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PDF ATA6662 Data sheet ( Hoja de datos )
| Número de pieza | ATA6662 | |
| Descripción | LIN Transceiver | |
| Fabricantes | ATMEL Corporation | |
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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 VBAT 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
LIN Transceiver
ATA6662
Preliminary
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
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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
RXD 1
Receiver
Filter
7 VS
6 LIN
TXD 4
VS
WAKE 3
TXD
time-out
timer
Wake-up
timer
Wake-up bus timer
Slew rate control
Control unit
Standby mode
2
EN
Short circuit and over-
temperature protection
VS
8
INH
5 GND
4916E–AUTO–02/07
1 page  
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. Input debounce timers at pin WAKE
(TWAKE), LIN (TBUS) and EN (Tsleep,Tnom) 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 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 µA)
between pin LIN and pin VS 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 VS level. The microcontroller 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 VLINL at pin LIN activates the internal LIN
transceiver.
A falling edge at pin LIN, followed by a dominant bus level VBUSdom maintained for a certain time
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period (TBUS) and a rising edge at pin LIN results in a remote wake-up request.
The device switches to pre-normal mode. Pin INH is activated (switches to VS) 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 3-2 on page 7).
3.12
Local Wake-up via Pin WAKE
A falling edge at pin WAKE, followed by a low level maintained for a certain time period (TWAKE),
results in a local wake-up request. The wake-up time (TWAKE) 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 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 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 µA. 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 new wake up at pin WAKE it needs
first a high signal > 6 µs before a negative edge starts the wake-up filtering time again.
4916E–AUTO–02/07
5
5 Page 
ATA6662 [Preliminary]
6. Electrical Characteristics (Continued)
5V < VS < 27V, Tj = –40°C to +150°C
No. Parameters
Test Conditions
Pin Symbol Min. Typ. Max.
9 Internal Timers
9.1
Dominant time for wake-up via
LIN bus
VLIN = 0V
6 TBUS
30 90 150
9.2
Time of low pulse for wake-up
via pin WAKE
VWAKE = 0V
3 TWAKE
7 35 50
Time delay for mode change
9.3 from pre-normal mode to normal VEN = 5V
mode via pin EN
2 Tnorm
2 7 15
Time delay for mode change
9.4 from normal mode into sleep
mode via pin EN
VEN = 0V
2 Tsleep
2 7 12
9.5 TXD dominant time out timer
Power-up delay between
9.6 VS = 5V until INH switches to
high
VTXD = 0V
VVS = 5V
4 Tdom
TVS
6 9 20
200
LIN Bus Driver (see Figure 6-1 on page 12)
10 Bus load conditions: Load1, small, 1 nF 1 kΩ; Load2, big, 10 nF 500Ω; RRXD = 5 kΩ; CRXD = 20 pF;
The following two rows specify the timing parameters for proper operation at 20.0 kBits/s.
10.1
10.2
10.3
10.4
11
11.1
11.2
Duty cycle 1
THRec(max) = 0.744 × VS
THDom(max) = 0.581 × VS
VS = 7.0V to 18V
tBit = 50 µs
D1 = tbus_rec(min) / (2 × t )www.DatBaSitheet4U.com
Duty cycle 2
THRec(min) = 0.422 × VS
THDom(min) = 0.284 × VS
VS = 7.0V to 18V
tBit = 50 µs
D2 = tbus_rec(max) / (2 × tBit)
Duty cycle 3
THRec(max) = 0.778 × VS
THDom(max) = 0.616 × VS
VS = 7.0V to 18V
tBit = 96 µs
D3 = tbus_rec(min) / (2 × tBit)
LIN
Duty cycle 4
THRec(max) = 0.389 × VS
THDom(max) = 0.251 × VS
VS = 7.0V to 18V
tBit = 96 µs
D4 = tbus_rec(min) / (2 × tBit)
LIN
Receiver Electrical AC Parameters of the LIN Physical Layer
LIN receiver, RXD load conditions (CRXD): 20 pF, Rpull-up = 5 kΩ
Propagation delay of receiver
(see Figure 6-1 on page 12)
trec_pd = max(trx_pdr, trx_pdf)
VS = 7.0V to 18V
Symmetry of receiver
propagation delay rising edge
minus falling edge
trx_sym = trx_pdr – trx_pdf
VS = 7.0V to 18V
D1
D2
D3
D4
trx_pd
trx_sym
0.396
0.417
–2
0.581
0.590
6
+2
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Unit
µs
µs
µs
µs
ms
µs
µs
µs
Type*
A
A
A
A
A
A
A
A
A
A
A
A
4916E–AUTO–02/07
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ATA6662.PDF ] | |
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