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PDF ATA6620 Data sheet ( Hoja de datos )
| Número de pieza | ATA6620 | |
| Descripción | LIN ABUS TRANSCEIVER | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• Supply Voltage up to 40V
• Operating Voltage VS = 5V to 18V
• Typically 10 µA Supply Current During Sleep Mode
• Typically 40 µA Supply Current in Silent Mode
• Linear Low-drop Voltage Regulator:
– Normal Mode: VCC = 5V ±2%/50 mA
– Silent Mode: VCC = 5V ±7%/50 mA
– Sleep Mode: VCC is Switched Off
• VCC Undervoltage Detection with Reset Output NRES (10 ms Reset Time)
• Voltage Regulator is Short-circuit and Over-temperature Protected
• LIN Physical Layer According to LIN Specification Revision 2.0
• Wake-up Capability via LIN Bus (90 µs Dominant)
• TXD Time-out Timer (9 ms)
• 60V Load-dump Protection at LIN Pin
• Bus Pin is Overtemperature and Short-circuit Protected versus GND and Battery
• High EMC Level
• 5V CMOS-Compatible I/O Pins to MCU
• ESD HBM 6kV at Pins LIN and VS
• Interference and Damage Protection According to ISO/CD7637
• Package: SO8
1. Description
ATA6620 is a fully integrated LIN transceiver, designed according to the LIN specifica-
tion 2.0, with a low-drop voltage regulator (5V/50 mA). The combination of voltage
regulator and bus transceiver makes it possible to develop simple, but powerful, slave
nodes in LIN Bus systems. ATA6620 is designed to handle the low-speed data com-
munication in vehicles (for example, in convenience electronics). Improved slope
control at the LIN driver ensures secure data communication up to 20 kBaud with an
RC oscillator for the protocol handling. The bus output is designed to withstand high
voltage. Sleep mode (voltage regulator switched off) and Silent mode (communication
off; VCC voltage on) guarantee minimized current consumption.
LIN Bus
Transceiver
with Integrated
Voltage
Regulator
ATA6620
Preliminary
Rev. 4850A–AUTO–02/05
1 page  
ATA6620 [Preliminary]
Table 4-1. Mode of Operation
Mode of
Operation
Communication
VCC
RXD
LIN
Pre-normal
OFF
5V 5V Recessive
Normal ON 5V 5V Recessive
Silent
OFF
5V 5V Recessive
Sleep
OFF
0V 0V Recessive
4.1 Normal Mode
This is the normal transmitting and receiving mode of the LIN Interface, in accordance with LIN
specification 2.0. The VCC voltage regulator operates with a 5V output voltage, with a low toler-
ance of ±2% and a maximum output current of 50 mA.
If an undervoltage condition occurs, NRES is switched to low and the ATA6620 changes state to
Pre-normal mode. All features are available.
4.2 Silent Mode
A falling edge at EN while TXD is high switches the IC into Silent mode. The TXD Signal has to
be logic high during the Mode Select window (Figure 4-2 on page 6). For EN and TXD either two
independent outputs can be used, or two outputs from the same microcontroller port; in the sec-
ond case, the mode change is only one command.
In Silent mode the transmission path is disabled. Supply current from VBatt is typically
IVSsi = 40 µA with no load at the VCC regulator.
The overall supply current from VBatt is the result of 40 µA plus the VCC regulator output current
IVCCs.
The 5V regulator is in low tolerance mode (4.65V to 5.35V) and can source up to 50 mA. In
Silent mode the internal slave 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 (typ-
ically 10 µA) between pin LIN and pin VS is present.
The Silent mode voltage is sufficient to run an external microcontroller on the ECU, for example
in Power Down mode. The undervoltage reset is VCCthS < 4.4V. If an undervoltage condition
occurs, NRES is switched to low and the ATA6620 changes state to Pre-normal mode.
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 from Silent mode to Pre-normal
mode, then the internal LIN slave termination resistor is switched on. The remote wake-up
request is indicated by a low level at pin RXD to interrupt the microcontroller. (Figure 4-5 on
page 8)
With EN high, ATA6620 switches directly from Silent to Normal mode.
4850A–AUTO–02/05
5
5 Page 
ATA6620 [Preliminary]
7. 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
Min.
Typ.
Max.
Unit
VS
- Continuous supply voltage
–0.3 +40 V
Logic pins (RxD, TxD, EN, NRES)
–0.3 +6.5 V
LIN
- DC voltage
- Transient voltage
–40
–150
+60
+100
V
V
VCC
- DC voltage
–0.3 +6.5 V
ESD (DIN EN 6100–4–2)
Pin LIN, VS versus GND according to LIN
specification EMC Evaluation V 1.3
–6
+6 kV
HBM ESD S5.1 – all pins
–2 +2 kV
CDM ESD STM 5.3.1–1999
- All pins
–500
+500
V
Junction temperature
Storage temperature
Operating ambient temperature
Thermal resistance junction to ambient
(free air)
Tj
Ts
Ta
Rthja
–40
–55
–40
+150
+150
+125
145
°C
°C
°C
K/W
Special heat sink at GND (pin 3) on PCB
Rthja
100 K/W
Thermal shutdown of VCC regulator
TVCCoff
155
165
175
°C
Thermal shutdown of LIN output
TLINoff
155
165
175
°C
Thermal shutdown hysteresis
Thys
7
°C
4850A–AUTO–02/05
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet ATA6620.PDF ] | |
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