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Features
* * * * * * * * * * * * * * * * *
Operating Range from 5 V to 18 V Baud Rate up to 20 Kbaud Improved Slew Rate Control According to LIN Specification 2.0 Fully Compatible with 3.3 V and 5 V 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 (130 s Low Level) Control of External Voltage Regulator via INH Pin Very Low Standby Current During Sleep Mode (10 A) 60 V Load Dump Protection at LIN Pin (42-V Power Net) Wake-up Source Recognition Bus Pin Short-circuit Protected versus GND and Battery Overtemperature Protection High EMC Level Interference and Damage Protection According to ISO/CD 7637 ESD HBM 5 kV on LIN Bus Pin, Wake and VS
LIN Transceiver ATA6661
Description
The ATA 6661 i s a f ull y in tegra ted LIN trans ce iver ac c or din g t o th e L IN specification 2.0. It interfaces the LIN protocol handler and the physical layer. The device is designed to handle the low-speed data communication in vehicles, e.g., in convenience electronics. Improved slope control at the LIN bus ensures secure data communication up to 20 kBaud with an RC-oscillator for protocol handling. In order to comply with the 42-V power net requirements, the bus output is capable of withstanding high voltages. Sleep mode guarantees minimal current consumption.
Figure 1. Block Diagram
ATA6661 7
VS
Receiver RXD 1 + Filter 6 LIN
Wake-up bus timer TXD 4 TXD Time-out Timer VS VS Control unit WAKE 3 Wake-up timer Stand-by mode slew rate control
Short circuit and overtemperature protection
5
GND
2 EN
8 INH
Rev. 4729B-AUTO-05/04
Pin Configuration
Figure 2. Pinning SO8
RXD EN WAKE TXD 1 2 3 4 8 7 6 5 INH VS LIN GND
Pin Description
Pin 1 2 3 4 5 6 7 8 Symbol RXD EN WAKE TXD GND LIN VS INH Function Receive data output (open drain) Enables normal mode, when the input is open or low, the device is in sleep mode High voltage input for local wake-up request Transmit data input; active low output (strong pull-down) after a local wake-up request Ground LIN bus line input/output Battery supply Battery related inhibit output for controlling an external voltage regulator; active high after a wake-up request
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Functional Description
Supply Pin (VS)
Undervoltage detection is implemented to disable transmission if VS is falling to a value below 5 V 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. The ATA6661 is neutral on the LIN pin in case of a GND disconnection. It is able to handle a ground shift up to 3 V for VS > 9 V. A low-side driver with internal current limitation and thermal shutdown as well as an internal pull-up resistor according to LIN specification 2.0 are implemented. The voltage range is from -27 V to +60 V. This pin exhibits no reverse current from the LIN bus to VS, even in case of a GND shift or VBatt disconnection. The LIN receiver thresholds are compatible 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 short circuit limitation. This is a self adapting current limitation; i.e., during current limitation as the chip temperature increases so the current reduces. 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. In this case, the bus is in recessive mode via the internal pull-up resistor. The TXD pin is compatible to a 3.3 V and 5 V supply. 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 tdom > 20 ms, the pin LIN will be switched off to recessive mode. 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 3.3 V or 5 V power supply. The AC characteristics are defined with a pull-up resistor of 5 k to 5 V and a load capacitor of 20 pF. The output is short-current protected. In unpowered mode (VS = 0 V), RXD is switched off. 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. If EN = 0, the device is switched to sleep mode and no transmission is possible. In sleep mode, the LIN bus pin is connected to VS with a weak pull-up current source. The device can transmit only after being woken up (see "Inhibit Output Pin (INH)" on page 4). During sleep mode the device is still supplied from the battery voltage. The supply current is typically 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.
Ground Pin (GND) Bus Pin (LIN)
Input Pin (TXD)
TXD Dominant Time-out Function Output Pin (RXD)
Enable Input Pin (EN)
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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 VS. 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 turned 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 VS level. After a system power-up (VS rises from zero), the pin INH switches automatically to the VS level.
Wake-up Input Pin (WAKE)
This pin is a high-voltage input used to wake-up the device from sleep mode. It is usually connected 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, do not connect pin WAKE. A pull-up current source with typically 10 A is implemented. Wake-up events from sleep mode: * * * LIN bus EN pin WAKE pin
Figure 3 on page 5, Figure 4 on page 6 and Figure 5 on page 6 show details of wake-up operations.
