ATA6602(2009) 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6602
(Rev.:2009)

Microcontroller with LIN Transceiver, 5V Regulator and Watchdog

Atmel Corporation 

ATA6602/ATA6603

Table 3-1. Table of Modes

Mode of

Operation

Transceiver

Pre-normal

Off

Normal

On

Silent

Off

Sleep

Off

VDD

5V

5V

5V

0V

WD_OSC

2.5V

2.5V

0V

0V

TEMP

2V

2V

0V

0V

RXD

5V

5V

5V

0V

LIN

RECESSIVE

RECESSIVE

RECESSIVE

RECESSIVE

3.3.15 Wake-up Scenarios from Silent to Sleep Mode

3.3.15.1

3.3.15.2

Remote Wake-up via Dominant Bus State

A falling edge at pin LIN followed by a dominant bus level maintained for a certain time period

(tBUS) results in a remote wake-up request. The device switches to Pre-normal mode. The VDD

voltage regulator is activated, and the internal slave termination resistor is switched on. The

remote wake-up request is indicated by a low level at pin RXD to generate an interrupt in the

microcontroller and a high level at pin TXD. The watchdog needs a trigger signal from PTRIG or

NTRIG within the lead time tD to avoid resets at NRES (see Figure 3-4 on page 10).

Local Wake-up via Pin Wake

A falling edge at pin WAKE followed by a low level maintained for a certain time period (tWAKE)

results in a local wake-up request. The extra long wake-up time (tWAKE) ensures that no tran-

sients as defined in ISO7637 create a wake-up. The device switches to Pre-normal mode. The

internal slave termination resistor is switched on. The local wake-up request is indicated by a low

level at pin RXD to generate an interrupt in the microcontroller and a low level at pin TXD. The

watchdog needs a trigger signal from PTRIG or NTRIG within the lead time tD to avoid resets at

NRES.

3.3.15.3

Wake-up Source Recognition

The device can distinguish between a local wake-up request (pin WAKE) and a remote wake-up

request (dominant LIN bus state). The wake-up source can be read on pin TXD in Pre-normal

mode. A high level indicates a remote wake-up request and a low level indicates a local wake-up

request. The wake-up request flag (signalled on pin RXD) as well as the wake-up source flag

(signalled on pin TXD) are reset immediately, if the microcontroller sets pin EN to high (see Fig-

ure 3-3 on page 9 and Figure 3-4 on page 10).

If the LIN-SBC is in Sleep mode or Silent mode and the voltage at the LIN Bus falls to a value

lower than VLINL < VS – 3.3V (see “Electrical Characteristics” on page 22, numbers 9.5 and

9.6) but remains higher than 0.6 × VS, a local wake-up is indicated after the time tWAKE by a low

level at the pins RXD and TXD (see Figure 3-7 on page 14).

13

4921E–AUTO–09/09

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