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PDF ATA6624 Data sheet ( Hoja de datos )
| Número de pieza | ATA6624 | |
| Descripción | (ATA6622 - ATA6626) LIN Bus Transceiver | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• Mastwerwawn.DdaStalSahveeeOt4Upe.croamtion Possible
• Supply Voltage up to 40V
• Operating voltage VS = 5V to 27V
• Typically 10 µA Supply Current During Sleep Mode
• Typically 57 µA Supply Current in Silent Mode
• Linear Low-drop Voltage Regulator:
– Normal, Fail-safe, and Silent Mode
– ATA6622 VCC = 3.3V ±2%
– ATA6624 VCC = 5.0V ±2%
– ATA6626 VCC = 5.0V ±2%, TXD Time-out Timer Disabled
– In Sleep Mode VCC is Switched Off
• VCC- Undervoltage Detection (4 ms Reset Time) and Watchdog Reset Logical
Combined at Open Drain Output NRES
• Negative Trigger Input for Watchdog
• Boosting the Voltage Regulator Possible with an External NPN Transistor
• LIN Physical Layer According to LIN 2.0 Specification and SAEJ2602-2
• Wake-up Capability via LIN-bus, Wake Pin, or Kl_15 Pin
• INH Output to Control an External Voltage Regulator or to Switch off the Master Pull Up
Resistor
• TXD Time-out Timer; ATA6626 TXD Time-out Timer Is Disabled
• Bus Pin is Overtemperature and Short Circuit Protected versus GND and Battery
• Adjustable Watchdog Time via External Resistor
• Advanced EMC and ESD Performance
• ESD HBM 8 kV at Pins LIN and VS According to STM5.1
• Package: QFN 5 mm × 5 mm with 20 Pins
LIN Bus
Transceiver
with 3.3V (5V)
Regulator and
Watchdog
ATA6622
ATA6624
ATA6626
1. Description
The ATA6622 is a fully integrated LIN transceiver, which complies with the LIN 2.0
and SAEJ2602-2 specifications. It has a low-drop voltage regulator for 3.3V/50 mA
output and a window watchdog. The ATA6624 has the same functionality as the
ATA6622; however, it uses a 5V/50 mA regulator. The ATA6626 has the same func-
tionality as ATA6624 without a TXD time-out timer. The voltage regulator is able to
source 50 mA up to VS = 18V. The output current of the regulator can be boosted by
using an external NPN transistor. This chip combination makes it possible to develop
inexpensive, simple, yet powerful slave and master nodes for LIN-bus systems.
ATA6622/ATA6624/ATA6626 are designed to handle the low-speed data communica-
tion in vehicles, e.g., in convenience electronics. Improved slope control at the
LIN-driver ensures secure data communication up to 20 kBaud. Sleep Mode and
Silent Mode guarantee very low current consumption. The ATA6626 is able to switch
the LIN unlimited to dominant level via TXD for low data rates.
4986F–AUTO–07/08
1 page  
ATA6622/ATA6624/ATA6626
3.7 Input/Output Pin (TXD)
www.DataSheet4U.com In Normal Mode the TXD pin is the microcontroller interface used to control the state of the LIN
output. TXD must be pulled to ground in order to have a low LIN-bus. If TXD is high or uncon-
nected (internal pull-up resistor), the LIN output transistor is turned off, and the bus is in
recessive state. During Fail-safe Mode, this pin is used as output. It is current-limited to < 8 mA.
and is latched to low if the last wake-up event was from pin WAKE or KL_15.
3.8 TXD Dominant Time-out Function
The TXD input has an internal pull-up resistor. An internal timer prevents the bus line from being
driven permanently in dominant state. If TXD is forced to low for longer than tDOM > 6 ms, the
LIN-bus driver is switched to recessive state. Nevertheless, when switching to Sleep Mode, the
actual level at the TXD pin is relevant.
To reactivate the LIN bus driver, switch TXD to high (> 10 µs).
The time-out function is disabled in the ATA6626. Switching to dominant level on the LIN bus
occurs without any time limitations.
3.9 Output Pin (RXD)
The Output pin reports the state of the LIN-bus to the microcontroller. LIN high (recessive state)
is reported by a high level at RXD; LIN low (dominant state) is reported by a low level at RXD.
The output has an internal pull-up structure with typically 5 kΩ to VCC. The AC characteristics
can be defined with an external load capacitor of 20 pF.
The output is short-circuit protected. RXD is switched off in Unpowered Mode (i.e., VS = 0V).
3.10
Enable Input Pin (EN)
The Enable Input pin controls the operation mode of the interface. If EN is high, the interface is
in Normal Mode, with transmission paths from TXD to LIN and from LIN to RXD both active. The
VCC voltage regulator operates with 3.3V/5V/50 mA output capability.
If EN is switched to low while TXD is still high, the device is forced to Silent Mode. No data trans-
mission is then possible, and the current consumption is reduced to IVS typ. 57 µA. The VCC
regulator has its full functionality.
If EN is switched to low while TXD is low, the device is forced to Sleep Mode. No data transmis-
sion is possible, and the voltage regulator is switched off.
3.11
Wake Input Pin (WAKE)
The Wake Input pin is a high-voltage input used to wake up the device from Sleep Mode or
Silent Mode. It is usually connected to an external switch in the application to generate a local
wake-up. A pull-up current source, typically 10 µA, is implemented.
If a local wake-up is not needed for the application, connect the Wake pin directly to the VS pin.
3.12
Mode Input Pin (MODE)
Connect the MODE pin directly or via an external resistor to GND for normal watchdog opera-
tion. To debug the software of the connected microcontroller, connect MODE pin to 3.3V/5V and
the watchdog is switched off.
4986F–AUTO–07/08
5
5 Page 
ATA6622/ATA6624/ATA6626
Figure 4-5.
www.DataSheet4U.com
LIN Wake Up from Sleep Mode
Bus wake-up filtering time
tbus
LIN bus
Fail-safe Mode
Normal Mode
RXD
Low or floating
Low
TXD
VCC
voltage
regulator
EN
NRES
Watchdog
Off state
Floating
Watchdog off
On state
Regulator wake-up time
EN High
Reset
time
Microcontroller
start-up time delay
Start watchdog lead time td
Table 4-1.
Mode of
Operation
Fail-safe
Table of Modes
Transceiver VCC
Off 3.3V/5V
Normal
On 3.3V/5V
Silent
Sleep
Off 3.3V/5V
Off 0V
Watchdog
On
On
Off
Off
WD_OSC
1.23V
1.23V
0V
0V
INH
On
On
Off
Off
RXD
High
High
High
0V
LIN
Recessive
TXD
depending
Recessive
Recessive
4986F–AUTO–07/08
11
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet ATA6624.PDF ] | |
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