LM3S9B81 Datasheet, PDF(498/1155 Page) Texas Instruments – Stellaris® LM3S9B81 Microcontroller

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LM3S9B81 Datasheet, PDF (498/1155 Pages) Texas Instruments – Stellaris® LM3S9B81 Microcontroller

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Analog-to-Digital Converter (ADC)

13.2

Signal Description

Table 13-1 on page 498 and Table 13-2 on page 498 list the external signals of the ADC module and

describe the function of each. The ADC signals are analog functions for some GPIO signals. The

column in the table below titled "Pin Mux/Pin Assignment" lists the GPIO pin placement for the ADC

signals. Note that when a pin is used as an ADC input, the appropriate bit in the GPIO Analog Mode

Select (GPIOAMSEL) register must be set to disable the analog isolation circuit, and the appropriate

bit in the GPIO Digital Enable (GPIODEN) register must be clear to disable digital function. For

more information on configuring GPIOs, see âGeneral-Purpose Input/Outputs (GPIOs)â on page 294.

Table 13-1. Signals for ADC (100LQFP)

Pin Name

Pin Number Pin Mux / Pin Pin Type Buffer Typea Description

Assignment

AIN0

1

PE7

I

Analog Analog-to-digital converter input 0.

AIN1

2

PE6

I

Analog Analog-to-digital converter input 1.

AIN2

5

PE5

I

Analog Analog-to-digital converter input 2.

AIN3

6

PE4

I

Analog Analog-to-digital converter input 3.

AIN4

100

PD7

I

Analog Analog-to-digital converter input 4.

AIN5

99

PD6

I

Analog Analog-to-digital converter input 5.

AIN6

98

PD5

I

Analog Analog-to-digital converter input 6.

AIN7

97

PD4

I

Analog Analog-to-digital converter input 7.

AIN8

96

PE3

I

Analog Analog-to-digital converter input 8.

AIN9

95

PE2

I

Analog Analog-to-digital converter input 9.

AIN10

92

PB4

I

Analog Analog-to-digital converter input 10.

AIN11

91

PB5

I

Analog Analog-to-digital converter input 11.

AIN12

13

PD3

I

Analog Analog-to-digital converter input 12.

AIN13

12

PD2

I

Analog Analog-to-digital converter input 13.

AIN14

11

PD1

I

Analog Analog-to-digital converter input 14.

AIN15

10

PD0

I

Analog Analog-to-digital converter input 15.

VREFA

90

PB6

I

Analog This input provides a reference voltage used to

specify the input voltage at which the ADC converts

to a maximum value. In other words, the voltage

that is applied to VREFA is the voltage with which

an AINn signal is converted to 1023. The VREFA

input is limited to the range specified in Table

25-2 on page 1082.

a. The TTL designation indicates the pin has TTL-compatible voltage levels.

Table 13-2. Signals for ADC (108BGA)

Pin Name

AIN0

AIN1

AIN2

AIN3

AIN4

AIN5

AIN6

Pin Number Pin Mux / Pin

Assignment

B1

PE7

A1

PE6

B3

PE5

B2

PE4

A2

PD7

A3

PD6

C6

PD5

Pin Type

I

I

I

I

I

I

I

Buffer Typea Description

Analog

Analog

Analog

Analog

Analog

Analog

Analog

Analog-to-digital converter input 0.

Analog-to-digital converter input 1.

Analog-to-digital converter input 2.

Analog-to-digital converter input 3.

Analog-to-digital converter input 4.

Analog-to-digital converter input 5.

Analog-to-digital converter input 6.

498

June 29, 2010

Texas Instruments-Advance Information

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