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MSP430FR6047: MCU018

Anup Kumar
Prodigy 230 points
Part Number: MSP430FR6047


Tool/software:

Hi,

I am using the TI board with MSP430FR6047 and with flow tube connected to it. The issue is when reference meter is reading constant flow rate say for example 500LPH or 0LPH. TI board is reading 480 LPH fine enough but in between for couple of seconds it starts reading around 10000 LPH. When after analyzing all the parameters it was observed that ADC samples itself has this much of phase shift.

What may be possible reason?

Thanks,

Anup Kumar

  • 0
    TI__Genius 10285 points

    Hi Kumar,

    Let me check with our USS expert and get feedback to you.

    Best Regards

    Pengfei

  • 0
    TI__Mastermind 46765 points

    Hi Anup,

     "ADC samples itself has this much of phase shift." Do you have any ADC capture data to share here with the good ones and bad ones? You can also share the waveform data in GUI when you observe this issue. It would help us to understand more about your issue. 

    Best regards,

    Cash Hao 

  • 0 in reply to Cash Hao11
    Prodigy 230 points

    Hi Hao,

    Here is the data, The reference flow was Zero LPH but we were getting the 10000 LPH. I have attached the ADC samples.

    When abnormality occurs: -

    UPS DNS
    -13 -19
    10 7
    13 14
    12 13
    14 14
    13 14
    12 12
    12 12
    12 12
    12 12
    11 13
    12 12
    13 13
    12 12
    11 10
    12 11
    12 12
    12 11
    10 11
    11 11
    12 11
    11 11
    9 10
    10 10
    12 12
    11 10
    10 10
    12 11
    11 10
    8 7
    8 12
    18 26
    22 6
    -21 -34
    -11 37
    85 93
    45 -41
    -123 -130
    -43 99
    212 212
    85 -107
    -261 -259
    -86 167
    354 342
    125 -179
    -405 -385
    -120 245
    503 469
    159 -258
    -550 -510
    -151 323
    643 588
    185 -331
    -682 -618
    -173 395
    769 693
    210 -401
    -802 -719
    -194 461
    886 790
    229 -463
    -911 -808
    -211 521
    990 875
    246 -520
    -1005 -881
    -225 575
    1081 947
    258 -569
    -1083 -944
    -235 622
    1157 1007
    269 -608
    -1146 -991
    -240 662
    1221 1055
    274 -642
    -1195 -1028
    -241 696
    1273 1093
    274 -672
    -1234 -1051
    -236 731
    1316 1117
    268 -700
    -1263 -1067
    -226 759
    1352 1138
    262 -722
    -1287 -1078
    -218 784
    1380 1153
    257 -740
    -1306 -1088
    -213 803
    1403 1166
    255 -751
    -1319 -1096
    -210 818
    1423 1179
    256 -762
    -1331 -1103
    -208 830
    1440 1190
    257 -770
    -1341 -1111
    -205 840
    1455 1202
    258 -775
    -1350 -1118
    -208 848
    1468 1209
    255 -784
    -1359 -1123
    -204 859
    1479 1217
    255 -791
    -1365 -1126
    -200 870
    1493 1222
    251 -801
    -1373 -1128
    -193 883
    1506 1231
    251 -806
    -1380 -1134
    -198 888
    1412 1239
    228 -806
    -1382 -1135
    -195 887
    1511 1231
    245 -806
    -1368 -1110
    -182 859
    1447 1166
    220 -777
    -1306 -1044
    -163 798
    1323 1051
    178 -730
    -1204 -944
    -128 731
    1185 925
    139 -666
    -1080 -831
    -100 654
    1044 803
    107 -592
    -945 -716
    -72 579
    908 689
    82 -518
    -816 -609
    -49 507
    784 586
    59 -451
    -697 -512
    -28 442
    667 489

    When Everything works fine: - 

    UPS DNS
    1 5
    13 13
    14 14
    13 14
    14 13
    13 14
    12 12
    12 12
    13 12
    13 12
    12 11
    13 11
    12 12
    13 11
    11 10
    12 11
    12 11
    10 11
    11 10
    12 12
    13 12
    11 11
    11 10
    11 11
    12 12
    11 12
    11 11
    12 11
    11 11
    9 8
    10 9
    23 22
    18 18
    -29 -30
    8 7
    95 95
    13 11
    -136 -136
    15 15
    229 227
    9 7
    -282 -281
    19 18
    377 374
    0 -1
    -431 -429
    31 31
    527 526
    -15 -15
    -575 -574
    50 49
    667 665
    -32 -32
    -708 -705
    68 68
    795 792
    -49 -49
    -829 -826
    84 84
    912 907
    -65 -65
    -936 -932
    101 100
    1015 1011
    -81 -81
    -1029 -1026
    118 116
    1104 1101
    -95 -96
    -1106 -1102
    132 132
    1180 1174
    -108 -109
    -1166 -1162
    147 146
    1243 1236
    -121 -121
    -1212 -1209
    163 162
    1291 1287
    -135 -135
    -1248 -1243
    181 179
    1329 1323
    -152 -152
    -1273 -1269
    200 199
    1360 1354
    -168 -167
    -1293 -1290
    215 214
    1385 1378
    -179 -178
    -1308 -1304
    226 224
    1406 1399
    -185 -185
    -1319 -1316
    235 235
    1423 1417
    -192 -191
    -1331 -1327
    242 240
    1439 1434
    -195 -194
    -1340 -1336
    248 245
    1454 1447
    -197 -195
    -1349 -1345
    250 248
    1465 1458
    -202 -201
    -1357 -1352
    255 254
    1475 1470
    -206 -205
    -1361 -1358
    265 262
    1485 1478
    -214 -213
    -1367 -1364
    274 272
    1500 1492
    -215 -216
    -1374 -1370
    273 274
    1507 1501
    -214 -214
    -1376 -1372
    274 272
    1503 1496
    -221 -222
    -1356 -1353
    272 270
    1433 1426
    -223 -222
    -1289 -1285
    260 257
    1303 1297
    -225 -224
    -1179 -1176
    252 251
    1161 1155
    -220 -220
    -1051 -1047
    235 236
    1015 1010
    -206 -204
    -913 -911
    218 218
    880 875
    -188 -188
    -785 -783
    202 199
    753 750
    -171 -170
    -667 -664
    183 183
    637 634

    Regards,

    Anup Kumar

  • 0 in reply to Anup Kumar
    TI__Mastermind 46765 points

    Hi,

    I am not sure what causes the change on the ADC capture data. But I would suggest to use a lower Gain setting like -6.5dB and a lower number of excitation pulses first like 12 pulses. Then check if you still observe the issue. 

    Best regards,

    Cash Hao

  • 0 in reply to Cash Hao11
    Prodigy 230 points

    Thanks for your reply, 

    Currently I was using 25 pulses, gain 1 dB, sampling freq = 4Mhz, Capture duration 40 micro sec. Transmit freq = 1Mhz. UPS & DNS gap 3000 micro sec, UPS0 & UPS1 gap 1000 milli sec.

    Now I will test with the settings you have mentioned.

    This issue is random, sometimes doesn't occur for whole day but sometimes it is very frequent.

    Regards,

    Anup Kumar.

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