ATA6621N-PGPW(2007) 데이터 시트보기 (PDF) - Atmel Corporation
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ATA6621N-PGPW Datasheet PDF : 28 Pages
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ATA6621N
3.15.6
Debug Mode
The watchdog is switched off with pin MODE high (5V) and in normal operation if it is tied to
GND (see Figure 5-2 on page 24).
Table 3-1. Table of Modes
Mode of
Operation
Transceiver
Pre-normal
Off
Normal
On
Silent
Off
Sleep
Off
VCC
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
3.16 Wake-up Scenarios from Silent or Sleep Mode
3.16.1
3.16.2
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 VCC
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. (Figure 3-3 on page 8)
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.
3.16.3
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 (Figure
3-3 on page 8).
If the ATA6621N 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” 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 (Figure 3-6 on page 12).
11
4887H–AUTO–12/07
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