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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
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)
from GND. Table 3 lists the JU5 jumper options.
Table 3. JU5 Jumper Functions (L Signal
and GND)
SWITCH
SW1
LOGIC-
INPUT PINS
CS
LOGIC-INPUT PINS FUNCTION
High = U1 disabled
Low = U1 enabled
SHUNT
POSITION
Not installed*
Installed
L PIN
CONNECTED TO
L PCB pad
GND
EV KIT FUNCTIONS
Potentiometer or
variable resistor
Voltage-divider with
ground reference
SW2
SW3
U/ D
INC
High = Increment up
Low = Decrement down
Increment if: CS = low, U/ D = high,
and INC = ↓
Decrement if: CS = low, U/ D = low,
and INC = ↓
*Default position.
Variable Resistor or Potentiometer
↓ = High-to-low transition.
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)
Note: For stand-alone operation:
1) To power the EV kit, connect an external power
supply to V IN 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
SHUNT
POSITION
Not installed*
Installed
H AND W PINS
Not connected
Connected
EV KIT FUNCTIONS
Potentiometer
Variable resistor
end-to-end resistance of 100k Ω . To evaluate the
MAX5475, order a free sample of the MAX5475 and
replace IC U1. The software is compatible with the
MAX5475 IC.
*Default position.
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