Datasheet

MAX5392 Evaluation System
Evaluates: MAX5387/MAX5392
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boxes. U2_MAX5387 and U4_MAX5392 Device
Address combo boxes store addresses 0x52 and 0x5A,
respectively.
U_ Status displays Device Connected when the select-
ed address is found or No Connection when the select-
ed address is not found. When selecting an address
currently in use, the Device Address combo box is set to
?? and U_ Status also displays No Connection.
Factory Default
Pressing the Default buttons resets potentiometer A
and B wiper positions to the factory-default midscale
position.
Potentiometer A and B Wiper Positions
The wiper position track bars (WA, WB) in the
Potentiometer A and Potentiometer B group boxes are
used to change the wiper position between the H_ and
L_ end points. Use the mouse or keyboard arrow keys to
move the wiper position between the 256 position points.
The wiper position can also be changed by entering the
desired integer value in the edit boxes, or by pressing
the up or down edit box arrows. A change in the W_
wiper position track bars or HW_/WL_ edit boxes writes
to the volatile memory and the wiper position is updated
with the data sent. The wiper position is shown in the
HW_ and WL_ edit boxes. The HW_ edit box shows the
wiper position with respect to the H_ end point, and the
WL_ edit box shows the wiper position with respect to
the potentiometer L_ end point.
Potentiometers A and B can be updated simultaneously
by checking the Update Pot A and B checkbox. When
enabled, the Potentiometer A group box sends the
same data to both digital potentiometers and enables
control of both digital potentiometers together.
Command Sent Indicator
The U_ Command Sent indicators in the DEVICES
group box displays the last command sent from the mas-
ter (software) to the MAX5392. There are three MAX5392
commands available in the MAX5392 IC, which are
described in Table 2.
Data Sent Indicator
The U_ Data Sent indicator in the DEVICES group box
displays the last data sent from the master (software) to
the MAX5392. The U_ Data Sent indicator displays the
last data sent for the write to potentiometer A (0x11),
potentiometer B (0x12), or both potentiometer (0x13)
commands.
The MAX5392 IC uses an 8-bit (MSBs, D7:D0) data byte
to set the wiper position. Refer to the MAX5392 IC data
sheet for additional information.
Keyboard Navigation
Press the Ctrl + Tab keys to navigate to the tab sheets.
The selected tab sheet is indicated by a dotted outline.
Press the Tab key to select each GUI control. The select-
ed control is indicated by a dotted outline. Pressing Shift
+ Tab moves the selection to the previously selected
control. Buttons respond to the keyboard’s space bar
and some controls respond to the keyboard’s up-and-
down arrow keys. Activate the program’s menu bar by
pressing the F10 key and then press the letter of the
desired menu item. Most menu items have one letter
underlined, indicating their shortcut key.
When a number is entered into the edit boxes, it can be
sent to the device by pressing the Enter key. It is also
sent when Tab or Shift + Tab is pressed.
Table 2. MAX5392 I
2
C Commands
MAX5392
REGISTER
COMMAND
DESCRIPTION
BINARY HEX
VREGA 00010001 0x11 I
2
C data is written to potentiometer A. Wiper WA position updates with I
2
C data.
VREGB 00010010 0x12 I
2
C data is written to potentiometer B. Wiper WB position updates with I
2
C data.
VREGAB 00010011 0x13
I
2
C data is written to potentiometers A and B. Wipers WA and WB position
updates with I
2
C data.