Address Selection

Jumper JU1 sets the unique MAX5417L slave address.

The two possible hex addresses are 0x50 or 0x52. See

Table 1 for jumper settings to set the MAX5417L slave

address.

Note: The first 7 bits shown are the address. The Y bit

states that this bit is a 1 for a read operation or a 0 for a

write. The Y bit is always set to 0 (write only) because

these digital potentiometers do not transmit data to the

master device.

The MAX5417L EV kit features a 2 x 10, right-angle

header receptacle (J1) to interface with the CMODUSB

command module. Pin J1-7 connects to the MAX5417L

clock pin (SCL) and pin J1-3 connects to the data pin

SW1 dip switches on the command module to the ON

position to connect pullup resistors to the SCL and SDA

The clock and data input pins can also be accessed at

the SCL and SDA EV kit pads, respectively. An external

SDA, and GND pads to communicate with the

MAX5417L IC. If the external device does not have

pullup resistors on the clock and data lines, 2.4kΩ (typ)

pullup surface-mount resistors (0805 size) must be

communication. The GND pad must also be connected

Digital Potentiometer Pins

The high (H), low (L), and wiper (W) pins of the

MAX5417L digital potentiometer can be accessed at the

EV kit’s H, L, and W pads, respectively. Jumper JU3 can

be used to connect the L pin to the circuit ground thus

providing a ground reference during evaluation.

Power Input

The MAX5417L EV kit requires a 2.7V to 5.25V power

supply connected across the VDD and GND pads for

normal operation. The EV kit can also use the

CMODUSB command module’s 3.3V or 5V power

source by installing a shorting jumper across JU2 of the

MAX5417L EV kit. Configure the command module’s

VDD select voltage to 3.3V or 5V (jumper J1) when

using the command module to power the MAX5417L

EV kit.

Note: Ensure that all the data sheet absolute maximum

specifications are not violated when operating the

MAX5417L EV kit.

Evaluating Other Versions of the

MAX5417/MAX5418/MAX5419 ICs

The MAX5417L EV kit PC board can be used to evalu-

ate other addressing options of the MAX5417,

MAX5418, or MAX5419 digital potentiometers. Remove

the MAX5417L IC (U1) and replace it with the new IC

(see the Interface section). Refer to the MAX5417/

MAX5418/MAX5419 data sheet for a complete descrip-

tion of part-to-part differences.

Detailed Description

of Software

Note: Words in boldface are user-selectable features in

the software.

User-Interface Panel

The user interface (shown in Figure 1) is easy to operate.

Use the mouse, or press the tab key to navigate through

erated to update the internal memory registers of the

MAX5417L when any of these controls are used.

The software divides EV kit functions into logical blocks.

The Interface box indicates the current Device Type,

Device Address, I2C Bus Speed, EV kit Status, and the

last write operation Command Sent and Data Sent indi-

cators. This data is used to confirm proper device opera-

tion. The Potentiometer Control box changes the wiper

position and transfers the data from the volatile memory

to the nonvolatile memory or vice-versa.

The MAX5417L EV kit software features additional func-

tions to simplify operation. Automatic Diagnostics

continually probe the interface board and the

MAX5417L EV kit to make sure that all connections are

maintained and that all devices are working properly.

MAX5417L Evaluation Kit/Evaluation System

_______________________________________________________________________________________

3

MAX5417L ADDRESS

SHUNT POSITION

MAX5417L ADDRESS A0 PIN

BINARY

HEXADECIMAL

1-2

Connected to VDD

0101 001Y

0x52

2-3

Connected to GND

0101 000Y

0x50

Table 1. Jumper Settings for Device Address (JU1)