted LIN TRANSMITTING NORMAL SLOPE MODE MAX13020 toc11 LIN TRANSMITTING LOW SLOPE MODE 13020 toc12 TX TX 5V div 5V div LIN LIN 5V div 5V div RX RX 5V div 5V div 10us div 20us div Ry 500kQ RL 1kQ Cy 10nF C inF NORMAL SCOPE MODE LOW SCOPE MODE 20kbps 10 4kbps LIN TRANSMITTING LOW SLOPE MODE MAX13020 toc14 TX 5V div LIN 5V div RX 5V div TX 5V div LIN 5V div RX 5V div 20us div 500kQ C 10nF LOW SCOPE MODE 10 4kbps MAXIM 60V Fault Protected LIN Transceivers Pin Description FUNCTION a wake up event from sleep mode Data Receive Output Open Drain RXD is logic low when the LIN bus is dominant RXD is active low after Sleep Input Drive NSLP logic high or logic low to control the operating mode See Table 1 and Figures 1 2 normal low slope mode Local Wake Up Input Present a falling edge on NWAKE to generate a local wake up event Connect NWAKE to BAT with a 5kQ resistor if local wake up is not required Data Transmit Input CMOS Compatible Drive TXD logic low to force the LIN bus to a dominant state in Ground modes LIN Bus I O LIN is terminated with an internal 30kQ resistor in norma2. Fault mode disable mode MAX13021 GND t mode disable mode MAX13021 LIN Pullup Current Slave Termination Resistance to VBAT RSLAVE mode Vi IN GND VNsiL P GND Standby normal low slope modes VI IN GND VpBAT 12V Short Circuit Output Current VLIN VBAT 12V VrTxp GND t lt tpoM 12V VBAT 27V VTXD GND t lt tpoM Note 1 VBAT 12V 60V Vrxp GND t lt IDOM Receiver Dominant State Vth DOM VBAT V to 38V Receiver Recessive State Receiver Threshold Center Voltage Vth REC Vth CENTER VBAT V to 438V VBAT V to 438V 0 6 x VBAT 0 475 x VBAT 0 5 VBAT 0 525 x VBAT Receiver Threshold Hysteresis Voltage Thermal Shutdown Threshold Vth HYS VBAT V to 38V 0 145 x VBAT 0 16 x VBAT 0 175 x VBAT Thermal Shutdown Hysteresis ESD PROTECTION Human Body Model LIN Contact Discharge IEC61000 4 2 LIN NWAKE BAT tested to IBEE test setup C1 100nF on VBAT C2 220pF on LIN R 33kQ NWAKE MAXIA 60V Fault Protected LIN Transceivers TIMING CHARACTERISTICS VBAT 5V to 38V TA 40 C to 125 C unless otherwise noted Typical values are at VBAT 12V and TA 25 C Positive currents flow into the device PARAMETER SYMBOL CONDITIONS VBAT V to 18V Vth REC MAX LIN Du
3. VBAT 38V VLIN VBAT Standby mode bus recessive VBAT 5V to 27V VLIN VINH VNWAKE VBAT VTXD VNSLP GND Standby mode bus dominant VBAT 12V VINH VNWAKE VBAT VLIN VTxD VNSLP GND z ormal low slope mode us recessive VBAT 5V to 27V LIN VINH VNWAKE VBAT TXD VNSLP 5V ormal low slope mode us dominant no load BAT VINH VNWAKE 12V TxD GND VNSsLP 5V p mode bus dominant T VNWAKE 12V VTxD VNSLP GND mode bus dominant MAX13021 VNWAKE VBAT GND VNSLP 5V ble mode bus dominant MAX13021 T VINH VNWAKE 12V VLIN GND BAT Supply Current lt lt lt lt TI lt lt gt 2 AVLAXL VI 60V Fault Protected LIN Transceivers ELECTRICAL CHARACTERISTICS continued VBAT 5V to 38V TA 409 to 125 C unless otherwise noted Typical values are at VBAT 12V and TA 25 C Positive currents flow into the device PARAMETER SYMBOL CONDITIONS TRANSMITTER DATA INPUT TXD High Level Input Voltage Output recessive Low Level Input Voltage Output dominant Pulldown Resistance Low Level Input Current GND Standby mode VNWAKE GND Low Level Output Current VLIN VBAT VTxD 0 4V local wake up request RECEIVER DATA OUTPUT RXD Low Level Output Current VLIN GND VRxp 0 4V Normal low s
