ATA6613P-PLQW Atmel, ATA6613P-PLQW Datasheet - Page 323

• Manufacturer Part Number: ATA6613P-PLQW
• Description: MCU W/LIN TXRX REG WTCHDG 48-QFN
• Manufacturer: Atmel
• Series: AVR® ATA66 LIN-SBCr

Specifications of ATA6613P-PLQW

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 23
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 48-QFN Exposed Pad
• Processor Series: ATA6x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 1 KB
• Interface Type: I2C, SPI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 23
• Number Of Timers: 3
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6.26
6.26.1
6.26.2
9111H–AUTO–01/11
LIN Re-synchronization Algorithm
Synchronization Algorithm
Precaution Against OSCCAL Discontinuity
The possibility to change the value of OSCCAL during the Oscillator operation allows for
in-situ calibration of the slave node to entering Master frames. The principle of operation is to
measure the TBit during the SYNCH Byte and to change the calibration value of OSCCAL to
recover from local frequency drifts due to local voltage or temperature deviation. The algorithm
used for the synchronization of the internal RC oscillator is depicted in
Figure 6-130. Dichotomic Algorithm Used for LIN Slave Clock Re-synchronization
The
OSCCAL value. For one correct re-synchronization, the frequency change must be kept on
the same side of the discontinuity (no change of OSCCAL[7]). Since there will be no device
having frequency changed by more than 10% (see
to change the frequency value by more than 10%. Therefore, when calibration tries to cross
the border because of subsequent increase (or decrease) in OSCCAL values, then the routine
must be stopped.
Example: For parts operating in the lower part of the curve, if New_OSCCAL >127 then
New_OSCCAL = 127. Similar for parts operating on the high side of the discontinuity.
Figure 7-26 on page 340
Decrement
Increment
OSCCAL
OSCCAL
illustrates the on-purpose discontinuity of RC Frequency versus
-2% < Delta(TBit) < 2%
Delta(TBit) > 2%
Delta(TBit) < -2%
Measuring
actual TBit
Atmel ATA6612/ATA6613
N
N
Figure 7-24 on page
Y
STOP:
Oscillator
Calibrated
Figure
339), thus no reason
6-130.
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