Analog Devices AD5422 Evaluation Board EVAL-AD5422EBZ EVAL-AD5422EBZ Data Sheet

Product codes
EVAL-AD5422EBZ
Page of 12
  
EVAL-AD5422
 
Rev. 0 | Page 7 of 12 
SOFTWARE OPERATION 
The main window is divided into eight boxes, or sections: Input 
Register
Status RegisterControl RegisterReset Register
Clear/Clear Select Pins
Read/Write RegistersMeasure 
Output Voltage/Current
, and Program Voltage/Current. 
Input Register 
The Input Register section displays the contents of the input 
register. The 24-bit display is updated each time you request a 
read or write operation via the main window controls. It allows 
you to associate the value written to the AD5422 with the 
various programmable functions. 
Status Register 
The Status Register section displays the states of the three bits 
of the read-only status register. To read the register, click Read 
Status Register
Control Register 
The Control Register section facilitates programming of the 
control register on an individual bit basis. To change the value 
of a bit, click the relevant button. Each button also displays the 
current state of the bit. You can also type code in the SR CLOCK 
and SR STEP text boxes and select an output range from the 
OUTPUT RANGE
 drop-down box. 
Reset Register 
The sole function of the Reset Register section is to allow the 
AD5422 to be reset to its power-on state. To change the value of 
the reset bit, click RESET
Clear/Clear Select Pins 
In the Clear/Clear Select Pins section, you can change the state 
of the CLEAR pin by clicking the CLEAR button. Likewise, you 
can change the state of the CLEAR SELECT pin by clicking the 
CLEAR SELECT 
button. 
Read/Write Registers 
In the Read/Write Registers section, you can read from and 
write to all registers in the AD5422. To select a register and 
request a read or write, use the Select Control Function drop-
down box. Then, to write data to the register, select the desired 
data from the Data Write drop-down box and then click OK
The register data is updated and displayed in the Data Read 
box each time you click OK
Measure Output Voltage/Current 
To display the programmed output voltage or current in the 
Measure Output Voltage/Current
 section, click Measure 
output Values
. The output voltage/current is measured using 
the on-board ADC and is displayed in volts or milliamperes in 
the V
OUT
 or I
OUT
 box. The output value is measured with an 
accuracy of approximately 1% and is, therefore, not intended to 
be precise, but rather is an approximate feedback of the 
programmed value. 
Program Voltage/Current 
To program a voltage or current output value, type the value in 
either volts or milliamperes in the Enter Output Value box of 
the Program Voltage/Current section, and then press the 
Enter
 key. The output must first be enabled, and the output 
range must be selected via the Control Register section.