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for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maximintegrated.com. max13020/max13021 60v fault-protected lin transceivers general description the max13020/max13021 ?0v 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 ?0v 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. the max13020/max13021 are available in the 8-pin so package, and operate over the -40? to +125? automotive temperature range. applications +12v/+42v automotive +24v heavy truck and bus features max13020 is a pin-to-pin upgrade for tja1020 esd protection ?2kv human body model (lin) ?kv contact discharge (lin, nwake, bat) lin 2.0/sae j2602 compatible slew-rate limited transmitter for low electromagnetic emissions (eme) robust electromagnetic immunity (emi) passive behavior in unpowered state txd dominant timeout function lin bus dominant management (max13021 only) input levels compatible with +3.3v and +5v controllers integrated 30k ? termination resistor for slave applications low 4? sleep mode with local and remote wake-up detection wake-up source recognition thermal shutdown 19-0559; rev 2; 10/12 ordering information part l in b u s d o m in a n t m a n a g em en t pin-package max13020 asa+ 8 so max13021 asa+ yes 8 so max13021asa+/v+ yes 8 so bat txd rxd nslp lin gnd inh nwake microcontroller lin bus 1k ? v bat master node only +5v ldo * en max5023 max13020 max13021 *optional txd pullup resistor for reading wake-up source flag typical operating circuit note: all devices are specified over the -40? to +125? auto- motive temperature range. + denotes a lead(pb)-free/rohs-compliant package. pin configuration appears at end of data sheet.
max13020/max13021 60v fault-protected lin transceivers 2 maxim integrated absolute maximum ratings stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. (all voltages referenced to gnd, unless otherwise noted. positive currents flow into the device.) bat.........................................................................-0.3v to +40v txd, rxd, nslp.......................................................-0.3v to +7v lin ...........................................................0v to ?0v continuous lin to bat..........................................................-80v continuous nwake...................................................................-0.3v to +80v nwake current (nwake < -0.3v) ....................................-15ma inh ..............................................................-0.3v to v bat + 0.3v inh current .......................................................-50ma to +15ma continuous power dissipation 8-pin so (derate 5.9mw/? above +70?)...................471mw operating temperature range .........................-40? to +125? storage temperature range .............................-65? to +150? junction temperature ......................................................+150? lead temperature (soldering, 10s) ................................+300? soldering temperature (reflow) ......................................+260? electrical characteristics (v bat = +5v to +38v, t a = -40? to +125?, unless otherwise noted. typical values are at v bat = +12v and t a = +25?. positive currents flow into the device.) parameter symbol conditions min typ max units bat supply voltage v bat operating range 5.0 38.0 v v bat = +27v, v lin = v bat 148 sleep mode, v nwake = v bat, v txd = v nslp = v gnd v bat = +38v, v lin = v bat 8 standby mode, bus recessive, v bat = +5v to +27v, v lin = v inh = v nwake = v bat, v txd = v nslp = v gnd 100 650 1000 standby mode, bus dominant, v bat = +12v, v inh = v nwake = v bat, v lin = v txd = v nslp = v gnd 300 1000 2000 normal/low slope mode, bus recessive, v bat = +5v to +27v, v lin = v inh = v nwake = v bat, v txd = v nslp = +5v 100 650 1000 ? normal/low slope mode, bus dominant, no load, v bat = v inh = v nwake = +12v, v txd = v gnd , v nslp = +5v 1 4.5 8 ma sleep mode, bus dominant, v bat = v nwake = +12v, v lin = v txd = v nslp = v gnd 90 fault mode, bus dominant (max13021), v inh = v nwake = v bat , v lin = v gnd , v nslp = +5v 30 60 bat supply current i bat disable mode, bus dominant (max13021), v ba t = v in h = v n wak e = + 12v , v li n = v gnd 20 30 ?
