ATA6629_14 Datasheet, PDF (7/26 Pages) ATMEL Corporation – LIN Bus Transceiver with Integrated Voltage Regulator

4.2 Silent Mode
A falling edge at EN while TXD is high switches the IC into silent mode. The TXD signal has to be logic high during the mode
select window (Figure 4-3 on page 8). The transmission path is disabled in silent mode. The overall supply current from V_Batt
is a combination of the I_VSsilent = 35µA plus the V_CC regulator output current I_VCC.
Figure 4-2. Switch to Silent Mode
Normal Mode
Silent Mode
EN
TXD
NRES
Mode select window
t_d = 3.2μs
VCC
Delay time silent mode
t_d_sleep = maximum 20μs
LIN
LIN switches directly to recessive mode
In silent mode 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 silent mode can be activated independently from the current level on pin LIN.
If an undervoltage condition occurs, NRES is switched to low and the Atmel^® ATA6629/ATA6631 changes its state to
fail-safe mode.
A voltage less than the LIN pre-wake detection V_LINL at pin LIN activates the internal LIN receiver and starts the wake-up
detection timer.
ATA6629/ATA6631 [DATASHEET]
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