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參數(shù)資料
| 型號： | ATA6661-TAQJ 19 |
| 廠商： | Atmel |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | TXRX LIN 2.0 3.3V/5V 8SOIC |
| 標準包裝： | 4,000 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | LIN |
| 電源電壓： | 3.3V，5V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
5
4729M–AUTO–02/09
ATA6661
3.10
Mode of Operation
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 V
Batt is typically 10 A. A wake-up signal from the LIN bus or via pin
WAKE will be detected and switches the device to pre-normal mode. If EN, then
switches to high, normal mode is activated. Input debounce timers at pin WAKE (t
WAKE),
LIN (t
BUS) and EN (tsleep,tnom) prevent unwanted wake-up events due to automotive tran-
sients or EMI. In sleep mode the INH pin is floating. The internal termination between
pin LIN and pin V
S is disabled to minimize the power dissipation in case pin LIN is
short-circuited to GND. Only a weak pull-up current (typical 10 A) between pin LIN and
pin V
S is present.
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 V
S level. The microcontroller of the application will
then confirm the normal mode by setting the EN pin to high.
4.
Unpowered mode
In this mode the LIN transceiver is disabled. Data communication is switched off. If V
S is
higher than V
Sth undervoltage threshold, the IC mode change from Unpowered to
Pre-normal mode.
3.11
Remote Wake-up via Dominant Bus State
A falling edge at pin LIN, followed by a dominant bus level maintained for a certain time period
(t
BUS), results in a remote wake-up request. The device switches to pre-normal mode. Pin INH is
activated (switches to V
S) 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 Fig-
ure 3-2 on page 7). The voltage threshold for a wake-up signal is 3V below the VS voltage with
an output current of typical –3 A.
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 (t
WAKE),
results in a local wake-up request. The extra long wake-up time (t
WAKE) ensures that no tran-
sient, according to ISO7637, creates a wake-up. The device switches to pre-normal mode. Pin
INH is activated (switches to V
S) 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).
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 k
Ω) on pin TXD to the power supply of the microcontroller
has been added, 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).
The wake-up request flag (signalled on pin RXD) as well as the wake-up source flag (signalled
on pin TXD) are reset immediately, if the microcontroller sets pin EN to high (see Figure 3-2 on
page 7 and Figure 3-3).
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