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參數(shù)資料
| 型號： | ATA6670-FFQW |
| 廠商： | Atmel |
| 文件頁數(shù)： | 19/19頁 |
| 文件大小： | 0K |
| 描述： | IC TXRX LIN DUAL 14VDFN |
| 標(biāo)準(zhǔn)包裝： | 6,000 |
| 系列： | * |
| 其它名稱： | ATA6670-FFQW-ND |
9
Atmel ATA6670 [DATASHEET]
9204F–AUTO–06/12
Figure 2-5. LIN Transceiver 2: Wake-up from Wake-up Switch (WAKE2)
2.14
Wake- up Source Recognition (Only available at Transceiver 2)
Transceiver 2 can distinguish between a local wake-up request at pin WAKE2 and a remote wake-up request via LIN 2. The
wake-up source can be read at pin TXD in Fail-safe mode. If an external pull up resistor (typ. 5k
Ω) has been added on pin TXD2
to the power supply of the microcontroller, a high level indicates a remote wake-up request (weak pull down at pin TXD2), a low
level indicates a local wake-up request (strong pull down at pin TXD2).
The wake-up request flag (indicated at pin RXD2) as well as the wake-up source flag (indicated at pin TXD2) are immediately
reset if the microcontroller sets pin EN2 to high (see Figure 2-5 on page 9).
2.15
Fail-safe Features
●
During a short-circuit at LIN to VBattery, the output limits the output current to IBUS_LIM. Due to the power dissipation, the
chip temperature exceeds Toff, and the LIN output is switched off. The chip cools down and after a hysteresis of Thys it
switches the output on again.
●
During a short-circuit from LIN to GND the transceiver can be switched into Sleep mode and even in this case the current
consumption is lower than 45A. If the short-circuit disappears, the transceiver starts with a remote wake-up.
●
If a transceiver is in Sleep mode and a floating condition occurs on the bus, the transceiver automatically switches back
to Sleep mode, thus decreasing current consumption to less than 45A in this case.
●
The reverse current is < 2A at pin LIN during loss of VBAT; this is optimal behavior for bus systems where some slave
nodes are supplied from battery or ignition.
●
Pin EN provides a pull-down resistor to force the transceiver into Sleep mode if EN is disconnected.
●
Pin RXD is set to floating if VBAT is disconnected.
●
Pin TXD provides a pull-down resistor to provide a static low if TXD is disconnected.
●
After switching the LIN transceiver into Normal mode the TXD pin must be pulled to high longer than 10s in order to
activate the LIN driver. This feature prevents the bus from being driven into dominant state when the LIN transceiver is
switched into Normal mode and TXD is low.
●
The INH2 output transistor at transceiver 2 is protected by temperature monitoring
Wake2 Pin
INH2
RXD2
TXD2
EN2
State change
Low or floating
Node in sleep state
Microcontroller start-up
delay time
High
Low
EN High
Weak
pull-down
Node in
operation
TXD strong pull-down
High or floating
TXD weak pull-down resistor
Wake filtering time
tWAKE
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| ATA6670-FFQW-1 | 制造商:Atmel Corporation 功能描述:2X ATA6663 MULTI-CHIP-MODULE - Tape and Reel 制造商:Atmel Corporation 功能描述:IC TXRX LIN DUAL 14VDFN |
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