JAJSOX0A March 2024 – June 2024 ADS127L18
ADVANCE INFORMATION
The data port outputs the channel conversion data in the form of a data packet. A data packet consists of a STATUS_DP header byte, the channel data, and a CRC byte. The STATUS_DP and CRC bytes are optional and correspond to conversion data for each channel. As shown in Figure 7-38, the data packet ranges in size from two bytes to five bytes. A two-byte packet only transmits 16-bit channel data and a five-byte packet transmits the header byte, 24 bits of data, and the CRC byte. The STATUS_DP and CRC bytes are enabled by bits 7 and 6 of the DP_CFG1 register.
The channel data are coded in two's-complement format, MSB sign bit first, in 16- or 24-bit resolution. The data resolution is programmed by the DATA bit of the GEN_CFG3 register. Table 7-14 lists the data scaling for 24-bit resolution. Conversion data clip at positive and negative full-scale values when the input signal exceeds the positive and negative full-scale range. 16-bit resolution mode rounds the data to the nearest 16-bit value.
INPUT VOLTAGE, VIN (V)(1) | 24-BIT OUTPUT DATA(2) | |
---|---|---|
STANDARD RANGE | EXTENDED RANGE | |
1.25 · k · VREF · (223 – 1) / 223 | 7FFFFFh | 7FFFFFh |
k · VREF · (223 – 1) / 223 | 666666h | |
k · VREF / 223 | 000001h | 000001h |
0 | 000000h | 000000h |
–k · VREF / 223 | FFFFFFh | FFFFFFh |
–k · VREF | 800000h | 99999Ah |
–1.25 · k · VREF | 800000h |