Datasheet

PmodDA4™ Reference Manual
Copyright Digilent, Inc. All rights reserved.
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Page 2 of 3
DB31 (MSB)
Command Bits
Address Bits
X
X
X
X
C3
C2
C1
C0
A3
A2
A1
A0
Data Bits
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
DB0 (LSB)
X
X
X
X
X
X
X
X
Table 1. Example data stream from the AD5628 datasheet.
Users should note that the PmodDA4 by default attempts to use an external reference voltage. However, as there
is no external reference voltage provided on the Pmod, users must write to the register to program the chip to use
its internal reference voltage of 2.5V. The data stream required to change this is provided below:
Internal REF Register (DB0)
Action
0
Reference off (default)
1
Reference on
Table 2. Internal reference register from the AD5628 datasheet (table 10).
DB31 to DB28
DB27
DB26
DB25
DB24
X
1
0
0
0
Don't Cares
Command bits (C3 to C0)
DB23
DB22
DB21
DB20
DB19 to DB1
DB0
X
X
X
X
X
1/0
Address bits (A3 to A0) - don't cares
Don't cares
Internal REF
register
Table 3. 32-bit input shift register contents for reference set-up command from the AD5628 datasheet (table 11).
The various commands and addresses available for the on-board AD5628 can be found on page 22 of its datasheet.
2.1 Pinout Description Table
Any external power applied to the PmodDA4 must be within 2.7V and 5.5V; however, it is recommended that
Pmod is operated at 3.3V.
Pin
Signal
Description
1
~CS
Chip Select
2
MOSI
Master-Out-Slave-In
3
(NC)
Not Connected
4
SCLK
Serial Clock
5
GND
Power Supply Ground
6
VCC
Power Supply (3.3V/5V)