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features ? operating range from 5v to 27v baud rate up to 20 kbaud improved slew rate control according to lin specification 2.0 and saej2602-2 fully compatible with 3.3v and 5v devices dominant time-out function at transmit data (txd) normal and sleep mode wake-up capability via lin bus (90 s dominant) external wake-up via wake pin (35 s low level) control of external voltage regulator via inh pin very low standby current during sleep mode (10 a) wake-up source recognition bus pin short-circuit protected versus gnd and battery lin input current typically 5 a if v bat is disconnected overtemperature protection high emc level interference and damage protec tion according to iso/cd 7637 esd hbm 6 kv at lin bus pin and supply vs pin 1. description the ata6662 is a fully integrated lin transceiver complying with the lin specification 2.0 and saej2602-2. it interfac es the lin protocol handler and the phys- ical layer. the device is designed to handle the low-speed data communication in vehicles, for example, in co nvenience electronics. improved slope control at the lin bus ensures secure data communication up to 20 kbaud with an rc oscillator for pro- tocol handling. sleep mode guarantees minimal current consumption. the ata6662 has advanced emi and esd performance. figure 1-1. block diagram vs gn d 5 6 lin 7 1 4 rxd txd wake en 3 28 inh short circuit and over- temperature protection receiver filter wake-up bus timer slew rate control txd time-out timer vs wake-up timer standby mode vs control unit lin transceiver ata6662 preliminary 4916e?auto?02/07
2 4916e?auto?02/07 ata6662 [preliminary] 2. pin configuration figure 2-1. pinning so8 rxd en wake txd inh vs lin gnd 1 2 3 4 8 7 6 5 table 2-1. pin description pin symbol function 1 rxd receive data output (open drain) 2 en enables normal mode; when the input is open or low, the device is in sleep mode 3 wake high voltage input for local wake-up request 4 txd transmit data input; active low output (strong pull-down) after a local wake-up request 5 gnd ground, heat sink 6 lin lin bus line input/output 7 vs battery supply 8inh battery-related inhibit output for controlling an external voltage regulator; active high after a wake-up request
3 4916e?auto?02/07 ata6662 [preliminary] 3. functional description 3.1 supply pin (v s ) undervoltage detection is implemented to disable transmission if v s falls to a value below 5v in order to avoid false bus messages. after switching on v s , the ic switches to pre-normal mode and inhibit is switched on. the supply current in sleep mode is typically 10 a. 3.2 ground pin (gnd) the ata6662 is neutral on the lin pin in the case of a gnd disconnection. it is able to handle a ground shift up to 11.5% of v s . 3.3 bus pin (lin) a low-side driver with internal current limitation and thermal shutdown and an internal pull-up resistor are implemented as specified for lin 2.0. the voltage range is from ?27v to +40v. this pin exhibits no reverse current from the lin bus to v s , even in the case of a gnd shift or v batt disconnection. the lin receiver thresholds are co mpatible to the lin protocol specification.the fall time (from recessive to dominant) and the rise time (from dominant to recessive) are slope controlled. the output has a self-adapting short circuit limitation; that is, during current limitation, as the chip temperature increases, the current is reduced. 3.4 input pin (txd) this pin is the microcontroller interface to control the state of the lin output. txd is low to bring lin low. if txd is high, the lin output transistor is turned off. then, the bus is in recessive mode via the internal pull-up resistor. the txd pin is compatible to both a 3.3v or 5v supply. 3.5 txd dominant ti me-out function the txd input has an internal pull-down resistor. an internal timer prevents the bus line from being driven permanently in dominant state. if txd is forced low longer than t dom > 6 ms, the pin lin will be switched off (recessi ve mode). to reset this mode, switch txd to high (>10 s) before switching lin to dominant again. 3.6 output pin (rxd) this pin reports to the microcontroller the state of the lin bus. lin high (recessive) is reported by a high level at rxd, lin low (dominant) is reported by a low voltage at rxd. the output is an open drain, therefore, it is compatible to a 3.3v or 5v power supply. the ac characteristics are defined with a pull-up resistor of 5 k ? to 5v and a load capacitor of 20 pf. the output is short-current protected. in unpowered mode (v s = 0v), rxd is switched off. for esd protection a zener diode is integrated, with v z =6.1v.
