MAX11040DBEVKIT Просмотр технического описания (PDF) - Maxim Integrated

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MAX11040DBEVKIT

MAX11040 Evaluation Kit/Daughterboard

Maxim Integrated 

MAX11040 Evaluation Kit/Daughterboard

Detailed Description of Software

The MAX11040 EV kit’s main window is shown in Figure

1. The Setup group box, located at the top of the win-

dow, contains Configuration, Sampling Instant

Control, and Output Data Rate Control group boxes.

Functions related to reading single-sample ADC values

in the ADC Conversion group box are located in the

middle section. Data-logging functions and data calcu-

lation are in the Data Logging group box, located at

the bottom of the main window.

Up to five devices can be cascaded by using the

daughterboards. Select the number of cascaded ICs

from the Number of Devices menu item.

Setup

All the settings in the Setup group box correspond to

the registers of the IC specified in the IC Selection

drop-down list. In the IC Selection drop-down list,

MAX11040 IC #1 and MAX11040 IC #2 represent the

ICs (U1 and U2) on the EV kit. MAX11040 IC #3,

MAX11040 IC #4, and MAX11040 IC #5 represent the

ICs on the optionally cascaded daughterboards.

When the EV kit software starts up, or when a different

IC is selected in the IC Selection drop-down list, the

Configuration, Sampling Instant Control, and Output

Data Rate Control group boxes display the content of

the IC specified in the IC Selection drop-down list.

Configuration

In the Configuration group box, the user can change

the value of the configuration register in the selected IC.

Each checkbox in the Configuration group box corre-

sponds to a bit in the configuration register. Click on

the checkbox to toggle each bit.

Sampling Instant Control

Adjust the appropriate scrollbars in the Sampling

Instant Control group box to set the sampling instant

delay for the input channels.

Output Data Rate Control

There are three panels in the Output Data Rate

Control group box, and each one of them has a differ-

ent way to set up the data rate of the IC. The user can

select one of them by checking the corresponding

radio button on the left of the panel.

To set the sample rate by directly controlling the ADC’s

register (coarse adjust and fine adjust), use the first

panel at the top of the Output Data Rate Control

group box. Select the coarse-adjusted output-data rate

in the Coarse Adjust drop-down list, and adjust the

Fine Adjust scrollbar to set up the output data rate.

The Coarse Adjust drop-down list and the Fine Adjust

scrollbar correspond to the output data rate coarse

adjust register and the output data rate fine adjust reg-

ister, respectively. The actual data rate is displayed in

the Actual Data Rate label.

To set the sample rate by entering a desired sample

rate, and letting the EV kit software calculate the clos-

est possible sample rate, use the Request Data Rate

edit box. Enter the desired data rate into the Request

Data Rate edit box and press the enter key. The pro-

gram sets up the closest possible data rate automati-

cally. The actual data rate is displayed in the Actual

Data Rate label.

To set the sample rate by letting the software detect the

input frequency, and adjust the sample rate to a

desired number of samples per cycle, use the Auto

Adjust Sample Rate group box. The software detects

the frequency of the input signal on any channel select-

ed in the drop-down list. Set up the data rate based on

how many samples per input-signal cycle was request-

ed in the Samples/Cycle edit box. The actual data rate

is displayed in the Actual Data Rate label.

ADC Conversion

The ADC Value Display group box, shown in the ADC

Conversion group box, displays the output data codes

and the calculated voltage values for a single sample

of all of the channels on the IC specified in the IC

Selection drop-down list. Pressing the Convert button

in the ADC Conversion group box updates the status

of the ADC Value Display group box.

Check the Auto Convert checkbox to automatically

and repeatedly read the current ADC value at a rate set

by the Time Interval drop-down list.

Data Logging

Start Conversion

The Data Logging group box is located at the bottom

of the window. The user can select the desired number

of conversions in the Number of Samples drop-down

list. Press the Start Conversion button in the Data

Logging group box to start sampling at the rate that

was set by the Output Data Rate Control group box.

Output File Data

The Save to File button is not active until the sampling

is done. After sampling is finished, and before pressing

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