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參數(shù)資料
| 型號： | ATA6670-FFQW |
| 廠商： | Atmel |
| 文件頁數(shù)： | 15/19頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX LIN DUAL 14VDFN |
| 標準包裝： | 6,000 |
| 系列： | * |
| 其它名稱： | ATA6670-FFQW-ND |
5
Atmel ATA6670 [DATASHEET]
9204F–AUTO–06/12
2.8
Enable Input Pin (EN)
This pin controls the operation mode of the LIN transceiver. If EN = 1, the LIN transceiver is in Normal mode, with the
transmission path from TXD to LIN and from LIN to RXD both active. At 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. During Sleep mode the device is still supplied
from the battery voltage. The supply current is typically 10A. The pin EN provides a pull-down resistor in order to force the
transceiver into Sleep mode in case the pin is disconnected.
2.9
WAKE-up Input Pin (WAKE2, Only Available at Transceiver 2)
This pin is a high-voltage input used to wake up the transceiver 2 from Sleep mode. It is usually connected to an external
transistor or a switch to generate a local wake-up. A pull-up current source with typically –10A is implemented as well as a
debounce timer with a typical debounce time of 35s.
Even if the WAKE2 pin is pulled to GND, it is possible to switch the transceiver 2 into Sleep mode.
If a local wake-up is not needed in the application, pin WAKE2 can be connected directly to pin VS2.
2.10
INH Output Pin (INH2, only available at Transceiver 2)
This pin is used to control an external load or to switch the LIN master pull-up resistor on/off at pin LIN2. The inhibit pin provides
an internal switch towards VS2 which is protected by temperature monitoring. If transceiver 2 is in normal or Fail-safe mode, the
inhibit high-side switch is turned on. When the transceiver 2 is in Sleep mode, the inhibit switch is turned off, thus disabling the
connected external devices.
A wake-up event on LIN2 or at pin WAKE2 puts the transceiver 2 into Fail-safe mode and as a result the INH2 switches to the
VS2 level. After a system power-up (VS2 rises from zero), the pin INH2 switches automatically to the VS2 level.
2.11
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 typi-
cally 10A. 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. Input debounce
timers at pin WAKE2 (tWAKE), LIN (tBUS) and EN (tsleep,tnom) prevent undesirable wake-up events due to automotive
transients or EMI. The internal termination between pin LIN and pin VS is disabled. Only a weak pull-up current (typi-
cal 10A) between pin LIN and pin VS is present. Sleep mode can be activated independently of the current level on
pin LIN.
3.
Fail-safe mode
At system power-up or after a wake-up event, the transceiver automatically switches to Fail-safe mode. When VS2
exceeds 5V, the transceiver 2 switches the INH2 pin to the VS2 level. LIN communication is switched off. The micro-
controller of the application then confirms Normal mode by setting the EN pin to high.
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