ATA6613-EK Atmel, ATA6613-EK Datasheet - Page 9

• Manufacturer Part Number: ATA6613-EK
• Description: BOARD DEMO LIN-MCM FOR ATA6613
• Manufacturer: Atmel

Specifications of ATA6613-EK

• Main Purpose: Interface, LIN + MCU
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: ATA6613
• Primary Attributes: LIN-SBC (System-Basis-Chip) Transceiver, LIN 2.0, Voltage Regulator, Window Watchdog
• Secondary Attributes: 16 kB Flash, 4 Power Modes: Pre-Normal, Normal, Sleep, Silent, 48-QFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

3.1.5
3.1.6
3.1.7
3.1.8
3.1.9
9127A–AUTO–05/08
INH Pin (LIN SBC)
ADC6 and ADC7 (Microcontroller)
WAKE (LIN SBC)
KL_15 (LIN SBC)
MODE Pin (LIN SBC) and Debug Mode
This output is short-circuit protected.
The TXD-pin from the microcontroller, belonging to the hardware UART, is hard-wired to the
TXD input pin from the LIN SBC via a 0 resistor and the current state of this pin can be mon-
itored at a provided test point.
A 50 mA current supply will be sufficient for most LIN node applications. However, if more cur-
rent is needed, the INH Output can be used to switch an additional, external voltage regulator
on during normal or fail-safe mode. The INH pin is automatically switched off in sleep or silent
mode. In addition to switching an external voltage regulator, the INH output can also be used
to switch application-specific circuit parts in order to minimize current consumption during
sleep or silent mode.
As the ADC6 as well as the ADC7 can only be used for converting analog signals to digital val-
ues, and there is no analog output from the ATA6612 and ATA6613 to measure, these two
input pins have been led off the board in order to be externally connected if required.
The high-voltage input pin WAKE can be used to generate a local low-active wake-up from
sleep mode or silent mode. A push button is provided at this pin on the development board. If
a local wake-up is not required in the application, the WAKE pin should be connected to VS. In
this case the two resistors R6 and R7 need to be replaced by 0 resistors.
There is another opportunity, in addition to the WAKE pin, to generate a local wake-up: the
KL_15 pin. Like the WAKE pin, the KL_15 pin is also a high-voltage input, however, it is edge
sensitive this gets activated on a low-to-high transition. It can be connected to the ignition of
the car in order to generate a local wake-up in the application when the ignition is switched on.
If this wake-up option is not used in an application this pin should be connected directly to
ground.
During the early development phase it can be helpful to deactivate the watchdog so that no
resets disturb the normal application program. It is strongly recommended to use this so-called
Debug Mode only during the development phase as the watchdog is an important safety fea-
ture for the most applications used in automotive environment.
On the development board the MODE pin is pulled to ground via the 10 k resistor R3. There-
fore, the watchdog is active during LIN SBC’s Normal Mode or Pre-normal Mode. By setting
the MODE jumper, the MODE pin is tied to 5V, and the watchdog is disabled. If the watchdog
is disabled, the other reset sources (undervoltage reset and after power-up) remain active. In
order to avoid all resets of the microcontroller during debugging, deactivate the watchdog by
removing the jumpers MODE and NRES.
Please note, if the jumper NRES has been removed and an undervoltage or watchdog failure
occurs, the LIN SBC switches to Pre-normal Mode irrespective of whether the microcontroller
has been reset or not. In this case, the LIN transceiver is deactivated as long as the reset line
is low.
ATA6612/ATA6613
9