Software
19
SLDU031 – December 2017
Copyright © 2017, Texas Instruments Incorporated
PGAxxxEVM-037 Pressure Sensor Signal Conditioner Evaluation Module
4.7.1
DAC Loopback Diagnostics Section
The
DAC Loopback Diagnostics
section allows the user to ensure proper signal chain operation by
reading the DAC output through the ADC. With the feedback loop enabled, the user can set a DAC value,
and then read the resulting ADC value on the
Data Monitor
page (see
) to check for
agreement.
4.7.2
Sensor Connectivity Diagnostic Resistors Section
The
Sensor Connectivity Diagnostic Resistors
section allows the user to enable the sensor diagnostic
resistors to monitor short and open conditions on the sensor input pins. The output of these diagnostics is
available in the
Fault Status
tab of the tool panel to the right under the AFE Diagnostics Section. Short
and open conditions can be determined using the VINTP, VINTN, VINPP, and VINPN undervoltage and
overvoltage fault status bits in combination with the internal pulldown resistors.
4.8
SENT Interface Page (PGA 904 Only)
The
SENT Interface
page (see
) allows the user to control SENT settings, and to test
communication on both the fast and slow communication channels.
Figure 14. SENT Interface Page
Data length controls the number of fast data
Nibbles
(4 bits) that will be sent within each transmission, and
the
Tick
period determines the overall speed of the data output.
