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| ATA6616C_14 Datasheet, PDF (14/274 Pages) ATMEL Corporation – 8K/16K Flash Microcontroller with LIN Transceiver, 5V Regulator and Watchdog | |||
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Figure 3-5. Switch to Sleep Mode
Normal Mode
EN
Sleep Mode
TXD
NRES
VCC
Mode select window
td = 3.2μs
Delay time sleep mode
td_sleep = maximum 20μs
LIN
LIN switches directly to recessive mode
3.4.4
Fail-safe Mode
The device automatically switches to Fail-safe Mode at system power up and the voltage regulator is switched on (see
Figure 3-7 on page 17).The NRES output switches to low for tres = 4ms and gives a reset to the microcontroller. LIN
communication is switched off. The IC stays in this mode until EN is switched to high. The IC then changes to normal mode.
A power down of VBatt (VS < 4V) during Silent or sleep mode switches the IC into Fail-safe Mode. A low level at NRES
switches into Fail-safe Mode directly. During fail-safe Mode the TXD pin is an output and signals the last wake-up source.
3.4.5
Unpowered Mode
If you connect battery voltage to the application circuit, the voltage at the VS pin increases according to the block capacitor
(see Figure 3-7 on page 17). After VS is higher than the VS undervoltage threshold VSth, the IC mode changes from
Unpowered Mode to Fail-safe Mode. The VCC output voltage reaches its nominal value after tVCC. This time, tVCC, depends
on the VCC capacitor and the load.
The NRES is low for the reset time delay treset. During this time, treset, no mode change is possible.
14 ATA6616C/ATA6617C [DATASHEET]
9132IâAUTOâ06/14
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