SNOA949 May 2016 LDC1312 , LDC1312-Q1 , LDC1314 , LDC1314-Q1 , LDC1612 , LDC1612-Q1 , LDC1614 , LDC1614-Q1
The LDC1614 does not retain its conversion results when in sleep mode. Because of this, the device cannot be put into the sleep state until the channel conversion measurements have been read by the microcontroller. Therefore, the data registers must be read while the device is still running in active mode, which results in a fixed power consumption overhead. From the data given in Table 3, the data readback time is 0.688 ms if a 400-kHz I2C interface is used. This overhead has a greater percentage impact on conversion times at low RCOUNT values where the data conversion times are less than 10x the data readback time.
| RCOUNT | Data Conversion Time
(tS+ tC + tSD) (ms) |
Readback Time
(tRB) (ms) |
Data Conversion Time +
Data Readback Time (ms) |
|---|---|---|---|
| 500 | 0.196 | 0.688 | 0.884 |
| 1000 | 0.381 | 0.688 | 1.069 |
| 5000 | 1.855 | 0.688 | 2.543 |
| 10000 | 3.699 | 0.688 | 4.387 |
| 20000 | 7.385 | 0.688 | 8.073 |
| 30000 | 11.072 | 0.688 | 11.76 |
| 40000 | 14.758 | 0.688 | 15.446 |
| 50000 | 18.445 | 0.688 | 19.133 |