ata6625-taqy ATMEL Corporation, ata6625-taqy Datasheet - Page 3

• Manufacturer Part Number: ata6625-taqy
• Description: Lin Bus Transceiver With Integrated Vol Tage Regulator
• Manufacturer: ATMEL Corporation

3. Functional Description
3.1
3.2
3.3
3.4
3.5
3.6
4957F–AUTO–02/08
Physical Layer Compatibility
Supply Pin (VS)
Ground Pin (GND)
Voltage Regulator Output Pin (VCC)
Undervoltage Reset Output (NRES)
Bus Pin (LIN)
Since the LIN physical layer is independent from higher LIN layers (e.g., LIN protocol layer), all
nodes with a LIN physical layer according to revision 2.0 can be mixed with LIN physical layer
nodes, which are according to older versions (i.e., LIN 1.0, LIN 1.1, LIN 1.2, LIN 1.3) without any
restrictions.
LIN operating voltage is V
transmission if V
the IC starts with the Fail-safe Mode and the voltage regulator is switched on (i.e.,
3.3V/5V/50 mA).
The supply current in Sleep Mode is typically 10 µA and 57 µA in Silent Mode.
The IC is neutral on the LIN pin in the event of GND disconnection. It is able to handle a ground
shift up to 11.5% of V
The internal 3.3V/5V voltage regulator is capable of driving loads with up to 50 mA, supplying
the microcontroller and other ICs on the PCB and is protected against overload by means of cur-
rent limitation and overtemperature shut-down. Furthermore, the output voltage is monitored
and will cause a reset signal at the NRES output pin if it drops below a defined threshold V
If the V
low after tres_f
internally driven from the V
and then becomes highly resistant.
The implemented undervoltage delay keeps NRES low for t
nominal value.
A low-side driver with internal current limitation and thermal shutdown as well as an internal
pull-up resistor according to LIN specification 2.0 is implemented. The voltage range is from
–27V to +40V. This pin exhibits no reverse current from the LIN bus to V
GND shift or V
col specification.
The fall time (from recessive to dominant) and the rise time (from dominant to recessive) are
slope controlled.
CC
voltage falls below the undervoltage detection threshold of V
Batt
(Figure 6-1 on page
S
disconnection. The LIN receiver thresholds are compatible with the LIN proto-
falls below 5V, in order to avoid false bus messages. After switching on V
S
.
S
S
= 5V to 27V. An undervoltage detection is implemented to disable
voltage. If V
11). Even if V
S
voltage ramps down, NRES stays low until V
CC
= 0V the NRES stays low, because it is
ATA6623/ATA6625
Reset
= 4 ms after V
S
thun
, even in the event of a
, NRES switches to
CC
reaches its
S
< 1.5V
thun
.
S
3
,