Datasheet

PmodAD5™ Reference Manual
Copyright Digilent, Inc. All rights reserved.
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Page 2 of 4
24 bits of data by first pulling the chip select line low and waiting the required conversion and settling time (100
ms by default). Users can then write to the communications register to indicate that they want to read the data
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