max13020/max13021 60v fault-protected lin transceivers 3 maxim integrated electrical characteristics (continued) (v bat = +5v to +38v, t a = -40? to +125?, unless otherwise noted. typical values are at v bat = +12v and t a = +25?. positive currents flow into the device.) parameter symbol conditions min typ max units transmitter data input (txd) high-level input voltage v ih output recessive 2 v low-level input voltage v il output dominant 0.8 v pulldown resistance r txd 125 330 800 k ? low-level input current i il v txd = v gnd -5 0 +5 a low-level output current i ol standby mode, v nwake = v gnd , v lin = v bat , v txd = +0.4v, local wake-up request 1.5 6 ma receiver data output (rxd) low-level output current i ol v lin = v gnd , v rxd = +0.4v 1.2 4.1 ma high-level leakage current i lh normal/low slope mode, v lin = v bat , v rxd = +5v -5 0 +5 a nslp input high-level input voltage v ih 2v low-level input voltage v il 0.8 v pulldown resistance r nslp v nslp = +5v 125 330 800 k ? low-level input current i il v nslp = v gnd -5 0 +5 a nwake input high-level input voltage v ih v bat - 1.0 v low-level input voltage v il v bat - 3.3 v nwake pullup current i il v nwake = v gnd -30 -10 -3 ? high-level leakage current i lh v nwake = +38v, v bat = +38v -5 0 +5 a inh output switch on-resistance between bat and inh r sw s tand b y, nor m al /l ow sl op e m od es, i in h = - 15m a, v bat = + 12v 22 50 ? high-level leakage current i lh sleep mode, v nwake = +38v, v bat = +38v -5 0 +5 a lin bus i/o lin recessive output voltage v o ( reces ) v txd = +5v, i lin = -1? v bat -1.0v v lin dominant output voltage v o(dom) normal/low slope mode, v txd = v gnd , v bat = +7v to +27v, r term = 500 ? to bat 0.2 x v bat v
max13020/max13021 60v fault-protected lin transceivers 4 maxim integrated electrical characteristics (continued) (v bat = +5v to +38v, t a = -40? to +125?, unless otherwise noted. typical values are at v bat = +12v and t a = +25?. positive currents flow into the device.) parameter symbol conditions min typ max units high-level leakage current i lh v lin = v bat , v txd = +5v -5 0 +5 a device leakage current, v bat disconnected i l(bat) v bat = v gnd , v lin = +18v -5 0 +5 a device leakage current, gnd disconnected i l(gnd) v bat = v gnd , v lin = -18v -100 0 a lin current after short detection i il(fault) fault mode, disable mode (max13021) v lin = v gnd -10 -2 ? short-circuit recovery threshold voltage v th ( recovery ) fault mode, disable mode (max13021) v bat - 2.5 v bat - 0.9 v lin pullup current i il sleep mode, v lin = v gnd , v nslp = v gnd -10 -2 ? slave termination resistance to v bat r slave s tand b y, nor m al /l ow sl op e m od es, v lin = v gnd , v bat = + 12v 20 30 47 k ? v lin = v bat = +12v, v txd = v gnd , t < t dom 27 40 60 v lin = +12v, v bat = +27v, v txd = v gnd , t < t dom (note 1) 45 70 100 short-circuit output current i o(sc) v bat = +12v, v lin = +60v, v txd = v gnd , t < t dom 45 ma receiver dominant state v th(dom) v bat = +7v to +38v 0.4 x v bat v receiver recessive state v th(rec) v bat = +7v to +38v 0.6 x v bat v receiver-threshold center voltage v th ( center ) v bat = +7v to +38v 0.475 x v bat 0.5 x v bat 0.525 x v bat v receiver-threshold hysteresis voltage v th(hys) v bat = +7v to +38v 0.145 x v bat 0.16 x v bat 0.175 x v bat v thermal-shutdown threshold t shdn +165 ? thermal-shutdown hysteresis 10 ? esd protection human body model lin ?2 kv contact discharge iec61000-4-2 lin, nwake, bat (tested to ibee test setup) c 1 = 100nf on v bat , c 2 = 220pf on lin, r = 33k ? on nwake ? kv
