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Features

• Operating Range from 5V to 27V

• Baud Rate up to 20Kbaud

• LIN Physical Layer According to LIN Specification 2.0, 2.1 and SAEJ2602-2

• Fully Compatible with 3.3V and 5V Devices

• TXD Dominant Timeout Timer

• Normal and Sleep Mode

• Wake-up Capability via LIN Bus (90µs Dominant)

• Very Low Standby Current During Sleep Mode (10µA)

• Bus Pin is Overtemperature and Short-circuit Protected Versus GND and Battery

• LIN Input Current < 2µA if VBAT Is Disconnected

• Overtemperature Protection

• High EMC Level

• Interference and Damage Protection According to ISO/CD 7637

• Fulfills the OEM Hardware Requirements for LIN in Automotive Applications Rev. 1.1

• Transceiver 2: Additional INH High Side Switch Output and High Voltage WAKE Input

1. Description

The Atmel

ATA6670 is a fully integrated Dual-LIN transceiver complying with the LIN

specification 2.0, 2.1, and SAEJ2602-2. There are two completely independent and

separated LIN transceivers integrated in one package (only the GND pins GND1 and

GND2 are internally connected). Each of them interfaces with the LIN protocol handler

and the physical layer.

The two LIN transceivers are nearly identical, the only difference is an additional wake

input and an INH output at transceiver 2.

The device is designed to handle the low-speed data communication in vehicles, for

example, in convenience electronics. Improved slope control at the LIN bus ensures

secure data communication of up to 20Kbaud with an RC oscillator for protocol han-

dling. Sleep mode guarantees minimal current consumption for each transceiver even

in the case of a floating bus line or a short-circuit on the LIN bus to GND. The Atmel

ATA6670 features advanced EMI and ESD performance.

Dual LIN

Transceiver

Atmel ATA6670

Preliminary

9204C–AUTO–09/11

Summary of content (20 pages)

