Instruction Manual

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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 µs Dominant)

• External Wake-up via WAKE Pin (35 µs Low Level)

• Control of External Voltage Regulator via INH Pin

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

• Wake-up Source Recognition

• Bus Pin Short-circuit Protected versus GND and Battery

• LIN Input Current Typically 5 µA if V

BAT

Is Disconnected

• Overtemperature Protection

• High EMC Level

• Interference and Damage Protection 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 interfaces 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 convenience 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

LIN

RXD

TXD

WAKE

INH

Short circuit and over-

temperature protection

Receiver

Filter

Wake-up bus timer

Slew rate control

TXD

time-out

timer

Wake-up

timer

Standby mode

Control unit

LIN Transceiver

ATA6662

Preliminary

4916E–AUTO–02/07

Summary of content (16 pages)

PAGE 1
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.
PAGE 2
. Pin Configuration Figure 2-1. Pinning SO8 RXD EN WAKE TXD Table 2-1.
PAGE 3
ATA6662 [Preliminary] 3. Functional Description 3.1 Supply Pin (VS) Undervoltage detection is implemented to disable transmission if VS falls to a value below 5V in order to avoid false bus messages. After switching on VS, the IC switches to pre-normal mode and INHIBIT is switched on. The supply current in sleep mode is typically 10 µA. 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 VS. 3.
PAGE 4
3.7 Enable Input 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 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 Section 3.8, “Inhibit Output Pin (INH)” ).
PAGE 5
ATA6662 [Preliminary] 3.10 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 10 µA. A wake-up signal from the LIN bus or via pin WAKE will be detected and will switch the device to pre-normal mode. If EN then switches to high, normal mode is activated.
PAGE 6
3.13 Wake-up Source Recognition 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 kΩ) 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).
PAGE 7
ATA6662 [Preliminary] Figure 3-2. LIN Wake-up Waveform Diagram Bus wake-up filtering time (TBUS) LIN bus High INH Low or floating RXD High or floating Low External voltage regulator Off state Regulator wake-up time delay Normal Mode EN High RXD Node in sleep state Microcontroller start-up delay time Figure 3-3.
PAGE 8
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 Max. Unit –0.
PAGE 9
ATA6662 [Preliminary] 6. Electrical Characteristics 5V < VS < 27V, Tj = –40°C to +150°C No. 1 1.1 1.2 Parameters DC voltage range nominal Supply current in sleep mode Supply current in normal mode 1.5 VS undervoltage threshold 1.6 VS undervoltage threshold hysteresis 2 Pin Symbol Min. Typ. Max. Unit Type* 5 13.5 27 V A VS Pin 1.3 1.4 Test Conditions 7 VS Sleep mode Vlin > VBatt – 0.5V VBatt < 14V 7 IVSstby 10 20 µA A Bus recessive 7 IVSrec 1.
PAGE 10
6. Electrical Characteristics (Continued) 5V < VS < 27V, Tj = –40°C to +150°C No. 7 Parameters Test Conditions Pin Symbol Min. 0.9 × VS Typ. Max. Unit Type* VS V A LIN Bus Driver 7.1 Driver recessive output voltage RLOAD = 500Ω / 1 kΩ 6 VBUSrec 7.2 Driver dominant voltage VBUSdom_DRV_LoSUP VVS = 7V, Rload = 500Ω 6 V_LoSUP 1.2 V A 7.3 Driver dominant voltage VBUSdom_DRV_HiSUP VVS = 18V, Rload = 500Ω 6 V_HiSUP 2 V A 7.
PAGE 11
ATA6662 [Preliminary] 6. Electrical Characteristics (Continued) 5V < VS < 27V, Tj = –40°C to +150°C No. 9 Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type* Internal Timers 9.1 Dominant time for wake-up via LIN bus VLIN = 0V 6 TBUS 30 90 150 µs A 9.2 Time of low pulse for wake-up via pin WAKE VWAKE = 0V 3 TWAKE 7 35 50 µs A 9.3 Time delay for mode change from pre-normal mode to normal VEN = 5V mode via pin EN 2 Tnorm 2 7 15 µs A 9.
PAGE 12
Figure 6-1.
PAGE 13
ATA6662 [Preliminary] Figure 6-2.
PAGE 14
7. Ordering Information Extended Type Number Package ATA6662-TAQY Remarks SO8 LIN transceiver, Pb-free 8. Package Information Package SO8 Dimensions in mm 5.2 4.8 5.00 4.85 3.7 1.4 0.25 0.10 0.4 1.27 6.15 5.85 3.81 8 0.2 3.
PAGE 15
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.
PAGE 16
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