4 4916e?auto?02/07 ata6662 [preliminary] 3.7 enable i nput pin (en) this pin controls the operation mode of the interface. if en = 1, the interface is in normal mode, with the transmission path from txd to lin and from lin to rx both active. a falling edge on en while txd is already set to high, the devic e is switched to sleep mode and no transmission is possible. in sleep mode, the lin bus pin is connected to v s with a weak pull-up current source. the device can transmit only after being woken up (see section 3.8 , ?inhibit output pin (inh)? ). during sleep mode the device is still supplied from the battery volt age. the supply current is typ- ically 10 a. the pin en provides a pull-down resistor in order to force the transceiver into sleep mode in case the pin is disconnected. 3.8 inhibit output pin (inh) this pin is used to control an external switchable voltage regulator having a wake-up input. the inhibit pin provides an internal switch towards pin v s . if the device is in normal mode, the inhibit high-side switch is turned on and the external voltage regulator is activated. when the device is in sleep mode, the inhibit switch is turn ed off and disables the voltage regulator. a wake-up event on the lin bus or at pin wake will switch the inh pin to the v s level. after a system power-up (v s rises from zero), the pin inh switches automatically to the v s level. the r dson of the high-side output is < 1 k ? . 3.9 wake-up input pin (wake) this pin is a high-voltage input used to wake the device up from sleep mode. it is usually con- nected to an external switch in the application to generate a local wake-up. if you do not need a local wake-up in your application, connect pin wake directly to pin vs. a pull-up current source with typically ?10 a is implemented. the voltage threshold for a wake-up signal is 3v below the vs voltage with an output current of typically ?3 a. wake-up events from sleep mode: lin bus en pin wake pin figure 3-1 on page 6 , figure 3-2 on page 7 and figure 3-3 on page 7 show details of wake-up operations.
5 4916e?auto?02/07 ata6662 [preliminary] 3.10 operation modes 1. normal mode this is the normal transmitting and rece iving mode. all features are available. 2. sleep mode in this mode the transmission path is disabled and the device is in low power mode. supply current from v batt is typically 10 a. a wake-up signal from the lin bus or via pin wake will be detected and will switch the devi ce to pre-normal mode. if en then switches to high, normal mo de is activated. input debounce ti mers at pin wake (t wake ), lin (t bus ) and en (t sleep ,t nom ) prevent unwanted wake-up events due to auto- motive transients or emi. in sleep mode the inh pin is left floating. the internal termination between pin lin and pin v s is disabled to minimize the power dissipation in case pin lin is short-circuited to gnd. on ly a weak pull-up current (typical 10 a) between pin lin and pin v s is present. the sleep mode can be activated independently from the actual level on pin lin or wake, guaranteeing that the lowest power con- sumption is achievable even in the case of a continuous dominant level on pin lin or a continuous low on pin wake. 3. pre-normal mode at system power-up, the device automatically switches to pre-normal mode. it switches the inh pin to a high state, to the v s level. the microcontro ller of the application will then confirm the normal mode by setting the en pin to high. 3.11 remote wake-up via dominant bus state a voltage less than the lin pre-wake detection v linl at pin lin activates the internal lin transceiver. a falling edge at pin lin, followe d by a dominant bus level v busdom maintained for a certain time period (t bus ) and a rising edge at pin lin results in a remote wake-up request. the device switches to pre-normal mode. pin inh is activat ed (switches to v s ) and the internal termination resistor is s witched on. the remote wake-up request is indicated by a low level at pin rxd to interrupt the microcontroller (see figure 3-2 on page 7 ). 3.12 local wake-up via pin wake a falling edge at pin wake, follo wed by a low level maintained for a certain time period (t wake ), results in a local wake-up request. the wake-up time (t wake ) ensures that no transient, accord- ing to iso7637, creates a wake-up. the device switches to pre-normal mode. pin inh is activated (switches to v s ) and the internal termination resistor is switched on. the local wake-up request is indicated by a low level at pin rxd to interrupt the microcontroller and a strong pull-down at pin txd (see figure 3-3 on page 7 ). the voltage threshold for a wake-up signal is 3v below the vs voltage with an output current of typical ?3 a. even in the case of a continu- ous low at pin wake it is possible to switch the ic into sleep mode via a low at pin en. the ic will stay in sleep mode for an unlimited time. to generate a ne w wake up at pin wake it needs first a high signal > 6 s before a negative edge starts the wake-up filtering time again.
