MAX5388EVMINIQU+ Maxim Integrated, MAX5388EVMINIQU+ Datasheet - Page 5

• Manufacturer Part Number: MAX5388EVMINIQU+
• Description: Digital Potentiometer Development Tools MAX5386/88/91/93 Eval Kit
• Manufacturer: Maxim Integrated
• Series: MAX5386, MAX5388r

Specifications of MAX5388EVMINIQU+

• Rohs: yes
• Product: Evaluation Systems
• Tool Is For Evaluation Of: MAX5388
• Resistance: 100 kOhms
• Operating Supply Voltage: 2.6 V to 5.25 V
• Interface Type: 3 Wire, Serial, USB

connection is detected and the part has been selected.
Since the MAX5388 does not have read capability, all
the edit boxes are set to question marks (??) and the
Potentiometer_ track bar is set to midscale. If the USB
connection is not detected, the software prompts the
user to retry, exit the program, or enter the demo mode.
The EV kit software enters the demo mode—when the
USB connection is not detected—by selecting Cancel
on the MAX5388 Evaluation Kit Interface Circuit
popup window (Figure 2). The software can also enter
demo mode at any time from the main window by select-
ing 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
functional. Demo mode allows the user to evaluate the
software 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 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 posi-
tion 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 volatile memory
Figure 2. MAX5388 Evaluation Kit Interface Circuit Popup Window (Interface Board Not Found)
Table 2. MAX5388 SPI Command
MAX5388 REGISTER
Potentiometer A and B Wiper Positions
VREGA
VREGB
_______________________________________________________________________________________
00000000
00000001
BINARY
COMMAND
Demo Mode
HEX
0x00
0x01
MAX5388 Evaluation System
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.
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.
Pressing the Default button resets the potentiometer A
and B wiper positions to the factory-default midscale
position.
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
(software) to the MAX5388. There are two commands
available in the MAX5388 IC. Table 2 describes the two
MAX5388 commands.
The Data Sent indicator in the Interface group box dis-
plays the last data sent from the master (software) to the
MAX5388. The Data Sent indicator displays the last data
DESCRIPTION
Command Sent Indicator
Data Sent Indicator
Status Indicator
Factory Default
5