ATA6629(2014) 데이터 시트보기 (PDF) - Atmel Corporation
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ATA6629 Datasheet PDF : 26 Pages
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4.3 Sleep Mode
A falling edge at EN while TXD is low switches the IC into sleep mode. The TXD signal has to be logic low during the mode
select window (Figure 4-5 on page 10).
Figure 4-4. Switch to Sleep Mode
Normal Mode
Sleep Mode
EN
TXD
NRES
Mode select window
td = 3.2μs
VCC
Delay time sleep mode
td_sleep = maximum 20μs
LIN
LIN switches directly to recessive mode
In order to avoid any influence to the LIN-pin during switching into sleep mode it is possible to switch the EN up to 3.2µs
earlier to low than the TXD. Therefore, the best an easiest way are two falling edges at TXD and EN at the same time.
In sleep mode the transmission path is disabled. Supply current from VBatt is typically IVSsleep = 10µA. The VCC regulator is
switched off; NRES and RXD are low. The internal slave termination between pin LIN and pin VS is disabled to minimize the
current consumption in case pin LIN is short-circuited to GND. Only a weak pull-up current (typically 10µA) between pin LIN
and pin VS is present. The sleep mode can be activated independently from the current level on pin LIN.
A voltage less than the LIN pre-wake detection VLINL at pin LIN activates the internal LIN receiver and starts the wake-up
detection timer.
A falling edge at the LIN pin followed by a dominant bus level maintained for a certain time period (> tbus) and a following
rising edge at pin LIN results in a remote wake-up request. The device switches from sleep Mode to fail-safe mode.
The VCC regulator is activated, and the internal LIN slave termination resistor is switched on. The remote wake-up request is
indicated by a low level at RXD and TXD to interrupt the microcontroller (Figure 4-5 on page 10).
EN high can be used to switch directly from sleep/silent to fail-safe mode. If EN is still high after VCC ramp up and
undervoltage reset time, the IC switches to normal mode.
ATA6629/ATA6631 [DATASHEET]
9
9165F–AUTO–10/14
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