8.4.12.2 GANCAL Command

The GANCAL command performs a gain calibration. Before sending the GANCAL command sequence (Figure 65), a dc input must be applied (typically full-scale input, but not to exceed 106% full-scale). After the signal has stabilized, the command sequence can be sent. The ADS1284 averages 16 readings, then computes a gain value that scales the applied calibration voltage to full-scale. The gain value is written to the FSC register, where the contents are subsequently read or written.