ADS7128 Autonomous Sequence Test
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CH0=HIGH, CH7=LOW (voltage divider on CH1-CH6)

Test 1: Auto-sequence CH1-CH6
  CH1: 4.09 V
  CH2: 3.58 V
  CH3: 2.93 V
  CH4: 2.25 V
  CH5: 1.54 V
  CH6: 0.76 V
  Monotonically decreasing: PASS
  CH1 > 3.0V: PASS
  CH6 < 2.0V: PASS

Test 2: Sequence results match manual reads
  CH1: seq=3347 manual=3347 diff=0 ... PASS
  CH2: seq=2933 manual=2933 diff=0 ... PASS
  CH3: seq=2403 manual=2403 diff=0 ... PASS
  CH4: seq=1845 manual=1845 diff=0 ... PASS
  CH5: seq=1263 manual=1263 diff=0 ... PASS
  CH6: seq=626 manual=626 diff=0 ... PASS
  All within tolerance: PASS

Test 3: Selective sequence (CH2 + CH5 only)
  CH2: 3.31 V  CH5: 1.65 V
  CH2 > CH5: PASS

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RESULTS: 3/3 tests passed
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