Specifications

147
to clear FIFO. Then to set A/D channel to channel 2, and to set the
range as -5 V to +5 V.
9. Writing the value from 0x0300 to 0x03FF sequentially to
Calibration Command and Data register (BASE+18), and get
each bipolar range’s data by software trigger A/D method. Be
noted that to repeat this procedure 1000 times then to average
those data for each value. After that, to see whether the average
data is close to 65534.6. If so, to go to next step. Otherwise, you
must change the value and repeat all the procedure in this step
again until the average data close to 65534.6.
10. Repeat steps 2 to 9 several times.
Table E-1 A/D binary code table
A/D code Mapping Voltage
Hex. Dec. Bipolar Unipolar
0000h 0 -FS 0
7FFFh 32767 –1 LSB
0.5 FS – 1
LSB
8000h 32768 0 0.5 FS
FFFFh 65535 +FS – 1 LSB FS – 1 LSB
Note
n 1 LSB = FS / 65535 for Unipolar
(For example: 1LSB = 10 / 65535, while the range is 0 V to10 V)
n 1 LSB = +FS / 32768 for Bipolar
(For example: 1LSB = 5 / 32768, while the range is –5 V to +5 V)