MAX5389 Evaluation Kit
Evaluates: MAX5389
4 ______________________________________________________________________________________
To increment wiper WA position:
1) Press SW1 and hold (CSA = low), or remove the shunt
at jumper JU2.
2) Press, then release SW3 (INCA high-to-low transition).
To decrement wiper WA position:
1) Press SW1 and hold (CSA = low), or remove the shunt
at jumper JU2.
2) Press SW2 and hold (UDA = low).
3) Press, then release SW3 (INCA high-to-low transition)
Potentiometer B Control
Jumpers JU5, JU6, and JU7 configure the EV kit opera-
tion for pushbutton control of the MAX5389 CSB, UDB,
and INCB digital inputs, respectively. Install shunts
across jumpers JU5, JU6, and JU7 for wiper WB posi-
tioning using pushbutton switches SW4, SW5, and SW6.
SW4 sets chip-select input CSB low. SW5 configures
the wiper for incrementing or decrementing operation
(UDB). SW6 controls the wiper position. The MAX5389
increments or decrements the wiper WB position on a
high-to-low transition at INCB.
Remove the shunts at JU5, JU6, and JU7 to position WB
using digital signals at header J1 (pins J1-9, J1-11, and
J1-13). See Table 1 for proper JU5, JU6, and JU7 jumper
configurations.
To increment wiper WB position:
1) Press SW4 and hold (CSB = low), or remove the shunt
at jumper JU5.
2) Press, then release SW6 (INCB high-to-low transition).
To decrement wiper WB position:
1) Press SW4 and hold (CSB = low), or remove the shunt
at jumper JU5.
2) Press SW5 and hold (UDA = low).
3) Press, then release SW6 (INCB high-to-low transition).
Potentiometer, Voltage-Divider or Variable Resistor,
with Ground Reference
The EV kit provides an option to configure the MAX5389
as a potentiometer or a voltage-divider open-ended or
with ground reference, respectively. Use jumpers JU8
and JU9 for potentiometer A and jumpers JU10 and
JU11 for potentiometer B configuration. Tables 4 and 5
list the jumper options for configuring potentiometers A
and B.
The MAX5389 can also be configured as a variable
resistor by shorting the H_ and W_ pads using a wire.
When operating as a variable resistor, any power source
connected to the H_, W_, or L_ pad must be voltage and
current limited to the maximum conditions stated in the
MAX5389 IC data sheet.
Note that to test the device in resistor mode, the
ohmmeter must be GND referenced to the MAX5389.
This can be accomplished by connecting the L_ pad to
GND or the H_ pad to VDD. Resistance is then measured
between the W_ and L_ or W_ and H_ PCB pads.
Table 4. JU8 and JU9 Jumper Functions (Potentiometer A)
Table 5. JU10 and JU11 Jumper Functions (Potentiometer B)
*Default position.
*Default position.
SHUNT POSITION
HA PAD LA PAD MAX5389 FUNCTION
JU8 JU9
Not installed*
Not installed
Not connected
Not connected Potentiometer open-ended
Installed* Connected to GND Potentiometer with GND reference
Installed
Not installed
Connected to VDD
Not connected Voltage-divider open-ended
Installed Connected to GND Voltage-divider with GND reference
SHUNT POSITION
HB PAD LB PAD MAX5389 FUNCTION
JU10 JU11
Not installed*
Not installed
Not connected
Not connected Potentiometer open-ended
Installed* Connected to GND Potentiometer with GND reference
Installed
Not installed
Connected to VDD
Not connected Voltage-divider open-ended
Installed Connected to GND Voltage-divider with GND reference