4. addi MAALM Battery Voltage Input Bypass BAT to ground with a 0 1uF ceramic capacitor as close to the device as Inhibit Output INH is active high in standby and normal low slope modes See Table 1 t NSLP 1 AFTER 0 TO 1 gt GOTONORM TXD 1 STANDBY MODE NORMAL SLOPE MODE t NSLP 1 AFTER 0 TO 1 sP a 1 gt lGOTONORM TXD 1 TXD 0 twake AFTER 1 TO 0 gt tNwAkE OR l NSLP 0 AFTER 1 TO 0 t LIN 0 AFTER 1 TO 0 21805 gt laoTOSLEEP l NSLP 0 AFTER 1 TO 0 gt GOTOSLEEP LOW SLOPE MODE WNSLP 1 AFTER 0 TO 1 gt GOTONORM TXD 0 INITIAL POWER ON STATE Figure 1 MAX13020 Operating Modes tional slew rate limiting to further reduce EME The transmitting operating mode is selected by the logic state of NSLP and TXD Table 1 To enter normal slope mode or low slope mode drive TXD logic high or logic low then drive NSLP logic high for longer than tGOTONORM The MAX13021 features two additional operating modes to reduce current consumption during LIN bus shorts to GND On initial power up the device enters sleep mode LCOE NKXVW OCOE LXVMW MAX13020 MAX13021 60V Fault Protected LIN Transceivers TNWAKE 0 AFTER 1 TO 0 gt tNWAKE NSLP 0 AFTER 1 TO 0 gt GOTOSLEEP NSLP 1 AFTER 00 1 gt GOTONORM DISABLE MODE LIN DOMINANT gt lLIN DOM DET NSLP 1 AFTERO TO 1 gt lGOTONORM 0 0 LOW SLOPE MODE LIN RECESSIVE gt lL
5. mode from normal slope mode AVLAZXL VI 60V Fault Protected LIN Transceivers Low Slope Mode Low slope mode is identical to normal slope mode with the exception of the LIN transmitter In low slope mode the transmitter slew rate is further limited for improved EME performance Maximum data rate is limited to 10 4kbaud due to the increased slew rate limiting of the LIN transmitter From standby or sleep mode drive TXD logic low then drive NSLP logic high for longer than tGOTONORM lo enter low slope mode Drive NSLP logic low for longer than tGOTOSLEEP to force the device into sleep mode from low slope mode LIN Bus Dominant Management MAX13021 The MAX13021 provides two additional states to imple ment reduced current consumption during a LIN to GND short condition When the MAX13021 detects a dominant clamped fault on LIN the device disables the transmitter and enters a low power fail safe mode The receiver is disabled and a low power comparator is enabled to monitor the LIN bus When a recessive state is detected on LIN the device exits fault mode and returns to standby mode Fault Mode MAX13021 The device enters fault mode from normal slope or low slope mode when a dominant state is detected on LIN for longer than tLIN DOM DET In fault mode the slave Table 1 Operating Modes 330kQ 330 or strong pulldown NORMAL termination resistor from LIN to BAT is disconnected and the LIN transmitter and r
6. 19 0559 Rev 1 6 06 MA AKISI 60V Fault Protected LIN Transceivers General Description Features The MAX13020 MAX13021 60V fault protected low MAX13020 is a Pin to Pin Upgrade for TJA1020 power local interconnect network LIN transceivers are ESD Protection ideal for use in automotive network applications where 12kV Human Body Model LIN high reliability is required The devices provide the 4kV Contact Discharge LIN NWAKE BAT interface between the LIN master slave protocol con LIN 2 0 SAE J2602 Compatible troller and the physical bus described in the LIN 2 0 e specification package and SAE J2602 specification The devices are intended for in vehicle subnetworks with a single master and multiple slaves Robust Electromagnetic Immunity EMI The extended fault protected voltage range of x60V on PASSIVE Behavior M Unpowsred State the LIN bus line allows for use in 12V 24V and TXD Dominant Timeout Function Slew Rate Limited Transmitter for Low Electromagnetic Emissions EME 42V automotive applications The devices allow com LIN Bus Dominant Management MAX13021 Only munication up to 20kbaud and include slew rate limit Input Levels Compatible with 3 3V and 5V ed transmitters for enhanced electromagnetic Controllers emissions EME performance The devices feature a Integrated 30kC Termination Resistor for Slave low power 4 sleep mode and provide wake up Applications OOS a Low S
