Texas Instruments ADS1232REF, Руководство пользователя, Страница: 11 / 30

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Analysis Mode
3 Analysis Mode
In Analysis mode, the ADS1232REF analyzes code output from the ADS1232 and displays it in different
ways.
Table 3 summarizes the numerous display modes available, together with example displays.
Table 3. Modes and Example Displays
HEX CODE DEC CODE VOLTAGE ENOB
Raw 1992E9H +1676001 +499.488M n/a
RMS n/a +5.789 +17.495N +23.18BIT
Peak-to-Peak n/a +31.256 +90.293N +21.92BIT
Averaged n/a +1676001 +499.488M n/a
The ADS1232REF operates in Analysis mode when the mode switch is set to the ANALYSIS position.
The default Analysis mode is RAW HEX.
To change measurement types, hold down DISP and press UNIT. This function cycles through the four
available measurement types. When DISP is released, the newly selected measurement is made. To
change units, press MODE. This option cycles through the available units for the active measurement
type. This procedure can also be done while DISP is depressed; in that case, the new unit is shown by
name on the display. The measurement modes are described in detail in
Section 3.2 .
The ADS1232 itself can be configured directly from this mode, as described in Section 3.1 .
3.1 Switch Functions
UNIT: Pressing this switch resets the collection process for the RMS, peak-to-peak, and averaged
measurements.
MODE: Cycles between available units. Not all units are available in all modes.
DISP: When this switch is pressed, the display shows the current measurement mode and unit. While
DISP is still pressed, pressing UNIT cycles through the available measurement modes.
CHIP: Holding this switch down allows the settings of the ADS1232 to be changed, using the VALUE,
(ENT) and (SEL) buttons.
Pressing ENT while CHIP is pressed down cycles through the available parameters — gain, data rate, and
active channel.
The gain setting is displayed as
GAIN=
followed by the gain setting. Gains of 1, 2, 64 and 128 are
available.
Data rate is shown on the display as
SPD=FAST
or
SPD=SLOW
. See ADC speed in the Parameters section
for further information.
Channel information is shown as Channel followed by the active channel number (1, 2, or TEMP if
measuring the temperature diode voltage).
If any of these parameters are changed during a multisample measurement, the measurement is
restarted.
3.2 Measurement Modes
Raw: In this measurement, codes are read from the ADS1232 and displayed. No processing or analysis is
done on the sample stream. Data can be displayed as hexadecimal codes, decimal codes, or volts.
Voltage is calculated according to Equation 3 :
Where:
•
A is the converter gain (1, 2, 64, or 128), determined from the programmed gain setting
• v
REF
is the voltage at the converter reference input
•
x is the ADC decimal code (3)
11 SBAU120B – November 2005 – Revised July 2011 ADS1232REF User ' s Guide
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