6 4916e?auto?02/07 ata6662 [preliminary] 3.13 wake-up source recognition the device can distinguis h between a local wake-up request (pin wake) and a remote wake-up request (dominant lin bus). the wake-up source can be read on pin txd in pre-normal mode. if an external pull-up re sistor (typically 5 k ? ) has been added on pin txd to the power supply of the microcontroller, a high level indicates a remote wake-up request (weak pull-down at pin txd) and a low level indicates a local wake -up request (strong pull-down at pin txd). the wake-up request flag (signalled on pin rxd) as well as the wake-up source flag (signalled on pin txd) are reset immediately if the mi crocontroller sets pin en to high (see figure 3-2 on page 7 and figure 3-3 on page 7 ). figure 3-1. mode of operation 3.14 fail-safe features there are now reverse currents < 15 a at pin lin during loss of v bat or gnd; this is optimal behavior for bus systems where some slave nodes are supplied from battery or ignition. pin en provides a pull-down resistor to force the transceiver into sleep mode if en is disconnected. pin rxd is set floating if v bat is disconnected. pin txd provides a pull-down resistor to pr ovide a static low if txd is disconnected. the lin output driver has a current limitation, and if the junction temperature t j exceeds the thermal shut-down temperature t off , the output driver switches off. the implemented hysteresis, t hys , enables the lin output again after the temperature has been decreased. pre-normal mode inh: high (inh internal high-side switch on) communication: off a b sleep mode inh: high impedance (inh hs switch off) communication: off en = 0; after 1 0 while txd = 1 go to sleep command en = 1 local wake-up event a: v s > 5v b: v s < 5v c: bus wake-up event d: wake-up from wake switch b en = 1 b c d normal mode inh: high (inh hs switch on) communication: on unpowered mode v batt = 0v
7 4916e?auto?02/07 ata6662 [preliminary] figure 3-2. lin wake-up waveform diagram figure 3-3. wake-up from wa ke-up switch microcontroller start-up delay time bus wake-up filtering time (tbus) off state node in sleep state high or floating low or floating low high en high normal mode regulator wake-up time delay inh external voltage regulator rxd rxd lin bus microcontroller start-up delay time wake filtering time t wake off state node in sleep state high or floating txd weak pull-down resistor low or floating state change txd strong pull-down node in operation weak pull-down en high high low on state high regulator wake-up time delay wake pin inh en txd rxd voltage regulator
8 4916e?auto?02/07 ata6662 [preliminary] 4. absolute maximum ratings stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions beyond t hose indicated in the operational sections of this specification is not implied. exposure to absolute maximum rati ng conditions for extended periods may affect device reliability . parameters symbol min. typ. max. unit v s - continuous supply voltage ?0.3 +40 v wake dc and transient voltage (with 33-k ? serial resistor) - transient voltage due to iso7637 (coupling 1 nf) ?1 ?150 +40 +100 v v logic pins (rxd, txd, en) ?0.3 +5.5 v lin - dc voltage - transient voltage due to iso7637 (coupling 1 nf) ?27 ?150 +40 +100 v v inh - dc voltage ?0.3 +40 v according to ibee lin emc test specification 1.0 following iec 61000-4-2 - pin vs, lin to gnd - pin wake (33 k ? serial resistor) 6 5 kv kv esd hbm following stm5.1 with 1.5 k ? /100 pf - pin vs, lin, wake to gnd - pin inh to gnd 8 6 kv kv hbm esd ansi/esd-stm5.1 jesd22-a114 aec-q100 (002) 3 kv cdm esd stm 5.3.1 750 v junction temperature t j ?40 +150 c storage temperature t stg ?55 +150 c thermal shutdown t off 150 165 180 c thermal shutdown hysteresis t hys 5 1020c note: 1. equivalent to discharge a 100-pf capacitor through a 1.5-k ? resistor. 5. thermal resistance parameters symbol min. typ. max. unit thermal resistance junction ambient r thja 145 k/w special heat sink at gnd (pin 5) on pcb (fused lead frame to pin 5) r thja 80 k/w