7. 2V and TA 25 C unless otherwise noted SINK CURRENT vs TXD PULLDOWN INH ON RESISTANCE Igat FAULT CURRENT OUTPUT VOLTAGE vs TEMPERATURE vs TEMPERATURE 5 5 2 100 E STANDBY MODE 15mA E SLEEP MODE 2 AFTER A LOCAL 45 8 90 Vun 0V 4 __1 2 40 3 9 12V nm LI z 3 BEY amp 6 lt U D 5 5 u 25 438V z 20 2 40 x 15 E 30 10 20 5 10 0 2 3 4 5 40 25 10 5 20 35 50 65 80 95 110 125 40 25 10 5 20 35 50 65 80 95 110 125 OUTPUT LOW VOLTAGE V TEMPERATURE C TEMPERATURE C LIN TRANSMITTING NORMAL LIN OUTPUT SPECTRUM LIN OUTPUT SPECTRUM SLOPE MODE MAX13020 10607 MAX13020 10 08 13020 toc09 ppp WEE E I c PETERE VS 5V div TX Ar S x o4 5V div LIN 5V div FFT H 5 FFT RX 20dB div 20dB div 5V div 10us div 20us div 20us div 2 5MHz div 2 5MHz div R 1k RL 6600 RL 6600 C 1nF 6 8nF CL 6 8nF NORMAL SCOPE MODE NORMAL SCOPE MODE LOW SCOPE MODE 20kbps 20kbps 10 4kbps MAXKLAVI 7 LCOE NXVW OCOE LXV MAX13020 MAX13021 LIN TRANSMITTING NORMAL SLOPE MODE 13020 toc10 TX 5V div LIN 5V div RX 5V div 10us div Ri 660kQ 6 8nF NORMAL SCOPE MODE 20kbps LIN TRANSMITTING LOW
8. ER 001 gt IGOTONORM TXD 1 NSLP 1 AFTER 0 TO 1 gt lGOTONORM TXD 1 WNSLP 0 AFTER 1 TO 0 gt lGOTOSLEEP wake 0 AFTER 1 TO 0 gt tnwake OR STANDBY LIN 0 AFTER 1 TO 0 gt BUS bs NSLP 0 AFTER 1 TO 0 gt lGOTOSLEEP WNSLP 1 AFTER 0 TO 1 gt lGOTONORM TXD 0 INITIAL POWER ON STATE mode In standby mode RXD is driven logic low to transmit the wake up interrupt flag to a microcontroller The wake up source flag is presented on TXD as a strong pulldown in the case of a local wake up In the case of a remote wake up TXD is pulled low by the internal 330kQ resistor only The wake up interrupt and wake up source flag are cleared when the MAX13020 MAX13021 transition to normal slope mode or low slope mode Normal Slope Mode In normal slope mode the MAX13020 MAX13021 pro vide the physical layer interface to a LIN bus through RXD and TXD INH is pulled high and the internal slave termination resistance from LIN to BAT is enabled Data presented on TXD is transmitted on the LIN bus with a controlled slew rate to limit EME Drive TXD logic low to assert a dominant state on LIN The LIN bus state is presented on the open drain output RXD A dominant LIN state produces a logic low on RXD From standby or sleep mode drive TXD logic high then drive NSLP logic high for longer than tGOTONORM to enter normal slope mode Drive NSLP logic low for longer than tGOTOSLEEP to force the device into sleep
9. IN DOM REC Figure 2 MAX13021 Operating Modes Sleep Mode Sleep mode is the lowest power operating mode and is the default state after power is applied to BAT In sleep mode the MAX13020 MAX13021 disable the LIN trans mitter and receiver to reduce power consumption RXD and INH are high impedance The internal slave termi nation resistor between LIN and BAT is disabled and only a weak pullup from LIN to BAT is enabled While in sleep mode the MAX13020 MAX13021 transition to standby mode when a local or remote wake up event is detected For applications with a continuously powered microprocessor drive NSLP logic high for longer than tGOTONORM to force the MAX13020 MAX13021 directly into normal slope mode if TXD is logic high and low slope mode if TXD is logic low From normal slope or low slope mode drive NSLP logic low for longer than tGOTOSLEEP to force the MAX13020 MAX13021 into sleep mode Standby Mode In standby mode the LIN transmitter and receiver are disabled the internal slave termination resistor between LIN and BAT is enabled and the INH output is pulled high The MAX13020 MAX13021 transition to standby mode from sleep mode when a wake up event is detected From standby mode drive TXD logic high or logic low then drive NSLP logic high for longer than tGOTONORM to transition to normal slope or low slope 10 gt LIN DOM REC LIN DOMINANT 200000 NORMAL SLOPE MODE MLIN RECESSIVE 1 AFT
