ATA6834 ATMEL Corporation, ATA6834 Datasheet - Page 12

• Manufacturer Part Number: ATA6834
• Description: (ATA6833 / ATA6834) BLDC Motor Driver and LIN System Basis Chip
• Manufacturer: ATMEL Corporation

3.10
3.11
12
LIN Transceiver
Diagnostic Outputs D1 - D3
ATA6833/ATA6834 [Preliminary]
As mentioned in the sections above, the diagnostic outputs DG1 to DG3 are used to signal fail-
ures. This is summarized in the following table.
Table 3-2.
In order to differentiate between LIN and EN2 wake-up, DG1 output will be set to LOW or HIGH
respectively. LOW indicates wake-up by LIN, HIGH indicates wake-up by EN2. DG1 output will
be cleared by the first valid watchdog trigger after wake-up or by the first rising edge at one of
the control inputs (IL1 to IL3 and IH1 toIH3) if the watchdog is disabled.
Table 3-3.
ATA6833 and ATA6834 include a fully integrated LIN transceiver complying with LIN specifica-
tion 2.1 and SAEJ2602 2. The transceiver consists of a low-side driver with slew rate control,
wave shaping, current limiting, and a high voltage comparator followed by a debouncing unit in
the receiver.
During transmission, the data applied at pin TXD will be transferred to the bus driver to generate
a bus signal on LIN pin. TXD input has an internal pull-up resistor.
To minimize the electromagnetic emission of the bus line, the bus driver has a built-in slew rate
control and wave-shaping unit. The transmission will be aborted by a thermal shutdown or by a
transition to Sleep Mode.
Note:
CPOK
X
X
X
X
0
DG1
1
0
X represents: no effect)
OT1: overtemperature warning
OV: overvoltage of PBAT
UV: undervoltage of PBAT
SC: short circuit
CPOK: charge pump OK
OT1
X
1
X
X
X
Device Status
Diagnostic Outputs
Status of the Diagnostic Outputs (Normal Operation)
Indicating Wake-up Source
OV
X
X
X
X
1
DG2
–
–
UV
X
X
X
X
1
SC
X
X
X
X
1
DG3
–
–
DG1
–
–
–
1
–
Diagnostic Outputs
DG2
1
–
1
1
–
DG3
–
1
–
–
–
Wake-up Source
Overtemperature prewarning
EN2
w w w . D a t a S h e e t
LIN
Charge pump failure
Undervoltage
Overvoltage
Short circuit
Comments
9122D–AUTO–09/09