9 4916e?auto?02/07 ata6662 [preliminary] 6. electrical characteristics 5v < v s < 27v, t j = ?40c to +150c no. parameters test conditions pin symbol min. typ. max. unit type* 1v s pin 1.1 dc voltage range nominal 7 v s 513.527 v a 1.2 supply current in sleep mode sleep mode v lin > v batt ? 0.5v v batt < 14v 7i vsstby 10 20 a a 1.3 supply current in normal mode bus recessive 7 i vsrec 1.6 3 ma a 1.4 bus dominant total bus load > 500 ? 7i vsdom 1.6 3 ma a 1.5 v s undervoltage threshold v sth 44.65 v a 1.6 v s undervoltage threshold hysteresis 7v sth_hys 0.2 v a 2 rxd output pin (open drain) 2.1 low-level input current normal mode v lin = 0v, v rxd = 0.4v 1i rxdl 1.3 2.5 8 ma a 2.2 rxd saturation voltage 5-k ? pull-up resistor to 5v 1 vsat rxd 0.4 v a 2.3 high-level leakage current normal mode v lin = v bat , v rxd = 5v 1i rxdh ?3 +3 a a 2.4 esd zener diode i rxd = 100 a 1 vz rxd 5.8 8.6 v a 3 txd input pin 3.1 low-level voltage input 4 v txdl ?0.3 +0.8 v a 3.2 high-level voltage input 4 v txdh 27va 3.3 pull-down resistor v txd = 5v 4 r txd 125 250 600 k ? a 3.4 low-level leakage current v txd = 0v 4 i txd ?3 +3 a a 3.5 low-level input current at local wake-up request pre-normal mode v lin = v bat ; v wake = 0v 4i txdwake 1.3 2.5 8 ma a 4en input pin 4.1 low-level voltage input 2 v enl ?0.3 +0.8 v a 4.2 high-level voltage input 2 v enh 27va 4.3 pull-down resistor v en = 5v 2 r en 125 250 600 k ? a 4.4 low-level input current v en = 0v 2 i en ?3 +3 a a 5 inh output pin 5.1 high-level voltage normal mode i inh = ?200 a 8v inhh v s ? 0.8 v s va 5.2 high-level leakage current sleep mode v inh = 27v, v batt = 27v 8i inhl ?3 +3 a a 6 wake pin 6.1 high-level input voltage 3 v wakeh v s ? 1v v s + 0.3v va 6.2 low-level input voltage i wake = typically ?3 a 3 v wakel ?1v v s ? 3v va 6.3 wake pull-up current v s < 27v 3 i wake ?30 ?10 a a 6.4 high-level leakage current v s = 27v, v wake = 27v 3 i wake ?5 +5 a a *) type means: a = 100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter
10 4916e?auto?02/07 ata6662 [preliminary] 7 lin bus driver 7.1 driver recessive output voltage r load = 500 ? /1k ? 6v busrec 0.9 v s v s va 7.2 driver dominant voltage v busdom_drv_losup v vs = 7v, r load = 500 ? 6v _losup 1.2 v a 7.3 driver dominant voltage v busdom_drv_hisup v vs = 18v, r load = 500 ? 6v _hisup 2va 7.4 driver dominant voltage v busdom_drv_losup v vs = 7v, r load = 1000 ? 6v _losup_1k 0.6 v a 7.5 driver dominant voltage v busdom_drv_hisup v vs = 18v, r load = 1000 ? 6v _hisup_1k_ 0.8 v a 7.6 pull-up resistor to v s the serial diode is mandatory 6r lin 20 30 60 k ? a 7.7 lin current limitation v bus = v bat_max 6i bus_lim 40 120 200 ma a 7.8 input leakage current at the receiver, including pull-up resistor as specified input leakage current driver off v bus = 0v, v batt = 12v 6i bus_pas_dom ?1 ma a 7.9 leakage current lin recessive driver off 8v < v bat < 18v 8v < v bus < 18v v bus v bat 6i bus_pas_rec 15 20 a a 7.10 leakage current at ground loss; control unit disconnected from ground; loss of local ground must not affect communication in the residual network gnd device = v s v bat =12v 0v < v bus < 18v 6i bus_no_gnd ?10 +0.5 +10 a a 7.11 node has to sustain the current that can flow under this condition; bus must remain operational under this condition v bat disconnected v sup_device = gnd 0v < v bus < 18v 6i bus 515aa 8 lin bus receiver 8.1 center of receiver threshold v bus_cnt = (v th_dom + v th_rec )/2 6v bus_cnt 0.475 v s 0.5 v s 0.525 v s va 8.2 receiver dominant state v en = 5v 6 v busdom ?27 0.4 v s va 8.3 receiver recessive state v en = 5v 6 v busrec 0.6 v s 40 v a 8.4 receiver input hysteresis v hys = v th_rec ? v th_dom 6v bushys 0.028 v s 0.1 v s 0.175 v s va 8.5 pre-wake detection lin high-level input voltage 6v linh v s ? 1v v s + 0.3v va 8.6 pre-wake detection lin low-level input voltage switches the lin receiver on 6v linl ?27v v s ? 3.3v va 6. electrical characteristics (continued) 5v < v s < 27v, t j = ?40c to +150c no. parameters test conditions pin symbol min. typ. max. unit type* *) type means: a = 100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter
