MAX5387EVKIT+ Maxim Integrated, MAX5387EVKIT+ Datasheet - Page 7

• Manufacturer Part Number: MAX5387EVKIT+
• Description: Digital Potentiometer Development Tools Maxim Evaluation Kit
• Manufacturer: Maxim Integrated

Specifications of MAX5387EVKIT+

• Product: Evaluation Kits
• Tool Is For Evaluation Of: MAX5387
• Resistance: 10 kOhms
• Operating Supply Voltage: 2.6 V to 5.5 V
• Description/function: Dual Low Voltage Digital Potentiometer
• Interface Type: 2 Wire, Serial

Table 2. MAX5387 I
The U_ Data Sent indicators in the DEVICES group box
display the last data sent from the master (software) to
the MAX5387. The U_ Data Sent indicators display the
last data sent for the write to potentiometer A (0x11),
potentiometer B (0x12), or both potentiometer (0x13)
commands.
The MAX5387 IC uses an 8-bit (MSBs, D7–D0) data byte
to set the wiper position. Refer to the MAX5387 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. Using Shift +
Tab moves the selection to the previously selected con-
trol. 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 press-
ing 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.
There are two methods for communicating with the
MAX5387 EV kit, through the normal user-interface
panel (Figure 1) or through the I
by using low-level SMBus commands, or by select-
ing the 2-Wire Interface (Figure 4) utility from the
Options | Advanced User Interface menu bar. A win-
dow is displayed that allows I
SMBusReadByte and SMBusWriteByte. Do not use
the SMBusReadByte operation because the MAX5387
does not send data to the master.
Note: The I
binary, decimal, or hexadecimal. Hexadecimal numbers
REGISTER
MAX5387
VREGAB
VREGA
VREGB
2
C dialog boxes accept numeric data in
_______________________________________________________________________________________
00010001
00010010
00010011
BINARY
2
C Commands
COMMAND
Simple I
Keyboard Navigation
Data Sent Indicator
2
2
C operations, such as
C commands available
2
0x11
0x12
0x13
HEX
C Commands
MAX5387 Evaluation System
I
I
I
I
I
tion updates with I
2
2
2
2
2
C data is written to potentiometer A. Wiper WA position updates with
C data.
C data is written to potentiometer B. Wiper WB position updates with
C data.
C data is written to potentiometers A and B. Wipers WA and WB posi-
must be prefixed by $ or 0x. Binary numbers must be
exactly eight binary digits. See Figure 4 for an example
of this tool. In this example, the software is writing data
0xFF to the register address 0x13 to the device with
the device address 0x52. The data sequence sets the
MAX5387 (U2) wiper positions WA and WB to 255.
Refer to Application Note 476: Comparing the I
to the SMBus available on the Maxim website for infor-
mation and differences between the SMBus and I
protocols.
Problem: Software reports it cannot find the interface
circuit.
• Is the USB cable connected to the MINIQUSB+
• Has Windows plug-and-play detected the board?
Problem: Software reports No Devices Found.
• Is a shunt installed at jumper JU1?
• Are the SCL and SDA signals pulled up to VPOWER
• If using an external power supply, is power applied
• Are shunts installed at jumpers JU7, JU8, and JU9
• If using an off-board I
board?
Bring up Control Panel->System->Device Manager,
and look at what device nodes are indicated for USB.
If there is an Unknown device node attached to
the USB, uninstall it—this forces plug-and-play to try
again.
2
(resistors R6, R7, R9, and R10 installed)?
to the EV kit VDD and GND PCB pads?
(set device address)?
ground connected to the EV kit ground (GND) at
one of the header J1 pin connections (J1-2, J1-4
or J1-6)?
C data.
DESCRIPTION
General Troubleshooting
2
C interface, is the power
2
C Bus
2
C
7