10. ND unless otherwise noted INE gu oaa Aaa k edet cua oH Ma o 0 3V to 0 3V Positive currents flow into the device u e etes 50mA to 15mA EE E 0 3V to 40V Continuous Power Dissipation 0 3V V 8 Pin SO derate 5 9mW C above 70 O 471mW to 60V Continuous Operating Temperature Range 40 C to 125 C 80V Continuous Storage Temperature Range 659 to 150 C 0 3V to 80V Junction Temperature 150 NWAKE Current NWAKE lt 0 3V 15mA Lead Temperature Soldering 10s 300 C 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 ELECTRICAL CHARACTERISTICS VBAT 5V to 381 TA 40 C to 125 C unless otherwise noted Typical values at VBaT 12V and TA 25 C Positive currents flow into the device PARAMETER SYMBOL CONDITIONS MAX BAT Supply Voltage VBAT Operating range VBAT 27V Sleep mode VLIN VBAT VNWAKE VBAT Vrxp GND
11. a Maxim product No circuit patent licenses are implied Maxim reserves the right to change the circuitry and specifications without notice at any time Maxim Integrated Products 120 San Gabriel Drive Sunnyvale CA 94086 408 737 7600 15 2006 Maxim Integrated Products MAXIM is registered trademark of Maxim Integrated Products Inc LCOE NXVW OCOE LXVMI
12. eceiver are disabled to reduce power consumption INH output remains pulled high A low power comparator is enabled to monitor the LIN bus Fault mode is cleared and the MAX13021 enters standby mode when a recessive state is detect ed on LIN for longer than tLIN DOM REC Disable Mode MAX13021 The MAX13021 enters disable mode from fault mode after NSLP is driven logic low for longer than tGOTOSLEEP The INH output is high impedance in dis able mode to reduce current consumption The LIN transmitter and receiver are disabled and the slave ter mination resistor from LIN to BAT is disconnected A low power comparator is enabled to monitor the LIN bus The 13021 enters fault mode when NSLP is driven logic high for longer than tGOTONORM The device enters sleep mode if a recessive state is detect ed on LIN for longer than tL IN DOMY REC Local and Remote Wake Up Events The MAX13020 MAX13021 recognize local and remote wake up events from sleep mode The MAX13021 also recognizes local wake up events from disable mode A local wake up event is detected when NWAKE is held at logic low for longer than tGOTONORM after a falling edge NWAKE is internally pulled up to BAT with a TRANSMITTER RECEIVER COMMENTS High Z High Z Disabled Disabled No wake up events detected ES Disabled Wake up detected from sleep mode TXD indicates wake up source Note 1 Disabled SLOPE TXD IN L H 1 1 Normal slope Enabled No
13. g is presented on TXD as a strong pulldown in the case of a local wake up In the case of a remote wake up TXD is pulled low by the internal resistor only To read the wake up source flag pull TXD high with an external pullup resistor see Reading the Wake Up Source Flag section The wake up interrupt and wake up source flag are cleared when the MAX13020 MAX13021 transition to normal slope mode or low slope mode The thermal shut down circuit forces the driver outputs into high imped ance state if the die temperature exceeds 160 Normal operation resumes when the die temperature cools to 140 C Fail Safe Features The MAX13020 MAX13021 include a number of fail safe features to handle fault conditions Internal pull downs are provided on control inputs TXD and NSLP to force the device into a known state in the event that these inputs are disconnected LIN Short Circuit Protection The LIN transmitter is current limited to prevent dam age from LIN to BAT shorts TXD Dominant Timeout If TXD is shorted to GND or is otherwise held low the resulting dominant LIN state blocks traffic on the LIN bus In normal slope and low slope modes the LIN transmitter is disabled if TXD is held at logic low for longer than tTXD DOM DIS The transmitter is re enabled on the next rising edge on TXD Loss of Power If BAT or GND are disconnected interrupting power to the MAX13020 MAX13021 LIN remains high imped ance to avoid load
