LM3S1651 Datasheet, PDF (56/1033 Pages) Texas Instruments – ARM and Thumb are registered trademarks and Cortex is a trademark

Architectural Overview
1.3.6
1.3.6.1
Analog
The LM3S1651 microcontroller provides analog functions integrated into the device, including:
■ Two 10-bit Analog-to-Digital Converters (ADC) with 16 analog input channels and a sample rate
of one million samples/second
■ Two analog comparators
■ 16 digital comparators
■ On-chip voltage regulator
The following provides more detail on these analog functions.
ADC (see page 533)
An analog-to-digital converter (ADC) is a peripheral that converts a continuous analog voltage to a
discrete digital number. The Stellaris ADC module features 10-bit conversion resolution and supports
16 input channels plus an internal temperature sensor. Four buffered sample sequencers allow
rapid sampling of up to 16 analog input sources without controller intervention. Each sample
sequencer provides flexible programming with fully configurable input source, trigger events, interrupt
generation, and sequencer priority. Each ADC module has a digital comparator function that allows
the conversion value to be diverted to a comparison unit that provides eight digital comparators.
The LM3S1651 microcontroller provides two ADC modules with the following features:
■ 16 shared analog input channels
■ Single-ended and differential-input configurations
■ On-chip internal temperature sensor
■ Maximum sample rate of one million samples/second
■ Optional phase shift in sample time programmable from 22.5º to 337.5º
■ Four programmable sample conversion sequencers from one to eight entries long, with
corresponding conversion result FIFOs
■ Flexible trigger control
– Controller (software)
– Timers
– Analog Comparators
– PWM
– GPIO
■ Hardware averaging of up to 64 samples
■ Digital comparison unit providing eight digital comparators
■ Converter uses an internal 3-V reference or an external reference
56
January 21, 2012
Texas Instruments-Production Data