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cadc_expansion_mux_aux_opamp_err051396

cadc_expansion_mux_aux_opamp_err051396#

Overview#

The CADC expansion mux aux OPAMP errata err051396 application demonstrates when ADC mux aux circle may stop by failure, and how to apply the workaround to fix it. This application is based on CADC expansion mux aux OPAMP application, please refer to it for additional information. The difference is that the OPAMPA/B output is connected to ADCA/B within chip without board external wire connections. The ADC mux aux scan mode is changed to scan mode 2: The sample completion of either ANA4/ANB4 or ADCA/ADCB on-chip analog signal enables subsequent selected channel.

In this application, the scan sequence is defined as: [A7 A0 A0 B7 A0 A0 B7 A0 A0 A7 A0 A0 B7 A0 A0 A7] After 3 rounds of scan, the ADC mux aux circle for ADCB stops, and will not continue. This makes the measurement on ADCB (value1 in promped message) not change again. By applying workaround, the above error is fixed, and ADC mux aux circle for ADCB continues normally. For more details on err051396, please check errata document.

Supported Boards#

MC56F80000-EVK
Hardware requirements

  • Micro USB cable

  • MC56F80000-EVK board

  • Personal Computer

Board hardware common setting

  1. Power setting:

    Connect J8 pin2 and pin3 Connect J6 pin1 and pin2 Connect J5 pin1 and pin2

  2. Reset pin setting:

    Connect J11 pin2 and pin3

  3. Debugger setting:

    Connect J13 pin 1-2, 3-4, 5-6, 7-8

Board settings

Remove jumpers J20, J15, J16, J24, J25. Connect 0.3V DC voltage to J20-2. (GPIOA1 for OPAMPA CH0 input signal) Connect 0.3V DC voltage to J25-2. (GPIOB0 for OPAMPB CH3 input signal) Connect J24-2 to ground like J3-14. (GPIOA0 for ADC ANA0 input signal, used for ADC timeslots for stabilize OPAMP)

Prepare the Demo

  1. Connect USB cable between the host PC and the USB(J12) port on the target baord to setup mulitlink debugger.

  2. Open a serial terminal with the following settings:

    • 115200 baud rate

    • 8 data bits

    • No parity

    • One stop bit

    • No flow control

  3. Download the program to the target board with PnE U-MultiLink debug configuration.

  4. Either press the reset button on your board or launch the debugger in your IDE to begin running the demo. Please be noted default FCF(flash configuration field) makes the MCU boot from flash.

Running the demo

Run the demo, and the user is requested to input choices for run with or without errata workaround. 0-without workaround (failing to switch mux channel forward); 1-with workaround (succeed to switch mux channel forward); Other inputs will be ignored.

If choose ‘0’ without workaround, the message is like below. The ADC value1 will not change much after 3 rounds. ADC Value: 3016 ADC Value1: 3056 ——— check if this value stay within small range or not ADC Value: 24040 ADC Value1: 24056 ——— check if this value stay within small range or not ADC Value: 12000 ADC Value1: 12040 ——— check if this value stay within small range or not ADC Value: 3016 ADC Value1: 3064 ——— check if this value stay within small range or not ADC Value: 23992 ADC Value1: 3056 ——— check if this value stay within small range or not ADC Value: 11984 ADC Value1: 3056 ——— check if this value stay within small range or not ADC Value: 3008 ADC Value1: 3048 ——— check if this value stay within small range or not ADC Value: 24008 ADC Value1: 3048 ——— check if this value stay within small range or not ADC Value: 11984 ADC Value1: 3056 ——— check if this value stay within small range or not ADC Value: 3000 ADC Value1: 3048 ——— check if this value stay within small range or not ADC Value: 24000 ADC Value1: 3056 ——— check if this value stay within small range or not ADC Value: 11992 ADC Value1: 3056 ——— check if this value stay within small range or not ADC Value: 3008 ADC Value1: 3056 ——— check if this value stay within small range or not ADC Value: 23984 ADC Value1: 3048 ——— check if this value stay within small range or not ADC Value: 11976 ADC Value1: 3056 ——— check if this value stay within small range or not ADC Value: 3008 ADC Value1: 3056 ——— check if this value stay within small range or not

If choose ‘1’ with workaround, the message is like below. The ADC value1 will change to different range for all rounds. ADC Value: 3008 ADC Value1: 3048 ——— check if this value stay within small range or not ADC Value: 24064 ADC Value1: 24080 ——— check if this value stay within small range or not ADC Value: 11984 ADC Value1: 12040 ——— check if this value stay within small range or not ADC Value: 3016 ADC Value1: 3056 ——— check if this value stay within small range or not ADC Value: 23992 ADC Value1: 24008 ——— check if this value stay within small range or not ADC Value: 11984 ADC Value1: 12040 ——— check if this value stay within small range or not ADC Value: 3016 ADC Value1: 3056 ——— check if this value stay within small range or not ADC Value: 24024 ADC Value1: 24040 ——— check if this value stay within small range or not ADC Value: 11992 ADC Value1: 12032 ——— check if this value stay within small range or not ADC Value: 3016 ADC Value1: 3056 ——— check if this value stay within small range or not ADC Value: 24000 ADC Value1: 24024 ——— check if this value stay within small range or not ADC Value: 12008 ADC Value1: 12040 ——— check if this value stay within small range or not ADC Value: 3024 ADC Value1: 3056 ——— check if this value stay within small range or not ADC Value: 23992 ADC Value1: 24016 ——— check if this value stay within small range or not ADC Value: 11992 ADC Value1: 12032 ——— check if this value stay within small range or not ADC Value: 3008 ADC Value1: 3048 ——— check if this value stay within small range or not

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