Texas Instruments PGA2505 Evaluation Module PGA2505EVM PGA2505EVM Datenbogen
Produktcode
PGA2505EVM
Software Installation and Operation
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If the parallel port configuration is unknown, then click the System Info tab on the upper left corner. The
computer system summary should be displayed; find the parallel port under the Ports section of
Components.
computer system summary should be displayed; find the parallel port under the Ports section of
Components.
The Device panel includes a Clear button, which is used to set the PGA2505 16-bit control word to the
reset default conditions. The default conditions are:
reset default conditions. The default conditions are:
•
DC servo enabled (DC bit set to '0').
•
Common-mode servo disabled (CM bit set to '0').
•
Zero-crossing detector disabled
•
Overload indicator level set to 5.1V
RMS
or 1dB below the output range (OR bit set to '0')
•
General-purpose digital output bits GPO1 through GPO4 are all set to '0'.
•
Gain set to 0dB (gain bits G0 through G5 are all set to '0').
The Soft Mode Control is broken up into two sections. The first section includes check boxes for toggling
the state of the DC servo (DC), common-mode servo (CM), zero-crossing detector (ZC), over-range
indicator (OR), and GPO1 through GPO4 control bits. An empty checkbox sets the state of the
corresponding bit to '0'. Clicking on the checkbox sets the corresponding control bit to '1'. Clicking on the
checkbox again will clear the control bit, setting it to '0'.
the state of the DC servo (DC), common-mode servo (CM), zero-crossing detector (ZC), over-range
indicator (OR), and GPO1 through GPO4 control bits. An empty checkbox sets the state of the
corresponding bit to '0'. Clicking on the checkbox sets the corresponding control bit to '1'. Clicking on the
checkbox again will clear the control bit, setting it to '0'.
The Manual Control section of the PGA2505EVM allows the user to input the control word by toggling the
individual bits of the serial word. In manual control, the bits are toggled and the word is sent after the
Update button is clicked. Note that both the SDI bus data and the manual control display are updated
upon the completion of a write to the PGA2505, regardless of whether it comes from Soft Mode Control or
the Manual Control
individual bits of the serial word. In manual control, the bits are toggled and the word is sent after the
Update button is clicked. Note that both the SDI bus data and the manual control display are updated
upon the completion of a write to the PGA2505, regardless of whether it comes from Soft Mode Control or
the Manual Control
The SDO pin output is provided with a corresponding text display, and may be used to read and display
the control word value in hexadecimal data format. A readback function is provided primarily as a software
and hardware diagnostic function, because it allows the user to determine if the PGA2505 control word is
being programmed correctly. This function can be used to debug hardware and cable connection
problems, or to help identify possible software compatibility issues. In order to readback the last command
sent to the serial interface, clicking the slider without changing the gain will rewrite the last command and
force the last command onto SDO.
the control word value in hexadecimal data format. A readback function is provided primarily as a software
and hardware diagnostic function, because it allows the user to determine if the PGA2505 control word is
being programmed correctly. This function can be used to debug hardware and cable connection
problems, or to help identify possible software compatibility issues. In order to readback the last command
sent to the serial interface, clicking the slider without changing the gain will rewrite the last command and
force the last command onto SDO.
PGA2505EVM
14
SBOU078 – June 2009