SAM9X25 Atmel Corporation, SAM9X25 Datasheet - Page 838

• Manufacturer Part Number: SAM9X25
• Manufacturer: Atmel Corporation

Specifications of SAM9X25

• Flash (kbytes): 0 Kbytes
• Pin Count: 217
• Max. Operating Frequency: 400 MHz
• Cpu: ARM926
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 105
• Ext Interrupts: 105
• Usb Transceiver: 3
• Usb Speed: Hi-Speed
• Usb Interface: Host, Device
• Spi: 2
• Twi (i2c): 3
• Uart: 7
• Can: 2
• Lin: 4
• Ssc: 1
• Ethernet: 2
• Sd / Emmc: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 10
• Adc Speed (ksps): 440
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 32
• Self Program Memory: NO
• External Bus Interface: 1
• Dram Memory: DDR/LPDDR, SDRAM/LPSDR
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 0.9 to 1.1
• Fpu: No
• Mpu / Mmu: No/Yes
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

838
838
SAM9X25
SAM9X25
The following formula is used to compute the deviation of the slave bit rate relative to the master
bit rate after synchronization (F
F
LIN Standard imposes that it must not exceed ±15%. The LIN Standard imposes also that for
communication between two nodes, their bit rate must not differ by more than ±2%. This means
that the Baudrate_deviation must not exceed ±1%.
It follows from that, a minimum value for the nominal clock frequency:
Examples:
TOL_UNSYNCH
• The Baud Rate
• The oversampling (Over=0 => 16X or Over=0 => 8X)
• Baudrate = 20 kbit/s, Over=0 (Oversampling 16X) => F
• Baudrate = 20 kbit/s, Over=1 (Oversampling 8X) => F
• Baudrate = 1 kbit/s, Over=0 (Oversampling 16X) => F
• Baudrate = 1 kbit/s, Over=1 (Oversampling 8X) => F
F
Baudrate_deviation
Baudrate_deviation
is the deviation of the real slave node clock from the nominal clock frequency. The
NOM
min
=
100
SLAVE
=
=
-------------------------------------------------------------------------------------------------- - Hz
is the real slave node clock frequency).
0.5
100
100
–
0.5
8
---------------------------------------------------------------------------------------------- - %
---------------------------------------------------------------------------------------------- - %
8
2 Over
+0.5
8
8
8
–
–
--------- -
100
15
F
-------------------------------------- - xF
2 Over
2 Over
+
TOL_UNSYNCH
Nom
-1
–
–
1
8
Nom
Nom
+
Nom
(min) = 74 kHz
100
1
(min) = 1.47 MHz
(min) = 132 kHz
F
(min) = 2.64 MHz
1%
SLAVE
+1
+
+
Baudrate
Baudrate
Baudrate
Nom
11054A–ATARM–27-Jul-11
11054A–ATARM–27-Jul-11