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MAX5474EVKIT

MAX5474 Evaluation Kit

Maxim Integrated 

MAX5474 Evaluation Kit

The stand-alone-operation switches can be used to

store the MAX5474 wiper position into nonvolatile mem-

ory. To store the MAX5474 wiper position into non-

volatile memory, set the wiper to the desired position

and slide the SPDT switch SW1 (CS) from EN to DIS

(rising edge), while pushbutton switch SW3 (INC) is not

depressed (high). The wiper returns to this stored posi-

tion upon power-up.

Voltage-Divider with Ground Reference

The MAX5474 EV kit provides an option to configure

the MAX5474 as a voltage-divider referenced to ground

(GND). To configure the EV kit as a voltage-divider ref-

erenced to ground, connect the L PCB pad to GND

using jumper JU5, connect the voltage source to the H

PCB pad, and the application input signal to the W PCB

pad. Jumper JU5 connects or disconnects the L signal

from GND. Table 3 lists the JU5 jumper options.

Table 3. JU5 Jumper Functions (L Signal

and GND)

SHUNT

POSITION

L PIN

CONNECTED TO

EV KIT FUNCTIONS

Not installed*

L PCB pad

Potentiometer or

variable resistor

Installed

GND

Voltage-divider with

ground reference

*Default position.

Variable Resistor or Potentiometer

The MAX5474 EV kit configures the MAX5474 as a

potentiometer by default. The EV kit provides an option

to reconfigure the MAX5474 as a variable resistor by

connecting the MAX5474 IC’s H and W pins. To recon-

figure the MAX5474 as a variable resistor, install a shunt

on jumper JU6. Table 4 lists the JU6 jumper options.

Table 4. JU6 Jumper Functions

(H and W pins)

SHUNT

POSITION

Not installed*

Installed

*Default position.

H AND W PINS

Not connected

Connected

EV KIT FUNCTIONS

Potentiometer

Variable resistor

Stand-Alone Operation Switches (SW1, SW2, SW3)

The MAX5474 EV kit features three switches to control

the MAX5474 interface signals for stand-alone opera-

tion. SPDT slide switches SW1 and SW2 control the CS

and U/D signals, respectively, and pushbutton switch

SW3 controls the INC signal. The CS, U/D, and INC sig-

nals interact to control the wiper position of the

MAX5474. Table 5 lists the functions of switches SW1,

SW2, and SW3 for stand-alone operation. Refer to the

Truth Table in the MAX5474 IC data sheet for specific

switch sequence.

Table 5. Stand-Alone Operation for SW1,

SW2, SW3 Switch Functions (CS, U/D,

INC Signals)

SWITCH

LOGIC-

INPUT PINS

LOGIC-INPUT PINS FUNCTION

SW1

CS

High = U1 disabled

Low = U1 enabled

SW2

U/D

High = Increment up

Low = Decrement down

SW3

Increment if: CS = low, U/D = high,

INC

and INC = ↓

Decrement if: CS = low, U/D = low,

and INC = ↓

↓ = High-to-low transition.

Note: For stand-alone operation:

1) To power the EV kit, connect an external power

supply to VIN and GND and install a shunt on pins

2-3 of jumper JU1 (see Table 1).

2) To utilize the switches, install a shunt across pins 1-

4 of jumpers JU2, JU3, and JU4 (see Table 2).

Evaluating the MAX5475

The MAX5475 is similar to the MAX5474, but has an

end-to-end resistance of 100kΩ. To evaluate the

MAX5475, order a free sample of the MAX5475 and

replace IC U1. The software is compatible with the

MAX5475 IC.

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