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ATA6602 Datasheet(PDF) 11 Page - ATMEL Corporation |
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ATA6602 Datasheet(HTML) 11 Page - ATMEL Corporation |
11 / 362 page 11 4921C–AUTO–01/07 ATA6602/ATA6603 Figure 3-5. Switch to Sleep Mode 3.3.13.4 Pre Normal Mode At system power-up the device automatically switches to Pre Normal Mode. The voltage regula- tor is switched on V DD = 5V ±2%/50 mA (see Figure 3-7 on page 14). The NRES output switches to low for t res = 10 ms and sends a reset to the microcontroller. LIN communication is switched off and the watchdog is active. The LIN-SBC stays in this mode until EN is switched to high. If V Battery (VS < 4V) is powered down during Silent Mode or Sleep Mode, the IC powers up into Pre Normal Mode. 3.3.13.5 Unpowered Mode If you connect battery voltage to the application circuit, the voltage at the VS pin increases due to the block capacitor (see Figure 3-7 on page 14). When V S becomes higher than the VS under- voltage threshold V S_th, the IC mode changes from Unpowered Mode to Pre Normal Mode. The V DD output voltage reaches its nominal value after tVDD. This time depends on the VDD capacitor and the load. The NRES is low for the reset time delay t reset. During this time, no mode change is possible. 3.3.13.6 Debug Mode The watchdog is switched off with pin MODE high (5V) and in normal operation if it is tied to GND. Delay time Sleep Mode Td_sleep = maximum 15 µs Mode Select window LIN switches directly to recessive mode Td = 3.2 µs LIN VCC NRES TXD EN Sleep Mode |
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