Mode of Operation
1. Normal mode This is the normal transmitting and receiving 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 VBatt is typically 10 A. A wake-up signal from the LIN bus or via pin WAKE will be detected and switches the device to pre-normal mode. If EN, then switches to high, normal mode is activated. Input debounce timers at pin WAKE (TWAKE), LIN (TBUS) and EN (Tsleep,Tnom) prevent unwanted wake-up events due to automotive transients or EMI. In sleep mode the INH pin is floating. The internal termination between pin LIN and pin VS is disabled to minimize the power dissipation in case pin LIN is short-circuited to GND. Only a weak pull-up current (typical 10 A) between pin LIN and pin VS is present. 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 VS level. The microcontroller of the application will then confirm the normal mode by setting the EN pin to high.
Remote Wake-up via Dominant Bus State
A falling edge at pin LIN, followed by a dominant bus level maintained for a certain time period (TBUS), results in a remote wake-up request. The device switches to pre-normal mode. Pin INH is activated (switches to V S) and the internal termination resistor is switched on. The remote wake-up request is indicated by a low level at pin RXD to interrupt the microcontroller (see Figure 4 on page 6).
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Local Wake-up via Pin WAKE
A falling edge at pin WAKE, followed by a low level maintained for a certain time period (T WAKE ), results in a local wake-up request. The extra long wake-up time (T WAKE ) ensures that no transient, according to ISO7637, creates a wake-up. The device switches to pre-normal mode. Pin INH is activated (switches to VS) 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 5 on page 6). The device can distinguish 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 resistor (typically 5 k) on pin TXD to the power supply of the microcontroller has been added, 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 microcontroller sets pin EN to high (see Figure 4 on page 6 and Figure 5 on page 6). Figure 3. Mode of Operation
Wake-up Source Recognition
Unpowered Mode, VBatt = 0 V
a: VS > 5 V b: VS < 5 V c: Bus wake-up event d: Wake-up from Wake switch
b
a
Pre-normal Mode INH: high (INH internal High Side switch ON) Communication: OFF b
b
c EN = 1 d
Go To sleep command EN = 0 Normal Mode INH: high (INH HS switch ON) Communication: ON EN = 1 Local wake-up event Sleep Mode INH: high impedance (INH HS switch OFF) Communication: OFF
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Figure 4. LIN Wake-up Waveform Diagram
LIN bus
INH
Low or floating
High
RXD
High or floating Bus Wake-up filtering time (TBUS)
Low
High
Voltage Regulator
On state Off state Regulator Wake-up time delay Node ln Operation EN High
EN
Node ln sleep state
Microcontroller start-up time delay
Figure 5. LIN Wake-up from Wake-up Switch
Wake pin State change
INH
Low or floating
High
RXD
High or floating
Low
High
TXD
TXD weak pull-down resistor Wake filtering time TWAKE
TXD strong pull down
weak pull down
On state Voltage Regulator Off state Regulator Wake-up time delay EN Node ln sleep state Node ln Operation EN High
Microcontroller start-up time delay
