SAM3U2C Atmel Corporation, SAM3U2C Datasheet - Page 1131

• Manufacturer Part Number: SAM3U2C
• Manufacturer: Atmel Corporation

Specifications of SAM3U2C

• Flash (kbytes): 128 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 96 MHz
• Cpu: Cortex-M3
• # Of Touch Channels: 28
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 57
• Ext Interrupts: 57
• Usb Transceiver: 1
• Quadrature Decoder Channels: 1
• Usb Speed: Hi-Speed
• Usb Interface: Device
• Spi: 4
• Twi (i2c): 1
• Uart: 4
• Ssc: 1
• Sd / Emmc: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 12
• Adc Speed (ksps): 384
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 36
• Self Program Memory: YES
• External Bus Interface: 1
• Dram Memory: No
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 1.62 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 3
• Output Compare Channels: 3
• Input Capture Channels: 3
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

43.7.1
43.7.2
Table 43-37. Analog Inputs
Note:
43.7.3
6430E–ATARM–29-Aug-11
Parameter
Input Voltage Range
Input Leakage Current
Input Capacitance
1. Input Voltage range can be up to VDDANA without destruction or over-consumption.
2. If VDDIO < V
Gain and Offset Calibration
Sample and Hold Time versus Source Output Impedance
ADC Application Information
ADVREF
The user can correct the gain and offset errors by calibration. The calibration values (for gain
and offset) have been stored in the Flash during test for the mode single ended with gain =1.
The calibration values are stored after the Unique Identifier. The Offset value register is next
after the Unique Identifier, at the address 0x80010, and the Gain calibration is at the address
0x80014. Refer to the Unique Identifier section to know how to enter into the Unique Identifier
mode.
For more information on how to use these calibration values, refer to the Application note "Ana-
log-to-Digital Converter in the SAM3S" chapter "ADC calibration".
The following figure gives a simplified acquisition path.
Figure 43-10. Simplified Acquisition Path
The user can drive ADC input with impedance of Zsource up to:
with SHTIM (Sample and Hold Time register) expressed in ns and Z
Note:
For more information on data converter terminology, please refer to the application note:
Data Converter Terminology, Atmel lit° 6022.
http://www.atmel.com/dyn/resources/prod_documents/doc6022.pdf
• In 10-bit mode: SHTIM = 0.042 x Zsource + 160
• In 12-bit mode: SHTIM= 0.054 x Zsource + 205
, max input voltage is VDDIO.
Csample and Ron are taken into account in the formulas
Zsource
Input
ADC
Mux.
Ron
Sample & Hold
Csample
Min
0
Typ
SOURCE
SAM3U Series
12-bit
ADC
Core
V
expressed in ohms.
AD12BVREF
Max
±0.5
14
Units
μA
pF
1131