7.2 Formula to Calculate Response Time
The formula in Table 7-1 is used to calculate response time:
| (CFG0 = A/C/D): | (2 x Measurement period) + (1 x Measurement time x Total number of sensors enabled) + (3 x Measurement time x Total number of sensors touched) |
| Free-running measurements (CFG0 = B): | (3 x Measurement time x Total number of sensors enabled) + (3 x Measurement time x Total number of sensors touched) |
For oversampling, measurement time is provided in Table 7-2. Due to frequency hopping,
measurement time varies based on noise level. The data captured in this table show the maximum
measurement time.
| Number of Samples (CFG1) | Measurement Time |
|---|---|
| 8 | 0.7 ms |
| 16 | 1.4 ms |
| 32 | 2.8 ms |
| 64 | 5.6 ms |
Example calculation #1:
- Oversample: 8
- Measurement Period: 50 ms
- Number of sensors enabled: 6
- Number of sensors touched: 2
- Response Time = 2 * 50 + 1 * 0.8 * 6 + 3 * 0.8 * 2 = 110 ms
Example calculation #2:
- Oversample: 32
- Measurement Period: 50 ms
- Number of sensors enabled: 4
- Number of sensors touched: 2
- Response Time = 2 * 50 + 1 * 2.9 * 4 + 3 * 2.9 * 2 = 129 ms