11 4916e?auto?02/07 ata6662 [preliminary] 9 internal timers 9.1 dominant time for wake-up via lin bus v lin = 0v 6 t bus 30 90 150 s a 9.2 time of low pulse for wake-up via pin wake v wake = 0v 3 t wake 73550sa 9.3 time delay for mode change from pre-normal mode to normal mode via pin en v en = 5v 2 t norm 2 7 15 s a 9.4 time delay for mode change from normal mode into sleep mode via pin en v en = 0v 2 t sleep 2 7 12 s a 9.5 txd dominant time out timer v txd = 0v 4 t dom 6920msa 9.6 power-up delay between v s = 5v until inh switches to high v vs = 5v t vs 200 s a 10 lin bus driver (see figure 6-1 on page 12 ) bus load conditions: load1, small, 1 nf 1 k ? ; load2, big, 10 nf 500 ? ; r rxd = 5 k ? ; c rxd = 20 pf; the following two rows specify the timing para meters for proper operation at 20.0 kbits/s. 10.1 duty cycle 1 th rec(max) = 0.744 v s th dom(max) = 0.581 v s v s = 7.0v to 18v t bit = 50 s d1 = t bus_rec(min) /(2 t bit ) d1 0.396 a 10.2 duty cycle 2 th rec(min) = 0.422 v s th dom(min) = 0.284 v s v s = 7.0v to 18v t bit = 50 s d2 = t bus_rec(max) /(2 t bit ) d2 0.581 a 10.3 duty cycle 3 th rec(max) = 0.778 v s th dom(max) = 0.616 v s v s = 7.0v to 18v t bit = 96 s d3 = t bus_rec(min) /(2 t bit ) lin d3 0.417 a 10.4 duty cycle 4 th rec(max) = 0.389 v s th dom(max) = 0.251 v s v s = 7.0v to 18v t bit = 96 s d4 = t bus_rec(min) /(2 t bit ) lin d4 0.590 a 11 receiver electrical ac parameters of the lin physical layer lin receiver, rxd load conditions (c rxd ): 20 pf, r pull-up = 5 k ? 11.1 propagation delay of receiver (see figure 6-1 on page 12 ) t rec_pd = max(t rx_pdr , t rx_pdf ) v s = 7.0v to 18v t rx_pd 6sa 11.2 symmetry of receiver propagation delay rising edge minus falling edge t rx_sym = t rx_pdr ? t rx_pdf v s = 7.0v to 18v t rx_sym ?2 +2 s a 6. electrical characteristics (continued) 5v < v s < 27v, t j = ?40c to +150c no. parameters test conditions pin symbol min. typ. max. unit type* *) type means: a = 100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter
12 4916e?auto?02/07 ata6662 [preliminary] figure 6-1. definition of bus timing parameter vs (transceiver supply of transmitting node) txd (input to transmitting node) rxd (output of receiving node 1) lin bus signal t bit t bus_dom(max) t bus_dom(min) t bus_rec(min) t bus_rec(max) rxd (output of receiving node 2) threc(max) thdom(max) thdom(min) threc(min) thresholds of receiving node 1 thresholds of receiving node 2 t rx_pdf(1) t rx_pdr(1) t rx_pdr(2) t rx_pdf(2) t bit t bit
13 4916e?auto?02/07 ata6662 [preliminary] figure 6-2. application circuit v s v s inh 8 en 2 rxd 12v 5v vbattery sci 5 k ? 1k 100 nf ata6662 33 k ? 10 k ? 1 short circuit and overtemperature protection control unit slew rate control wake-up bus timer filter master node pull-up wake-up timer txd time-out timer standby mode receiver wake 3 txd microcontroller io vdd external switch 4 5 gnd 6 7 vs lin lin sub bus 220 pf 22 f
14 4916e?auto?02/07 ata6662 [preliminary] 8. package information 7. ordering information extended type number package remarks ATA6662-TAQY so8 lin transceiver, pb-free technical drawings according to din specifications package so8 dimensions in mm 5.00 4.85 0.4 1.27 3.81 1.4 0.25 0.10 5.2 4.8 3.7 3.8 6.15 5.85 0.2 85 14
15 4916e?auto?02/07 ata6662 [preliminary] 9. revision history please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. revision no. history 4916e-auto-02/07 ? section 4 ?absolute maximum ratings? on page 8 changed ? section 2 ?electrical characteristics? on pages 9 to 11 changed 4916d-auto-02/07 ? features on page 1 changed ? section 1 ?description? on page 1 changed ? table 2-1 ?pin description? on page 2 changed ? section 3.2 ?ground pin (gnd) on page 3 changed ? section 3.7 ?enable input pin (en)? on page 4 changed ? section 3.11 ?remote wake-up via dominat bus state? on page 5 changed ? figure 3-1 ?mode of operation? on page 6 changed ? section 3-14 ?fail-safe features? on page 6 changed ? section 4 ?absolute maximum ratings? on page 8 changed ? section 6 ?electrical characteristics? on pages 9 to 11 changed
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