Datasheet

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Analysis Mode

The number of codes used in the calculation is selectable in Configuration mode.

Averaged: In this mode, a number of codes are collected, and the average is calculated. The result can

be displayed in decimal codes or volts. (Hexadecimal is not available because the result may be

fractional.) Volts are calculated as in raw mode.

The number of codes used in the calculation is selectable in Configuration mode.

3.3 Progress Graph

The row of apostrophes at the top of the display are used to indicate measurement progress. In Raw

mode, the apostrophe moves across the display when data is being received from the converter.

In block collection modes, the apostrophes form a bar graph. As the collection of a block proceeds, the

bar graph increases. When the bar graph reaches all the way to the right, the new result is generated and

collection restarts.

3.4 Configuration

To enter Configuration mode, press the PARM buttons simultaneously. The four buttons then assume the

functions shown in the CONFIG box. To exit Configuration mode, press the PARM buttons simultaneously

again. This operation does not cause parameters to be adjusted; only button releases are detected in

Configuration mode.

Configuration mode contains a number of adjustable parameters. To scroll through the available

parameters, use the PARM buttons. To change the parameter values, use the VALUE buttons.

Some items in configuration mode are not parameters, but commands or gateways to a submenu. These

items are labelled as words with a question mark. To enter these items or to execute the command, press

SEL or ENT.

Although a few of the parameters in the Analysis and Scale configuration menus are the same, the

settings are kept separate between the modes.

Table 5 summarizes the available parameters.

Table 5. Parameters in Analysis Mode

Parameter Display Value Range Description

Averages AVG= 2–128 Number of points for average,

peak-to-peak, and RMS modes

Voltage Reference VREF= 0.5–5.0 Voltage used in various

calculations

Power-down mode PDWN? — Power-down mode; see text

Save parameters SAVE? — Save parameters; see text

Version number V1.0.0 — Firmware version number display

3.4.1 Parameters

Averages: Number of points to use in Averaged, RMS noise, and Peak-Peak calculations. The choices

available are 2, 4, 8, 10, 16, 32, 50, 64, and 128. The default setting is 50.

Voltage reference: To convert voltages to codes, the ADS1x31REF requires the voltage reference level.

Since this level cannot be measured, it must be selected manually. This parameter allows the reference

level to be set.

Each digit of the voltage reference is selected and adjusted separately. Use the PARM buttons to select a

digit, and the VALUE buttons to adjust it. The selected digit flashes.

This parameter does not affect the actual voltage reference used. If it is incorrect, voltage calculations will

be wrong. The voltage reference is typically the +5V rail; the default value for this parameter is 5.0V.

SBAU175A–July 2010–Revised August 2011 ADS1131REF and ADS1231REF

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