max13020/max13021 60v fault-protected lin transceivers 5 maxim integrated timing characteristics (v bat = +5v to +38v, t a = -40? to +125?, unless otherwise noted. typical values are at v bat = +12v and t a = +25?. positive currents flow into the device.) parameter symbol conditions min typ max units lin duty factor 1 d1 = t bus(rec)(max) /(2 x t bit ) d1 v bat = +7v to +18v, v th(rec)(max) = 0.744 x v bat, v th(dom)(max) = 0.581 x v bat, t bit = 50? (figure 4, note 2) 0.396 lin duty factor 2 d2 = t bus(rec)(max) /(2 x t bit ) d2 v bat = +8v to +18v, v th(rec)(min) = 0.422 x v bat, v th(dom)(min) = 0.284 x v bat, t bit = 50? (figure 4, note 2) 0.581 lin duty factor 3 d3 = t bus(rec)(max) /(2 x t bit ) d3 v bat = +7v to +18v, v th(rec)(max) = 0.778 x v bat, v th(dom)(max) = 0.616 x v bat, t bit = 96? (figure 4, note 2) 0.417 lin duty factor 4 d4 = t bus(rec)(max) /(2 x t bit ) d4 v th(rec)(min) = 0.389 x v bat, v th(dom)(min) = 0.251 x v bat , v bat = +8v to +18v, t bit = 96? (figure 4, note 2) 0.590 propagation delay of receiving node t p(rx) v bat = +7v to +18v, c rxd = 20pf (figure 4) 6s receiver propagation delay symmetry t p(rx)(sym) rising edge with respect to falling edge, v bat = +7v to +18v, c rxd = 20pf, r rxd = 1k ? -2 +2 ? continuously dominant-clamped lin bus detection time t lin ( dom )( det ) normal/low slope mode (max13021), v lin = v gnd 40 80 160 ms continuously dominant-clamped lin bus recovery time t lin ( dom )( rec ) normal/low slope mode (max13021), v lin = v gnd 0.5 1 2 ms dominant time for wake-up of the lin transceiver t bus sleep mode (figure 3) 30 70 150 ? txd permanent dominant disable time t txd ( dom )( dis ) normal/low slope mode, v txd = v gnd 20 80 ms dominant time for wake-up through nwake t nwake sleep mode 7 20 50 s
max13020/max13021 60v fault-protected lin transceivers 6 maxim integrated timing characteristics (continued) (v bat = +5v to +38v, t a = -40? to +125?, unless otherwise noted. typical values are at v bat = +12v and t a = +25?. positive currents flow into the device.) parameter symbol conditions min typ max units mode change time from sleep/standby mode to normal/low slope mode t gotonorm (note 3) 2 5 10 ? mode change time from normal/low slope mode to sleep mode t gotosleep (note 4) 2 5 10 ? note 1: guaranteed by design for v bat = v lin = +27v. note 2: selected bit time, t bit = 50? or 96? (20kbaud or 10.4kbaud). bus load conditions (c bus / r bus ): 1nf/1k ? , 6.8nf/660 ? , 10nf/500 ? . note 3: t gotonorm is measured from rising edge of n slp to rxd active. note 4: t gotosleep is measured from falling edge of n slp to rxd high impedance. 0 2 1 5 4 3 6 7 9 8 10 -40 -10 5 -25 203550658095110125 supply current vs. temperature max13020 toc01 temperature ( c) supply current (ma) sleep mode v lin = v bat v bat = +38v v bat = +12v 0 5 25 40 50 operating current vs. supply voltage max13020 toc02 supply voltage (v) operating current (ma) 52025 10 15 30 35 40 low slope mode 10.4kbps normal slope mode 20kbps r l = 500 ? c l = 10nf r l = 1000 ? c l = 1nf 45 10 35 30 20 15 0 10 5 20 15 25 30 02 1345 sink current vs. rxd output low voltage max13020 toc03 rxd output low voltage (v) sink current (ma) t a = +125 c t a = +25 c t a = -40 c typical operating characteristics (v bat = +12v and t a = +25?, unless otherwise noted.)
0 15 10 5 20 25 30 35 40 45 50 02 1345 sink current vs. txd pulldown output voltage max13020 toc04 output low voltage (v) sink current (ma) t a = +125 c t a = +25 c t a = -40 c standby mode after a local 0 10 5 25 20 15 30 35 45 40 50 -40 -10 5 -25 203550658095110125 inh on-resistance vs. temperature max13020 toc05 temperature ( c) inh on-resistance ( ? ) i sink = 15ma v bat = +38v v bat = +12v 0 20 10 50 40 30 60 70 90 80 100 -40 -10 5 -25 203550658095110125 i bat fault current vs. temperature max13020 toc06 temperature ( c) i bat fault current ( a) max13020 v bat = +12v sleep mode v lin = 0v 10 s/div 2.5mhz/div lin output spectrum lin 5v/div fft 20db/div max13020 toc07 r l = 660 ? c l = 6.8nf normal scope mode 20kbps 20 s/div 2.5mhz/div lin output spectrum lin 5v/div fft 20db/div max13020 toc08 r l = 660 ? c l = 6.8nf low scope mode 10.4kbps max13020/max13021 60v fault-protected lin transceivers 7 maxim integrated 20 s/div lin transmitting normal slope mode tx 5v/div rx 5v/div max13020 toc09 r l = 1k ? c l = 1nf normal scope mode 20kbps lin 5v/div typical operating characteristics (continued) (v bat = +12v and t a = +25?, unless otherwise noted.)
