SAM3U2C Atmel Corporation, SAM3U2C Datasheet - Page 1161

• 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

46.2.2
46.2.2.1
46.2.2.2
46.2.3
46.2.3.1
6430E–ATARM–29-Aug-11
12-bit Analog-to-Digital Converter (ADC12B)
Power Management Controller (PMC)
ADC12B: Current Consumption in Backup Mode on VDDANA
ADC12B: Saturation
PMC: Main Oscillator Frequency selection if the Main On-chip RC Oscillator is OFF
In Backup mode, the current consumption on VDDANA is around 1.0 mA instead of 0.1 μA
Four workarounds are possible:
When the ADC12B works in saturation (measurements below 0V or above ADREF) the results
may be erratic, the value deviation can be around 30 LSB to the expected data.
None.
When the 4/8/12 MHz RC Oscillator is off, the frequency selection (MOSCRCF bitfield in
CKGR_MOR) can not be changed. The register can be written but the modification to
MOSCRCF will not be taken into account.
Modify MOSCRCF while 4/8/12 MHz RC Oscillator is on (MOSCREN = 1).
1. Do not supply VDDANA and VDDIO in Backup mode using an external switch managed
2. Do not supply VDDANA in Backup mode using an external switch managed by the
3. Do not supply VDDANA in Backup mode using an external switch managed by any PIO
4. Use wait mode instead of Backup mode.
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
by SHDN pin.
SHDN and set all PIOs with ADC inputs (PA22, PA30, PB3-PB8, PC15-PC18, PC28-
C21) at low level (either externally or by software).
and set all PIOs with ADC inputs (PA22, PA30, PB3-PB8, PC15-PC18, PC28-C21) at
low level (either externally or by software). Since the PIO state is preserved when in
backup mode, any free PIO line can be used to switch off the external switch by driving
the PIO line at low level (PIO is input, pull-up enabled after backup reset).
SAM3U Series
1161