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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 those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameters VS - Continuous supply voltage Wake DC and transient voltage (with 33 k serial resistor) - Transient voltage due to ISO7637 Logic pins (RXD, TXD, EN) LIN - DC voltage - Transient voltage due to ISO7637 INH - DC voltage ESD HBM - All pins according to ESD S 5.1 - LIN, WAKE, VBATT versus GND according to LIN specification EMC evaluation CDM ESD STM 5.3.1-1999 - All pins FCDM ESD STM 5.3.1 MM JEDEC A115A Junction temperature Storage temperature Operating ambient temperature Thermal shutdown Thermal shutdown hysteresis Tj Tstg Tamb Symbol Min. -0.3 -18 -150 -0.3 -27 -150 -0.3 -3 -5 -500 -1000 -200 -40 -55 -40 150 5 165 10 Typ. Max. +40 +40 +100 +6 +60 +100 +40 +3 +5 +500 +1000 +200 +150 +150 +125 180 20 Unit V V V V V V V kV kV V V V C C C C C
Thermal Resistance
Parameters Thermal resistance junction ambient Symbol RthJA Value 160 Unit K/W
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Electrical Characteristics
5 V < VS < 18 V, Tamb = -40C to +125C
No. 1 1.1 1.2 1.3 1.4 1.5 1.6 2 2.1 2.2 2.3 3 3.1 3.2 3.3 3.4 3.5 4 4.1 4.2 4.3 4.4 5 5.1 5.2 6 6.1 6.2 6.3 6.4 Supply current in normal mode VS undervoltage threshold VS undervoltage threshold hysteresis RXD Output Pin (Open Drain) Low level input current RXD saturation voltage High level leakage current TXD Input Pin Low level voltage input High level voltage input Pull-down resistor Low level leakage current Low-level input current at local wake-up request EN Input Pin Low level voltage input High level voltage input Pull-down resistor Low level input current INH Output Pin High level voltage High level leakage current WAKE Pin High level input voltage Low level input voltage Wake pull-up current High level leakage current VS < 27 V VS = 27 V, VWAKE = 27 V 3 3 3 3 VWAKEH VWAKEL IWAKE IWAKE VS 1V -0.3 V -30 -5 -10 +5 VS + 0.3 V VS 3V V V A A A A A A Normal mode IINH = -200 A Sleep mode VINH = 27 V, VBatt = 27 V 8 8 VINHH IINHL VS - 0.8 -3 VS +3 V A A A VEN = 5 V VEN = 0 V 2 2 2 2 VENL VENH REN IEN -0.3 2 125 -3 250 +0.8 7 600 +3 V V k A A A A A VTXD = 5 V VTXD = 0 V Pre-normal mode VLIN = VBAT; VWAKE = 0 V 4 4 4 4 4 VTXDL VTXDH RTXD ITXD ITXDwake -0.3 2 125 -3 2 5 250 +0.8 7 600 +3 8 V V k A mA A A A A A Normal mode VLIN = 0 V, VRXD = 0.4 V 5 k pull-up resistor to 5 V Normal mode VLIN = VBAT, VRXD = 5 V 1 1 1 IRXDL VsatRXD IRXDH -3 2 5 8 0.4 +3 mA V A A A A 7 Parameters VS Pin Nominal DC voltage range Supply current in sleep mode Sleep mode Vlin > VBatt - 0.5 V VBatt < 14 V Bus recessive Bus dominant Total bus load > 500 7 7 7 7 VS IVSstby IVSrec IVSdom VSth VSth_hys 3 0.2 5 13.5 10 18 20 3 4 5 V A mA mA V V A A A A A A 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
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Electrical Characteristics (Continued)
5 V < VS < 18 V, Tamb = -40C to +125C
No. 7 7.1 7.2 7.3 7.4 7.5 7.6 Parameters LIN Bus Driver Driver recessive output voltage Driver dominant voltage VBUSdom_DRV_LoSUP Driver dominant voltage VBUSdom_DRV_HiSUP Driver dominant voltage VBUSdom_DRV_LoSUP Driver dominant voltage VBUSdom_DRV_HiSUP Pull-up resistor to VS Self-adapting current limitation VBUS = VBAT_max Input leakage current at the receiver, inclusive pull-up resistor as specified VTXD = 0 V, ILIN = 0 mA VVS = 7.3 V, Rload = 500 VVS = 18 V, Rload = 500 VVS = 7.3 V, Rload = 1000 VVS = 18 V, Rload = 1000 The serial diode is mandatory Tj = 125C Tj = 27C Tj = -40C Input leakage current Driver off VBUS = 0 V, VBatt = 12 V Driver off 8 V < VBAT < 18 V 8 V < VBUS < 18 V VBUS VBAT 6 6 6 6 6 6 VBUSrec V_LoSUP V_HiSUP V_LoSUP_1k V_HiSUP_1k_ RLIN IBUS_LIM 0.6 0.8 20 52 100 150 -1 30 60 110 170 230 0.9 x VS VS 1.2 2 V V V V V k mA mA mA mA A A A A A A Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
7.7
6
A
7.8
6
IBUS_PAS_dom
A
7.9
Leakage current LIN recessive
6
IBUS_PAS_rec
20
A
A
7.10
