MAX5393EVMINIQU+ Maxim Integrated, MAX5393EVMINIQU+ Datasheet - Page 6

• Manufacturer Part Number: MAX5393EVMINIQU+
• Description: Digital Potentiometer Development Tools MAX5393 Eval Kit
• Manufacturer: Maxim Integrated
• Series: MAX5391, MAX5393r

Specifications of MAX5393EVMINIQU+

• Rohs: yes
• Product: Evaluation Systems
• Tool Is For Evaluation Of: MAX5393
• Resistance: 50 kOhms
• Operating Supply Voltage: 1.7 V to 5.25 V
• Interface Type: 3 Wire, Serial, USB

MAX5393 Evaluation System
The EV kit software enters the demo mode, when the
USB connection is not detected, by selecting Cancel on
the MAX5393_ Evaluation_ Kit_ Interface_ Circuit popup
window (Figure 2). The software can also enter demo
mode at any time from the main window by selecting
the Options_ |_ Demo_ Mode menu item. When in demo
mode, all software communication to the EV kit circuit
is disabled; however, most of the software GUI is func-
tional. Demo mode allows the user to evaluate the soft-
ware without hardware connectivity. To exit demo mode,
deselect the Options_|_Demo_Mode menu item.
The wiper position track bars (WA, WB) in the
Potentiometer_ A and Potentiometer_ B group boxes
are used to independently change the wiper position
between the H_ and L_ end points. Use the computer
mouse or 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 arrows in the
respective edit box. A change in the W_ wiper position_
track bars, or HW_/WL_ edit boxes writes to the regis-
ters 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 potentiometer 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 simultane-
ously by checking the Update_ Pot_ A_ and_ B checkbox.
When enabled, the Potentiometer_ A group box sends
the same data to both of the digital potentiometers and
enables control of both digital potentiometers together.
Pressing the Default button resets potentiometer A and
B wiper positions in the MAX5393 to the factory-default
midscale position.
Table_2._MAX5393_SPI_Command
6_ _ _______________________________________________________________________________________
REGISTER
MAX5393
VREGAB
Potentiometer A and B Wiper Positions
VREGA
VREGB
00000000
00000001
00000011
BINARY
COMMAND
Factory Default
HEX
0x00
0x01
0x03
Demo Mode
SPI data is written to potentiometers A and B. Wipers WA and WB posi-
tion updates with SPI data.
SPI data is written to potentiometer A. Wiper WA position updates with
SPI data.
SPI data is written to potentiometer B. Wiper WB position updates with
SPI data.
The Status indicator in the Interface group box displays
EV_ Kit_ Operational when the EV kit enters the normal
operating mode after the USB connection is detected.
If the USB connection is not detected, or when the
software enters the demo mode, the Status indicator
displays Demo_ Mode. Demo mode is used to exercise
the software without hardware connectivity.
The Command_Sent indicator in the Interface group box
displays the last command sent from the master (soft-
ware) to the MAX5393. There are three SPI commands
available in the MAX5393 IC, which Table 2 describes.
The Data_ Sent indicator displays the last data sent for
the write to potentiometer A (0x00), potentiometer B
(0x01), or both potentiometer A and B (0x03) commands.
The MAX5393 IC uses an 8-bit (MSBs, D7:D0) data byte
to set the wiper position. Refer to the MAX5391/MAX5393
IC data sheet for additional information.
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 pressing 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.
There are two methods for communicating with the EV
kit, through the normal user-interface panel (Figure 1)
or through the SPI commands available by selecting
DESCRIPTION
Command Sent Indicator
Simple SPI Commands
Keyboard Navigation
Data Sent Indicator
Status Indicator