14. ing the LIN bus Aaditionally RXD is high impedance when BAT is disconnected preventing current flow from a connected microcontroller 12 LIN RECESSIVE 0 6 x VBAT Vin 04x Vgar N DOMINANT ODE STANDBY MODE Figure 3 Remote Wake Up Timing LIN Bus Dominant Management MAX13021 The MAX13021 provides LIN bus dominant manage ment protection to reduce current consumption during a LIN to GND short condition When the LIN to GND short is cleared and a recessive LIN state is detected the MAX13021 returns to standby or sleep mode ESD Protection As with all Maxim devices ESD protection structures are incorporated on all pins to protect against ESDs encountered during handling and assembly The LIN NWAKE and BAT pins are protected up to 4kV as measured by the IEC61000 4 4 Contact Discharge Model LIN is protected to 12kV Human Body Model Protection structures prevent damage caused by ESD events in all operating modes and when the device is unpowered ESD Test Conditions ESD performance depends on a variety of conditions Contact Maxim for a reliability report documenting test setup methodology and results Applications Information Master LIN Nodes Configure the MAX13020 MAX13021 as a master LIN node by connecting a 1kQ resistor from LIN to INH with a blocking diode see the Typical Operating Circuit INH is held at a logic high level in normal slope low slope standby and fault MAX13021
15. l slope low slope and standby possible Detailed Description The MAX13020 MAX13021 60V fault protected low power local interconnect network LIN transceivers are ideal for use in automotive network applications where high reliability is required The devices provide the interface between the LIN master slave protocol con troller and the physical bus described in the LIN 2 0 specification package and SAE J2602 specification The devices are intended for in vehicle subnetworks with a single master and multiple slaves The extended fault protected voltage range of 60V on the LIN bus line allows for use in 12V 24V and 42V automotive applications The devices allow com munication up to 20kbaud and include slew rate limit ed transmitters for enhanced electromagnetic emissions EME performance The devices feature a low power 4 sleep mode and provide wake up source detection The MAX13020 is a pin to pin replacement and is func tionally compatible with the Philips TJA1020 The MAX13021 includes enhanced bus dominant clamping fault management for reduced quiescent current during LIN bus shorts to GND Operating Modes The MAX13020 MAX13021 provide two different trans mitting modes an intermediate standby mode and a low power sleep mode Normal slope mode allows full speed communication at 20kbaud with a slew limited transmitter to reduce EME Low slope mode permits communication up to 10 4kbaud and provides
16. leep Mode with Local and Remote The MAX13020 is a pin to pin replacement and is func Wake Up Detection tionally compatible with the Philips TJA1020 The y iri MAX13021 includes enhanced bus dominant clamping 7 Wake Up Source Recognition fault management for reduced quiescent current during Thermal Shutdown LIN bus shorts to GND The MAX13020 MAX13021 are available in the 8 pin SO package and operate over Ordering Information the 40 C to 125 C automotive temperature range LIN BUS Dominant PACKAGE Applications MANAGEMENT PACKAGE CODE 12V 42V Automotive MAX13020ASA 8 SO S8 5 24V Heavy Truck and Bus MAX13021ASA Yes 850 58 5 Note All devices are specified over the 40 C to 125 C auto motive temperature range Denotes lead free package Typical Operating Circuit MAXIM MAX5023 BAT NWAKE MAXIM MAX13020 13021 MASTER NODE ONLY MICROCONTROLLER OPTIONAL TXD PULLUP RESISTOR FOR READING WAKE UP SOURCE FLAG Pin Configuration appears at end of data sheet MAXIM Maxim Integrated Products 1 For pricing delivery and ordering information please contact Maxim Dallas Direct at 1 888 629 4642 or visit Maxim s website at www maxim ic com LCOELXVW OCOE LXVIW MAX13020 MAX13021 60V Fault Protected LIN Transceivers ABSOLUTE MAXIMUM RATINGS All voltages referenced to G
