ATA6612P-PLPW Atmel, ATA6612P-PLPW Datasheet - Page 323
ATA6612P-PLPW
Manufacturer Part Number
ATA6612P-PLPW
Description
MCU W/LIN TXRX REG WTCHDG 48-QFN
Manufacturer
Atmel
Series
AVR® ATA66 LIN-SBCr
Datasheet
1.ATA6612-EK.pdf
(364 pages)
Specifications of ATA6612P-PLPW
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
8KB (8K 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
SPI, TWI, 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
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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.
323
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