CMPSS Digital Filter trip

Table of Contents

• Introduction
• External Connections
  • AM263PX-CC E2
  • AM263X-CC E2
  • AM263PX-LP or AM263X-LP
• Supported Combinations
• Steps to Run the Example
• See Also
• Sample Output

Introduction

A CMPSS example that enables the CMPSS High comparator and feeds the digital filter output to GPIO/OUTPUTXBAR pin

This example enables the CMPSSA1 COMPH comparator and feeds the digital filter CTRIPH signal to the OUTPUTXBAR pin.

Block diagram

CMPIN1P is used to give positive input and internal DAC is configured to provide the negative input. Internal DAC is configured to provide a signal at VDD/2. A Digital Filter signal is generated and is configured to be tripped by CTRIPOUTH.

When a low input(VSS) is provided to CMPIN1P,

• Trip signal(OUTPUTXBAR) output is low

When a high input(higher than VDD/2) is provided to CMPIN1P,

• Trip signal(OUTPUTXBAR) output turns high

External Connections

• OUTPUTXBAR can be connected to an oscilloscope to view the Digital Filter Output.
• For External Voltage (Input to CMPIN1P), we can use the Dac Output as well (Here we generate a sine wave at DAC_OUT)

AM263PX-CC E2

• Give input on CMPIN1P (ADC0_AIN2 - HSEC Pin 15)
• Outputs can be observed on OUTPUTXBAR8 (HSEC Pin 85)
• For DAC loop back as input, connect DAC_OUT (HSEC Pin 9) to CMPIN1P

AM263X-CC E2

• Give input on CMPIN1P (ADC0_AIN2 - HSEC Pin 15)
• Outputs can be observed on OUTPUTXBAR0 (HSEC Pin 81)
• For DAC loop back as input, connect DAC_OUT (HSEC Pin 9) to CMPIN1P

AM263PX-LP or AM263X-LP

• Give input on CMPIN1P (Pin j7.66)
• Outputs can be observed on OUTPUTXBAR8 (j5.50)
• For DAC loop back as input, connect DAC_OUT (J3.30) to CMPIN1P

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 nortos
Toolchain	ti-arm-clang
Boards	am263x-cc, am263x-lp
Example folder	examples/drivers/cmpss/cmpss_digital_filter_trip/

Steps to Run the Example

• When using CCS projects to build, import the CCS project for the required combination and build it using the CCS project menu (see Using SDK with CCS Projects).
• When using makefiles to build, note the required combination and build using make command (see Using SDK with Makefiles)
• Establish connections as mentioned in External Connections section
• Launch a CCS debug session and run the executable, see CCS Launch, Load and Run
• When a low input is provided, Trip signal output is low
• When a high input(higher than VDD/2) is provided, Trip signal output turns high

See Also

CMPSS

Sample Output

Shown below is a sample output when the application is run,

Output Waveform