17. lope mode VLIN VBAT VRXD 5V High Level Leakage Current NSLP INPUT High Level Input Voltage Low Level Input Voltage Pulldown Resistance VNSLP 5V Low Level Input Current VNsLP GND NWAKE INPUT igh Level Input Voltage VBAT 1 0 Low Level Input Voltage WAKE Pullup Current WAKE GND igh Level Leakage Current WAKE 38V VBAT 38V INH OUTPUT Switch On Resistance Between normal low slope modes liNH BAT and INH 5mA VBAT 12V eep mode High Level Leakage Current WAKE 38V VBAT 38V LIN BUS I O LIN Recessive Output Voltage VO RECES TXD 5V ILIN 1 ormal low slope mode LIN Dominant Output Voltage VO DOM GND Vpar V to 27V TERM 5000 to BAT MAKINI 3 LZOELXVNW OZOE LXVMI MAX13020 MAX13021 60V Fault Protected LIN Transceivers ELECTRICAL CHARACTERISTICS continued VBAT 5V to 38V Ta 40 C to 125 C unless otherwise noted Typical values are at VBAT 12V and Ta 25 C Positive currents flow into the device PARAMETER High Level Leakage Current SYMBOL CONDITIONS VLIN VBAT VTXD 5V Device Leakage Current VBAT Disconnected Device Leakage Current GND Disconnected IL GND VBAT GND 18V VBAT GND 18V LIN Current After Short Detection Short Circuit Recovery Threshold Voltage lIL FAULT Vth RECOVERY
18. m THERMAL SHUTDOWN WAKE UP TIMER CONTROL SLEEP NORMAL TIMER RATE CONTROL MAXIMA MAX13020 MAX13021 14 FILTER VBAT 2 PROCESS BiCMOS Chip Information AVLAZXL VI 60V Fault Protected LIN Transceivers Package Information The package drawing s in this data sheet may not reflect the most current specifications For the latest package outline information go to www maxim ic com packages INCHES MILLIMETERS MAX MIN 0 069 1 35 0 010 0 10 SOICN EPS 0 019 0 35 0 010 0 19 0 050 BSC 0 157 3 80 H 0 244 5 80 VARIATIONS INCHES MILLIMETERS TOP VIEW DIM MIN N 5012 D 4 80 5 00 8 AA D 8 55 875 14 AB D 9 80 10 00 16 a d e s E 1 2 FRONT VIEW SIDE VIEW NOTES 1 D amp E DO NOT INCLUDE MOLD FLASH 2 MOLD FLASH OR PROTRUSIONS NOT TO EXCEED 0 15mm 006 5 LEADS BE COPLANAR WITHIN 0 10mm 004 4 CONTROLLING DIMENSION MILLIMETERS 5 6 DDALLAS PROPRIETARY INFORMATION TITLE PACKAGE OUTLINE 150 SOIC APPROVAL MEETS JEDEC 5012 N NUMBER OF PINS DOCUMENT CONTROL NO 21 0041 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in
19. modes INH is high impedance in sleep mode and disable mode MAX13021 to reduce power consumption MAKII 60V Fault Protected LIN Transceivers w 87 lt ti Vrxp I iBUS DOM MAX q BUS REC MIN i Vgup 1 VIHIRECMAS THRESHOLDS OF VrHoommax f RECEIVING NODE 1 LIN BUS SIGNAL VTH REC MIN por OF J RECEIVING NODE 1 4 BUS DOM MIN gt lt tBUS REC MAX receiving PXOU NODE 1 gt lt P rxt F RECEIVING OU NODE 2 1 TRANSCEIVER SUPPLY OF TRANSMITTING NODE Figure 4 LIN Waveform Definition Reading the Wake Up Source Flag When a wake up event is detected in sleep mode the MAX13020 MAX13021 transition to standby mode and present the wake up source flag on TXD as a strong pulldown in the case of a local wake up In the case of a remote wake up event TXD is pulled to ground only by an internal resistor The wake up source flag can be determined by connecting a pullup resistor to TXD Choose the external pullup resistor such that TXD is a MAXIM do NSLP MAX13020 logic high when a remote wake up occurs and when a MAX13021 local wake up occurs and the strong pulldown drives TXD low Figure 5 Test Circuit for AC Characteristics MAKIM 13 LCOE NXVW OCOE LXV MAX13020 MAX13021 60V Fault Protected LIN Transceivers MAXIM MAX13020 13021 Functional Diagra
