Datasheet

PmodAD5™ Reference Manual
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Page 2 of 4
and then clock in the 24 bits of data from the data register and finally pull the chip select line back to a high
voltage state. An example of what the data stream might look like is given below:
Table 1. Example data stream of the measured differential voltage.
Some users may wish to have a wider voltage range than 2.5V ±19.53 mV that they are able to analyze. This can be
adjusted by changing specific values within the Configuration register; namely, the Reference Select bit (D20) and
the three gain bits (D2-D0).
An example bit stream that changes the Reference Select bit from the default reference of 2.5V to the user
supplied reference voltage between pins REFIN2+ and REFIN2- and changes the gain from the default of 128 to 1 is
provided below:
Table 2. Example data stream of the measured differential voltage.
Communications Register
~Wen
R/~W
Data Register Address
CREAD
0
0
0
1
0
1
1
0
0
0
Data Register
Read Bits D23-D0
Communications Register
~Wen
R/~W
Configuration Register Address
CREAD
0
0
0
0
0
1
0
0
0
0
Configuration Register (first 8 of 24 bits)
Chop
0
0
REFSEL
0
Pseudo
Short
TEMP
0
0
0
1
0
0
0
0
Configuration Register (second 8 of 24 bits)
Channel Enable bits for CH7 - CH0
0
0
0
0
0
0
0
1
Configuration Register (last 8 of 24 bits)
Burn
REFDET
0
BUF
U/~B
G2
G1
G0
0
0
0
1
0
0
0
0