max13020/max13021 60v fault-protected lin transceivers 8 maxim integrated typical operating characteristics (continued) (v bat = +12v and t a = +25?, unless otherwise noted.) 10 s/div lin transmitting normal slope mode tx 5v/div rx 5v/div max13020 toc10 r l = 660k ? c l = 6.8nf normal scope mode 20kbps lin 5v/div 10 s/div tx 5v/div rx 5v/div max13020 toc11 r l = 500k ? c l = 10nf normal scope mode 20kbps lin 5v/div lin transmitting normal slope mode 20 s/div tx 5v/div rx 5v/div max13020 toc12 r l = 1k ? c l = 1nf low scope mode 10.4kbps lin 5v/div lin transmitting low slope mode 20 s/div tx 5v/div rx 5v/div max13020 toc13 r l = 660k ? c l = 6.8nf low scope mode 10.4kbps lin 5v/div lin transmitting low slope mode 20 s/div tx 5v/div rx 5v/div max13020 toc14 r l = 500k ? c l = 10nf low scope mode 10.4kbps lin 5v/div lin transmitting low slope mode
detailed description the max13020/max13021 ?0v 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 ?0v 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 addi- 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 t gotonorm . 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. max13020/max13021 60v fault-protected lin transceivers 9 maxim integrated pin description pin name function 1 rxd data receive output, open drain. rxd is logic-low when the lin bus is dominant. rxd is active low after a wake-up event from sleep mode. 2 nslp s l eep inp ut. d r i ve n s lp l og i c- hi g h or l og i c- l ow to contr ol the op er ati ng m od e. ( s ee tab l e 1 and fi g ur es 1, 2) 3 nwake local wake-up input. present a falling edge on nwake to generate a local wake-up event. connect nwake to bat with a 5k ? resistor if local wake-up is not required. 4 txd data transmit input, cmos compatible. drive txd logic-low to force the lin bus to a dominant state in normal/low slope mode. 5 gnd ground 6 lin lin bus i/o. lin is terminated with an internal 30k ? resistor in normal slope, low slope, and standby modes. 7 bat battery voltage input. bypass bat to ground with a 0.1? ceramic capacitor as close to the device as possible. 8 inh inhibit output. inh is active high in standby and normal/low slope modes. (see table 1) normal slope mode standby mode low slope mode sleep mode t (nslp = 1 after 0 to 1) > t gotonorm txd = 1 t (nslp = 1 after 0 to 1) > t gotonorm txd = 1 t (nslp = 1 after 0 to 1) > t gotonorm txd = 0 (t nwake = 0 after 1 to 0) > t nwake or t (lin = 0 after 1 to 0) >t bus t (nslp = 0 after 1 to 0) > t gotosleep t (nslp = 0 after 1 to 0) > t gotosleep t (nslp = 1 after 0 to 1) > t gotonorm txd = 0 initial power-on state figure 1. max13020 operating modes
max13020/max13021 60v fault-protected lin transceivers 10 maxim integrated 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 t gotonorm 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 t gotosleep 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 t gotonorm to transition to normal slope or low slope 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 330k ? 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 t gotonorm to enter normal slope mode. drive nslp logic-low for longer than t gotosleep to force the device into sleep mode from normal slope mode. normal slope mode fault mode low slope mode sleep mode t (nslp = 1 after 0 to 1) > t gotonorm txd = 1 t (lin = dominant) > t lin(dom)(det) t (nslp = 0 after 1 to 0) > t gotosleep t (nslp = 0 after 1 to 0) > t gotosleep t (nslp = 1 after 0 to 1) > t gotonorm txd = 0 initial power-on state standby mode t (nslp = 1 after 0 to 1) > t gotonorm txd = 1 t (nslp = 1 after 0 to 1) > t gotonorm txd = 0 (t nwake = 0 after 1 to 0) > t nwake or t (lin = 0 after 1 to 0) >t bus t (lin = recessive) > t lin(dom)(rec) disable mode t (nwake = 0 after 1 to 0) > t nwake t (nslp = 0 after 1 to 0) > t gotosleep t (nslp = 1 after 0 to 1) > t gotonorm t (lin = dominant) > t lin(dom)(det) t (lin = recessive) > t lin(dom)(rec) figure 2. max13021 operating modes
