ATA6613-EK Atmel, ATA6613-EK Datasheet - Page 53

• 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

6.6.3
9111H–AUTO–01/11
Low Power Crystal Oscillator
Table 6-5.
Main purpose of the delay is to keep the AVR
The delay will not monitor the actual voltage and it will be required to select a delay longer
than the V
should be used. A BOD circuit will ensure sufficient V
time-out delay can be disabled. Disabling the time-out delay without utilizing a Brown-Out
Detection circuit is not recommended.
The oscillator is required to oscillate for a minimum number of cycles before the clock is con-
sidered stable. An internal ripple counter monitors the oscillator output clock, and keeps the
internal reset active for a given number of clock cycles. The reset is then released and the
device will start to execute. The recommended oscillator start-up time is dependent on the
clock type, and varies from 6 cycles for an externally applied clock to 32K cycles for a low fre-
quency crystal.
The start-up sequence for the clock includes both the time-out delay and the start-up time
when the device starts up from reset. When starting up from Power-save or Power-down
mode, V
Pins XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier which can
be configured for use as an On-chip Oscillator, as shown in
or a ceramic resonator may be used.
This Crystal Oscillator is a low power oscillator, with reduced voltage swing on the XTAL2 out-
put. It gives the lowest power consumption, but is not capable of driving other clock inputs, and
may be more susceptible to noise in noisy environments. In these cases, refer to the
Swing Crystal Oscillator” on page
C1 and C2 should always be equal for both crystals and resonators. The optimal value of the
capacitors depends on the crystal or resonator in use, the amount of stray capacitance, and
the electromagnetic noise of the environment. Some initial guidelines for choosing capacitors
for use with crystals are given in
values given by the manufacturer should be used.
Figure 6-12. Crystal Oscillator Connections
The Low Power Oscillator can operate in three different modes, each optimized for a specific
frequency range. The operating mode is selected by the fuses CKSEL3..1 as shown in
6-6 on page
Typ Time-out (V
CC
CC
is assumed to be at a sufficient level and only the start-up time is included.
54.
rise time. If this is not possible, an internal or external Brown-Out Detection circuit
4.1ms
65ms
0ms
Number of Watchdog Oscillator Cycles
CC
= 5.0V)
Table 6-6 on page
55.
Typ Time-out (V
C2
C1
Atmel ATA6612/ATA6613
®
4.3ms
69ms
0ms
in reset until it is supplied with minimum V
CC
54. For ceramic resonators, the capacitor
CC
XTAL2
XTAL1
GND
= 3.0V)
before it releases the reset, and the
Figure
6-12. Either a quartz crystal
Number of Cycles
4K (4,096)
8K (8,192)
0
Table
“Full
CC
53
.