How can I read analog COS and SIN voltages with LAUNCHXL-F28069M?

조회 수: 5 (최근 30일)
Nils
Nils 2022년 12월 21일
댓글: Johan Lecoutere 2024년 11월 12일 13:19
I am trying to excite and evaluate a resolver with a Launchpad F28069M in combination with the TMDSRSLVR C2000 Resolver to Digital Conversion Kit.
I am targeting the set up / hardware connection described in:
https://de.mathworks.com/help/supportpkg/texasinstrumentsc2000/ug/hardware-connections-c2000.html
I am facing the following problem: I want to read in the SIN and COS voltages using the ADC. Apparently, the voltages received are in the range of +/- 0.5V while the ADC voltage range is 0-3V. Hence, the digital signals are cut off at "0" so that proper angle/speed calculation is not possible. The example simulink model shown in
https://de.mathworks.com/help/mcb/gs/monitoring-resolver-using-serial-communication.html?searchHighlight=monitor%20resolver&s_tid=srchtitle_monitor%20resolver_1
implies that the resolver evaluation is possible. Can anyone help me, how proper COS/SIN reading can be achieved?
Many thanks
Nils

답변 (1개)

Mukul Choudhury
Mukul Choudhury 2023년 8월 9일
편집: Mukul Choudhury 2023년 8월 9일
Hi,
The example mentioned by you uses the TI TMDSRSLVR - Resolver EVM kit. This resolver uses a level shifter and a gain amplifier using Texas Instruments TLV2772 to fit the reolver signals within the ADC range.
Due to the level shifter, the reolver signals which are fed to the ADC are in the ramge of 0- 3.3 V.
Please refer to the following lik for more details:
Hope this helps.
Regards,
Mukul
  댓글 수: 1
Johan Lecoutere
Johan Lecoutere 2024년 11월 12일 13:19
Would it be possible to use one ADC to measure the positive part and another for the negative part of the signal? Then combine the two?

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