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ATA6628 Datasheet(PDF) 13 Page - ATMEL Corporation

Part No. ATA6628
Description  Negative Trigger Input for Watchdog
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATA6628 Datasheet(HTML) 13 Page - ATMEL Corporation

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ATA6628/ATA6630 [Preliminary]
Sleep or Silent Mode: Behavior at a Floating LIN-bus or a Short Circuited LIN to GND
In Sleep or in Silent Mode the device has a very low current consumption even during
short-circuits or floating conditions on the bus. A floating bus can arise if the Master pull-up
resistor is missing, e.g., if it is switched off when the LIN- Master is in sleep mode or even if the
power supply of the Master node is switched off.
In order to minimize the current consumption I
VS in sleep or silent mode during voltage levels at
the LIN-pin below the LIN pre-wake threshold, the receiver is activated only for a specific time
tmon. If t
mon elapses while the voltage at the bus is lower than Pre-wake detection low (VLINL)
and higher than the LIN dominant level, the receiver is switched off again and the circuit
changes back to sleep respectively Silent Mode. The current consumption is then the result of
VSsleep or IVSsilent plus ILINwake. If a dominant state is reached on the bus no wake-up will occur.
Even if the voltage rises above the Pre-wake detection high (V
LINH), the IC will stay in sleep
respectively silent mode (see Figure 4-6).
This means the LIN-bus must be above the Pre-wake detection threshold V
LINH for a few micro-
seconds before a new LIN wake-up is possible.
Figure 4-6.
Floating LIN-bus During Sleep or Silent Mode
If the ATA6628/ATA6630 is in Sleep or Silent Mode and the voltage level at the LIN-bus is in
dominant state (V
LIN < VBUSdom) for a time period exceeding tmon (during a short circuit at LIN, for
example), the IC switches back to Sleep Mode respectively Silent Mode. The V
S current
consumption then consists of I
VSsleep or IVSsilent plus ILINWAKE. After a positive edge at pin LIN the
IC switches directly to Fail-safe Mode (see Figure 4-7 on page 14).
+ ILINwake
LIN Pre-wake
LIN dominant state
Mode of
Int. Pull-up
Wake-up Detection Phase
off (disabled)
Sleep/Silent Mode
Sleep/Silent Mode

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