PAGE 1
Features • • • • • • • • • • • • • • • Operating Range from 5V to 27V Baud Rate up to 20Kbaud LIN Physical Layer According to LIN Specification 2.0, 2.1 and SAEJ2602-2 Fully Compatible with 3.
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Figure 1-1.
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Atmel ATA6670 [Preliminary] 2. Pin Configuration Figure 2-1. Pinning DFN14 RXD1 VS1 EN1 LIN1 TXD1 RXD2 GND1 Atmel ATA6670 EN2 VS2 WAKE2 LIN2 TXD2 Table 2-1. INH2 GND2 Pin Description Pin Symbol Function 1 RXD1 2 EN1 3 TXD1 Transmits data input 1, active low output (strong pull-down) after a local wake-up request 4 RXD2 Receives data output 2 (open drain) Receives data output 1 (open drain) Enables normal mode 1. When the input is open or low, transceiver 1 is in sleep mode.
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3. Functional Description The functions described in the following text apply to each LIN transceiver. Therefore, if pin LIN is stated, this applies to each of the two receivers (LIN1 and LIN2), which work completely independently. The only internal connection is between GND1 and GND2. The functions only available at transceiver 2 are marked accordingly. 3.1 Physical Layer Compatibility Since the LIN physical layer is independent of higher LIN layers (e.g.
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Atmel ATA6670 [Preliminary] 3.7 Output Pin (RXD) This pin reports the state of the LIN bus to the microcontroller. 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 with a 3.3V or 5V power supply. The AC characteristics are defined with a pull-up resistor of 5kΩ to 5V and a load capacitor of 20pF. The output is short current protected. In unpowered mode (VS = 0V) RXD is switched off.
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3.11 Operation Modes 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 10µA. A wake-up signal (either from the LIN bus or the WAKE2 input) is detected and switches the corresponding transceiver to fail-safe mode. If EN then switches to high, normal mode is activated.
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Atmel ATA6670 [Preliminary] 3.12 Remote Wake-up via Dominant Bus State A voltage lower than the LIN pre-wake detection VLINL at pin LIN activates the internal LIN receiver and starts the wake-up detection timer. A falling edge at pin LIN, followed by a dominant bus level VBUSdom maintained for a certain period of time (> tBUS) and a rising edge at pin LIN results in a remote wake-up request.
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Figure 3-3. Floating LIN Bus During Sleep Mode LIN Pre-wake VLINL LIN BUS LIN dominant state VBUSdom tmon IVSsleep + ILINwake IVSfail IVS IVSsleep Mode of operation Sleep Mode IVSsleep Wake-up Detection Phase Int. Pull-up Resistor RLIN Sleep Mode off (disabled) If the Atmel® ATA6670 is in sleep mode and the voltage level at the LIN is in dominant state (VLIN < VBUSdom) for a period of time exceeding tmon (during a short circuit at LIN, for example), the IC switches back to sleep mode.
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Atmel ATA6670 [Preliminary] 3.13 Local WAKE-up via Pin WAKE2 (Only Available at Transceiver 2) A falling edge at pin WAKE2 followed by a low level maintained for a certain period of time (> tWAKE) results in a local wake-up request. According to ISO 7637, the wake-up time ensures that no transients create a wake-up. The transceiver 2 then switches to fail-safe mode. Pin INH2 is activated (switches to VS2) and the internal slave termination resistor is switched on.
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3.14 Wake- up Source Recognition (Only available at Transceiver 2) Transceiver 2 can distinguish between a local wake-up request at pin WAKE2 and a remote wake-up request via LIN 2. The wake-up source can be read at pin TXD in fail-safe mode. If an external pull up resistor (typ.
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Atmel ATA6670 [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 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 Symbol Max. Unit –0.
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6. Electrical Characteristics 5V < VS < 27V, Tj = –40°C to +150°C; the values below are valid for each of the two nearly identical integrated LIN transceivers unless otherwise specified. No. 1 1.1 1.2 Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type* VS VS 5 13.5 27 V A Sleep mode VLIN > VS – 0.5V VS < 14V VS IVSsleep 10 20 µA A Sleep mode, bus shorted to GND VLIN = 0V VS < 14V VS IVSsleep_sc 23 45 µA A Bus recessive VS < 14V VS IVSrec 0.9 1.
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Atmel ATA6670 [Preliminary] 6. Electrical Characteristics (Continued) 5V < VS < 27V, Tj = –40°C to +150°C; the values below are valid for each of the two nearly identical integrated LIN transceivers unless otherwise specified. No. 5 Parameters Test Conditions Pin Symbol Min. VS2 – 0.75 Typ. Max. Unit Type* VS2 V A 50 Ω A INH 2 Output Pin (Only Available at Transceiver 2) 5.1 High-level voltage Normal or fail-safe mode IINH2 = –15mA INH2 VINH2H 5.
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6. Electrical Characteristics (Continued) 5V < VS < 27V, Tj = –40°C to +150°C; the values below are valid for each of the two nearly identical integrated LIN transceivers unless otherwise specified. No. Parameters Leakage current at loss of battery, node has to sustain the 7.12 current that can flow under this condition, bus must remain operational under this condition Test Conditions Pin Symbol VBAT disconnected VSUP_Device = GND 0V < VBUS < 18V LIN IBUS_NO_Bat LIN CLIN 7.
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Atmel ATA6670 [Preliminary] 6. Electrical Characteristics (Continued) 5V < VS < 27V, Tj = –40°C to +150°C; the values below are valid for each of the two nearly identical integrated LIN transceivers unless otherwise specified. No. Parameters Test Conditions Pin Symbol Min. Typ. Max. 10 LIN Bus Driver AC Parameter with Different Bus Loads Load 1 (small): 1nF, 1kΩ ; Load 2 (large): 10nF, 500Ω ; RRXD = 5kΩ ; CRXD = 20pF; Load 3 (medium): 6.8nF, 660Ω characterized on samples; 10.1 and 10.
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Figure 6-1.
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Atmel ATA6670 [Preliminary] Figure 6-2. Typical Application Circuit +5V VCC RXD1 RXD1 EN1 EN1 TXD1 TXD1 Microcontroller RXD2 RXD2 EN2 EN2 R5 WAKE2 2.7kΩ TXD2 TXD2 ADC GND D3 LL4148 R1 4.7kΩ R2 4.7kΩ 1 14 2 13 3 4 5 12 Atmel ATA6670 (DFN14) 11 10 6 9 7 8 R3 1kΩ VS1 LIN1 LIN1 C6 GND1 GND C4 INH2 220pF C3 C7 + D2 LL4148 220pF VS2 100nF VBAT 22µF/50V LIN2 D4 LL4148 GND2 R4 1kΩ R6 10kΩ Wake Switch LIN2 S1 R7 R8 Figure 6-3.
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7. Ordering Information Extended Type Number Package ATA6670-FFQW Remarks DFN14 LIN Transceiver, Pb-free, 6k, taped and reeled. 8. Package Information Figure 8-1. DFN14 Top View D 14 E PIN 1 ID technical drawings according to DIN specifications 1 A3 Dimensions in mm A A1 Side View Partially Plated Surface Bottom View 1 7 COMMON DIMENSIONS (Unit of Measure = mm) E2 Z 14 8 e D2 L Z 10:1 Symbol MIN NOM MAX A 0.8 0.9 1 A1 0.0 0.02 0.05 A3 0.15 0.2 0.25 D 4.4 4.5 4.
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Atmel ATA6670 [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 9204C-AUTO-09/11 • Section 7 “Ordering Information” on page 18 changed 9204B-AUTO-03/11 • Figure 1-1 “Block Diagram” on page 2 changed • Section 3.
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