max13020/max13021 60v fault-protected lin transceivers 11 maxim integrated 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 t gotonorm to enter low slope mode. drive nslp logic-low for longer than t gotosleep 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 t lin(dom)(det) . in fault mode, the slave termination resistor from lin to bat is disconnected, and the lin transmitter and receiver 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 t lin(dom)(rec) . disable mode (max13021) the max13021 enters disable mode from fault mode after nslp is driven logic-low for longer than t gotosleep . 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 max13021 enters fault mode when nslp is driven logic-high for longer than t gotonorm . the device enters sleep mode if a recessive state is detect- ed on lin for longer than t lin(dom)(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 t gotonorm after a falling edge. nwake is internally pulled up to bat with a mode nslp txd pulldown rxd inh transmitter receiver comments sleep 0 330k ? high-z high-z disabled disabled no wake-up events detected standby 0 330k ? or strong pulldown 0 1 disabled disabled wake-up detected from sleep mode. txd indicates wake-up source. (note 1) normal slope 1 330k ? lin 1 normal slope enabled (notes 2, 3, 4) low slope 1 330k ? lin 1 low slope enabled (notes 2, 3, 5) fault* 1 330k ? lin 1 disabled low power disable* 0 330k ? lin high-z disabled low power table 1. operating modes note 1: standby mode is entered automatically after a local or remote wake-up event from sleep mode. inh and the 30k ? 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 t gotonorm with txd logic-high to enter normal slope mode. note 5: drive nslp high for longer than t gotonorm with txd logic-low to enter low slope mode. * max13021 only. high-z = high impedance.
max13020/max13021 60v fault-protected lin transceivers 12 maxim integrated 10? pullup. in applications where local wake-up capa- bility is not required, connect nwake to bat. for improved emi performance, connect nwake to bat through a 5k ? 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 t bus 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 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 330k ? 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?. 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 t txd(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 loading the lin bus. additionally, rxd is high impedance when bat is disconnected, preventing current flow from a connected microcontroller. 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 ?kv as measured by the iec61000-4-4 contact discharge model. lin is protected to ?2kv 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 1k ? 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) modes. inh is high impedance in sleep mode and disable mode (max13021) to reduce power consumption. standby mode v lin lin recessive lin dominant t bus 0.4 x v bat 0.6 x v bat sleep mode figure 3. remote wake-up timing
max13020/max13021 60v fault-protected lin transceivers 13 maxim integrated 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 logic-high when a remote wake-up occurs, and when a local wake-up occurs and the strong pulldown drives txd low. t bit t bit t bit t bus(dom)(max) t bus(rec)(min) v th(rec)(max) v th(dom)(max) v th(rec)(min) v th(dom)(min) t bus(dom)(min) t bus(rec)(max) t p(rx1)f t p(rx1)f t p(rx2)f t p(rx2)f thresholds of receiving node 1 thresholds of receiving node 1 v txdl v sup (1) lin bus signal v rxdl1 v rxdl2 receiving node 1 receiving node 2 (1) transceiver supply of transmitting node. figure 4. lin waveform definition bat nwake txd inh nslp gnd lin rxd 0.1 f r l c l +5v max13020 max13021 figure 5. test circuit for ac characteristics
max13020/max13021 60v fault-protected lin transceivers 14 maxim integrated nslp nwake inh txd rxd bat lin txd time-out timer rxd/int sleep/normal timer wake-up timer mode control bus timer slew rate control thermal shutdown filter 30k ? gnd vbat/2 max13020 max13021 5 a functional diagram
max13020/max13021 60v fault-protected lin transceivers 15 maxim integrated chip information process: bicmos lin gnd txd 1 2 8 7 inh bat nslp nwake rxd so top view 3 4 6 5 max13020 max13021 + pin configuration package information for the latest package outline information and land patterns (foot- prints), go to www.maximintegrated.com/packages . 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 type package code outline no. land pattern no. 8 so s8+5 21-0041 90-0096
maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integr ated 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. 16 ________________________________ maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 2012 maxim integrated products, inc. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products , inc. max13020/max13021 60v fault-protected lin transceivers revision history revision number revision date description pages changed 2 10/12 added automotive qualified part to ordering information 1

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