20. tes 2 3 4 LOW SLOPE FAULT 1 330kQ DISABLE 0 330kO MAX13021 only High Z High impedance LIN LIN LIN 1 High Z Low slope Disabled Disabled Enabled Notes 2 3 5 Low power Note 1 Standby mode is entered automatically after a local or remote wake up event from sleep mode INH and the 30kQ termina tion resistor on LIN are enabled Note 2 The internal wake up source flag on TXD is cleared upon entering normal slope or low slope mode Note 3 The internal wake up interrupt flag on RXD is cleared upon entering normal slope or low slope mode Note 4 Drive NSLP high for longer than tgoTONORM with 1 Note 5 Drive NSLP high for longer than tgoTONORM with 1 MAXUM XD logic high to enter normal slope mode XD logic low to enter low slope mode 11 LCOE NXVW OCOE LXVMW MAX13020 MAX13021 60V Fault Protected LIN Transceivers 10pA pullup In applications where local wake up bility is not required connect NWAKE to BAT For improved EMI performance connect NWAKE to BAT through a 5kQ resistance A remote wake up event is generated when a reces sive dominant recessive sequence is detected on LIN The dominant state must be asserted longer than tBUS to generate a remote wake up Figure 3 Wake Up Source Recognition When a wake up event is detected the MAX13020 MAX13021 enter standby mode and present the wake up interrupt on RXD as a logic low The wake up source fla
21. to 125 C unless otherwise noted Typical values are at VBAT 12V and TA 25 C Positive currents flow into the device PARAMETER SYMBOL CONDITIONS Mode Change Time from Sleep Standby Mode to tGOTONORM Normal Low Slope Mode Mode Change Time from Normal Low Slope Mode to Sleep tGOTOSLEEP Mode Note 1 Guaranteed by design for VBAT VI IN 27V Note 2 Selected bit time tgi 50us 96us 20kbaud or 10 4kbaud Bus load conditions CBus RBus 1nF 1kO 6 8nF 6600 10nF 500Q Note 3 tGOTONORM is measured from rising edge of Nsp to RXD active Note 4 tGOTOSLEEP is measured from falling edge of Ns_p to RXD high impedance Typical Operating Characteristics VBAT 12V and TA 25 C unless otherwise noted SUPPLY CURRENT OPERATING CURRENT SINK CURRENT vs RXD OUTPUT vs TEMPERATURE vs SUPPLY VOLTAGE LOW VOLTAGE 5 d 30 B SLEEP MODE 3 RL 5000 gt 3 Vun Veat gt OPEMODE CL 10nF 2 20 5 Ta 125 5 15 gt 2 2 s 5 10 e a 5 LOWSLO 10 4kbps 0 0 40 25 10 5 20 35 50 65 80 95 110 125 5 10 15 20 25 30 35 40 0 1 2 3 4 5 TEMPERATURE C SUPPLY VOLTAGE V RXD OUTPUT LOW VOLTAGE V 6 MAXIA 60V Fault Protected LIN Transceivers Typical Operating Characteristics continued VBAT 1
22. ty Factor 1 0 744 x VBAT D1 tBUS REC MAX 2 x tBIT Vth DOM MAX 0 581 VBAT 50us Figure 4 Note 2 VBAT 8V to 18V LIN Duty Factor 2 Vth REC MIN 0 422 x VBAT D2 tBUS REC MAX Vth DOM MIN 0 284 VBAT 50us Figure 4 Note 2 VBAT 7V to 18V LIN Duty Factor 3 Vth REC MAX 0 778 x VBAT D3 tBUS REC MAX x tBiT h DOM MAX 0 616 x VBAT Figure 4 Note 2 h REC MIN 0 389 x VBAT LIN Duty Factor 4 0 251 x VBAT D4 tBUS REC MAX x tBiT T o 18V Figure 4 Note 2 Propagation Delay of Receiving T 18V Node 20pF Figure 4 Rising edge with respect to falling edge te RX SYM VBAT V to 18V CRxD 20pF RRXD 1kQ Receiver Propagation Delay Symmetry Continuously Dominant Clamped t Normal low slope mode MAX13021 LIN Bus Detection Time LIN DOM DET UIN GND Continuously Dominant Clamped Normal low slope mode MAX13021 tLIN DOM REC LIN Bus Recovery Time VLIN GND Dominant Time for Wake Up of the LIN Transceiver tBUS Sleep mode Figure 3 TXD Permanent Dominant t Normal low slope mode Disable Time TXD DOMYDIS GND Dominant Time for Wake Up Through NWAKE tNWAKE Sleep mode MAKINI 5 LZOELXVNW OZOE LXVMI MAX13020 MAX13021 60V Fault Protected LIN Transceivers TIMING CHARACTERISTICS continued VBAT 5V to 38V Ta 40 C
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MAXIM MAX13020/MAX13021 Manual