ATA6613-EK Atmel, ATA6613-EK Datasheet - Page 5

• 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

9127A–AUTO–05/08
Figure 2-1.
The board’s pre-programmed firmware provides the window watchdog with a valid trigger sig-
nal so that the NRES pin is not forced to ground and the microcontroller does not receive any
resets.
For testing purposes and to understanding the system, it can be helpful to see the behavior
when the watchdog is not triggered correctly. This can be achieved in two different ways with-
out changing the firmware of the IC:
• Remove TRIG jumper
• Re-program the Fuse bit
No trigger signal reaches the watchdog and the watchdog generates a reset directly after
the lead time t
Changing the fuse bit CKDIV8 to un-programmed, changes the microcontroller’s internal
clock from 1 MHz to 8 MHz. Because of this the trigger signals generated from the
microcontroller does not meet the open window from the window watchdog and a reset is
generated.
d
(51k ) = 49 ms has expired.
ATA6612/ATA6613
5