Code Example
©
2011 Microchip Technology Inc.
DS51994A-page 13
FIGURE 2-2:
MCP3903 Data View Software - Main Screen.
Connectivity is done through the serial port. First, the user must identify the com port
number from
My computer
>
Manage
>
Device Manager
. After this, in “VISA resource
names”, users must find and select the correct com port number. Only after this, can
the START button be pressed to begin the data acquisition.
FIGURE 2-3:
MCP3903 Data View Software - Registers and Settings Screen.
From the
Edit
menu, the user can open the
Registers and Settings
window to control
the internal registers of the MCP3903, the sampling speed of the ADC or if any
averaging should be done on the acquired samples.
From the buffer length, the user can select the amount of data that will be processed.
The maximum length is 512. From the Sampling Speed Control, the user can change
the sampling speed of the ADC. By writing a lower value, the sampling speed is
increased, and for higher values it is decreased. The accurate value of the sampling
speed is indicated in the Sampling speed indicator.
If the user wants to investigate the effect of averaging on the performance indicator, the
desired value can be written in the “Averages” control. It must be noted that the
processed buffer will decrease by a factor equal to the value of the average.
The
Write Register
and
Read Registe
r tabs are used to set the internal registers of
the MCP3903. With the
Write Register
tab they are written and with the
Read
Register
tab, the user can check the settings of the registers.
