ATA6626 ATMEL Corporation, ATA6626 Datasheet - Page 7

• Manufacturer Part Number: ATA6626
• Description: (ATA6622 - ATA6626) LIN Bus Transceiver
• Manufacturer: ATMEL Corporation

4. Modes of Operation
Figure 4-1.
4.1
4.2
4986F–AUTO–07/08
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Normal Mode
Silent Mode
Communication: ON
VCC: 3.3V/5V/50 mA
Modes of Operation
with undervoltage
Watchdog: ON
Normal Mode
monitoring
b
This is the normal transmitting and receiving mode. The voltage regulator is in Normal Mode and
can source 50 mA. The undervoltage detection is activated. The watchdog needs a trigger sig-
nal from NTRIG to avoid resets at NRES. If NRES is switched to low, the IC changes state to
Fail-safe Mode.
A falling edge at EN when TXD is high switches the IC into Silent Mode. The TXD Signal has to
be logic high during the Mode Select window (see
is disabled in Silent Mode. The overall supply current from V
57 µA plus the VCC regulator output current I
The 3.3V/5V regulator with a 2% tolerance can source up to 50 mA. The internal slave termina-
tion between the LIN pin and the VS pin is disabled in Silent Mode to minimize the power
dissipation in the event that the LIN pin is short-circuited to GND. Only a weak pull-up current
(typically 10 µA) between the LIN pin and the VS pin is present. Silent Mode can be activated
independently from the actual level on the LIN, WAKE, or KL_15 pins. If an undervoltage condi-
tion occurs, the NRES is switched to low, and the IC changes its state to Fail-safe Mode.
e
EN = 1
TXD = 1
TXD = 0
EN = 0
EN = 1
EN = 0
with undervoltage monitoring
Communication: OFF
VCC: 3.3V/5V/50 mA
Go to sleep command
Go to silent command
Local wake-up event
Unpowered Mode
Fail-safe Mode
Watchdog: ON
b
V
Batt
= 0V
a
ATA6622/ATA6624/ATA6626
EN = 1
c + d
VCC
Communication: OFF
VCC: switched off
b
Watchdog: OFF
.
Sleep Mode
Figure 4-2 on page
c + d + e
with undervoltage monitoring
a: V
b: V
c: Bus wake-up event
d: Wake up from WAKE or KL_15 pin
e: NRES switches to low
Communication: OFF
VCC: 3.3V/5V/50 mA
b
Watchdog: OFF
S
S
Silent Mode
> 5V
< 4V
Batt
is a combination of the I
8). The transmission path
VSsi
7