LM3S613 Datasheet, PDF (332/591 Pages) List of Unclassifed Manufacturers – Microcontroller

Analog-to-Digital Converter (ADC)
Figure 10-1. ADC Module Block Diagram
Trigger Events
Comparator
GPIO (PB4)
Timer
SS3
PWM
Comparator
GPIO (PB4)
Timer
SS2
PWM
Comparator
GPIO (PB4)
Timer
SS1
PWM
Comparator
GPIO (PB4)
Timer
SS0
PWM
SS0 Interrupt
SS1 Interrupt
SS2 Interrupt
SS3 Interrupt
ADCEMUX
ADCPSSI
Control/Status
ADCACTSS
ADCOSTAT
ADCUSTAT
ADCSSPRI
Interrupt Control
ADCIM
ADCRIS
ADCISC
Sample
Sequencer 0
ADCSSMUX0
ADCSSCTL0
ADCSSFSTAT0
Sample
Sequencer 1
ADCSSMUX1
ADCSSCTL1
ADCSSFSTAT1
Sample
Sequencer 2
ADCSSMUX2
ADCSSCTL2
ADCSSFSTAT2
Sample
Sequencer 3
ADCSSMUX3
ADCSSCTL3
ADCSSFSTAT3
Analog-to-Digital
Converter
Hardware Averager
ADCSAC
FIFO Block
ADCSSFIFO0
ADCSSFIFO1
ADCSSFIFO2
ADCSSFIFO3
Analog Inputs
10.2
Signal Description
The signals are analog functions for some GPIO signals. The column in the table below titled "Pin
Assignment" lists the GPIO pin placement for the ADC signals. The AINx analog signals are not
5-V tolerant and go through an isolation circuit before reaching their circuitry. These signals are
configured by clearing the corresponding DEN bit in the GPIO Digital Enable (GPIODEN) register.
For more information on configuring GPIOs, see “General-Purpose Input/Outputs
(GPIOs)” on page 230.
Table 10-1. ADC Signals (48QFP)
Pin Name
Pin Number Pin Type Buffer Type^a Description
ADC0
1
I
Analog Analog-to-digital converter input 0.
ADC1
2
I
Analog Analog-to-digital converter input 1.
ADC2
3
I
Analog Analog-to-digital converter input 2.
ADC3
4
I
Analog Analog-to-digital converter input 3.
a. The TTL designation indicates the pin has TTL-compatible voltage levels.
10.3
Functional Description
The Stellaris ADC collects sample data by using a programmable sequence-based approach instead
of the traditional single or double-sampling approaches found on many ADC modules. Each sample
sequence is a fully programmed series of consecutive (back-to-back) samples, allowing the ADC
to collect data from multiple input sources without having to be re-configured or serviced by the
controller. The programming of each sample in the sample sequence includes parameters such as
the input source and mode (differential versus single-ended input), interrupt generation on sample
completion, and the indicator for the last sample in the sequence.
332
July 14, 2014
Texas Instruments-Production Data