Leakage current at ground loss, Control unit disconnected from GNDDevice = VS ground, VBAT =12 V Loss of local ground must not 0 V < VBUS < 18 V affect communication in the residual network Node has to sustain the current that can flow under this condition, bus must remain operational under this condition LIN Bus Receiver Center of receiver threshold Receiver dominant state Receiver recessive state Receiver input hysteresis VBUS_CNT = (Vth_dom + Vth_rec)/2 VEN = 5 V VEN = 5 V VHYS = Vth_rec - Vth_dom VBAT disconnected VSUP_Device = GND 0 V < VBUS < 18 V
6
IBUS_NO_gnd
-1
+1
mA
A
7.11
6
IBUS
100
A
A
8 8.1 8.2 8.3 8.4
6 6 6 6
VBUS_CNT VBUSdom VBUSrec VBUShys
0.475 x VS -27 0.6 x VS 0.028 x VS
0.5 x VS
0.525 x VS 0.4 x VS 40
V V V V
A A A A
0.1 x VS
0.175 x VS
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
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Electrical Characteristics (Continued)
5 V < VS < 18 V, Tamb = -40C to +125C
No. 9 9.1 9.2 Parameters Internal Timers Dominant time for wake-up via LIN bus Time of low pulse for wake-up via pin WAKE VLIN = 0 V VWAKE = 0 V 6 3 TBUS TWAKE Tnorm 30 60 90 130 150 200 s s A A Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
9.3
Time delay for mode change from pre-normal mode to normal VEN = 5 V mode via pin EN Time delay for mode change from normal mode into sleep mode via pin EN TXD dominant time out timer Power-up delay between VS = 5 V until INH switches to high VEN = 0 V VTXD = 0 V VVS = 5 V
2
4
15
15
s
A
9.4 9.5 9.6
2 4
Tsleep Tdom TVS
2 4
10 9
12 20 200
s ms s
A A A
10
LIN Bus Driver (see Figure 6 on page 11) Bus load conditions: Load1 small 1 nF 1 k, Load2 big 10 nF 500 , RRXD = 5 k, CRXD = 20 pF; The following two rows specifies the timing parameters for proper operation at 20.0 kBit/s. THRec(max) = 0.744 x VS THDom(max) = 0.581 x VS VS = 7.0 V to 18 V tBit = 50 s D1 = tbus_rec(min)/(2 x tBit) THRec(min) = 0.422 x VS THDom(min) = 0.284 x VS VS = 7.0 V to 18 V tBit = 50 s D2 = tbus_rec(max)/(2 x tBit)
10.1
Duty cycle 1
D1
0.396
A
10.2
Duty cycle 1
D2
0.581
A
11 11.1
Receiver Electrical AC Parameters of the LIN Physical Layer LIN receiver, RXD load conditions (CRXD): 20 pF, Rpull-up = 5 k Propagation delay of receiver (see Figure 6 on page 11) Symmetry of receiver propagation delay rising edge minus falling edge trec_pd = max(trx_pdr, trx_pdf) trx_sym = trx_pdr - trx_pdf trx_pd trx_sym -2 6 s A
11.2
2
s
A
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
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Figure 6. Definition of Bus Timing Parameter
tBit TXD (Input to transmitting Node) tBit tBit
tBus_dom(max)
tBus_rec(min)
THRec(max) VS (Transceiver supply of transmitting node) THDom(max) LIN Bus Signal THRec(min) THDom(min)
Thresholds of receiving node 1
Thresholds of receiving node 2
tBus_dom(min)
tBus_rec(max)
RXD (Output of receiving Node1) trx_pdf(1) trx_pdr(1)
RXD (Output of receiving Node2) trx_pdr(2) trx_pdf(2)
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Figure 7. Application Circuit
12
Master node pull up 12 V 5V 1k VDD
ATA6661
Microcontroller
VBatt
ATA6661
RXD
Receiver
7 6
Filter
VS
LIN sub bus
1
SCI
LIN
Short circuit and over-temperature protection Wake-up bus timer Slew rate control
TXD 4
TXD Time-out Timer
220 pF VS
Control unit
I/O VS
WAKE 3
Wakeup timer
Stand-by mode
5 2 EN 8 INH
GND
External switch
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ATA6661
Ordering Information
Extended Type Number ATA6661-TAQ Package SO8 Remarks LIN transceiver
Package Information
Package SO8
Dimensions in mm
5.00 4.85 1.4 0.4 1.27 3.81 8 5 0.25 0.10 0.2 3.8 6.15 5.85 5.2 4.8 3.7
technical drawings according to DIN specifications
1
4
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