ATSAM3U-EK Atmel, ATSAM3U-EK Datasheet - Page 1063

• Manufacturer Part Number: ATSAM3U-EK
• Description: KIT EVAL FOR AT91SAM3U CORTEX
• Manufacturer: Atmel
• Type: MCUr

Specifications of ATSAM3U-EK

• Contents: Board
• Processor To Be Evaluated: SAM3U
• Data Bus Width: 32 bit
• Interface Type: RS-232, USB
• Operating Supply Voltage: 3 V
• Silicon Manufacturer: Atmel
• Core Architecture: ARM
• Core Sub-architecture: Cortex - M3
• Silicon Core Number: SAM3U4E
• Silicon Family Name: SAM3U
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT91SAM3U
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

41.5.10
6430D–ATARM–25-Mar-11
ADC12B Timings
When a start conversion request occurs, the ADC12B is automatically activated. As the analog
cell requires a start-up time, the logic waits during this time and starts the conversion on the
enabled channels. When all conversions are complete, the ADC12B is deactivated until the next
trigger. Triggers occurring during the sequence are not taken into account.
The conversion sequencer allows automatic processing with minimum processor intervention
and optimized power consumption. Conversion sequences can be performed periodically using
a Timer/Counter output or a PWM Event line. The periodic acquisition of several samples can be
processed automatically without any intervention of the processor thanks to the PDC.
The conversion sequencer can only be used if all ADC12B inputs have the same input configu-
ration, e.g. same PGA gain, same input type (differential or single ended) and same input offset.
If input have different configurations, sequencer can’t be used because PGA gain, input type
and input offset can’t be changed.
Note:
Each ADC12B has its own minimal Startup Time that is programmed through the field
STARTUP in the Mode Register (ADC12B_MR).
In the same way, a minimal Sample and Hold Time is necessary for the ADC12B to guarantee
the best converted final value between the two channels selection. This time has to be pro-
grammed through the SHTIM bitfield in the Mode Register (ADC12B_MR).
Warning: No input buffer amplifier to isolate the source is included in the ADC12B. This must be
taken into consideration to program a precise value in the SHTIM field. See the section, ADC12B
Characteristics in the product datasheet.
The reference voltage pins always remain connected in normal mode as in sleep mode.
SAM3U Series
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