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MAX5389 Evaluation Kit
General Description
The MAX5389 evaluation kit (EV kit) is an assem-
bled and tested PCB that features the MAX5389M
50kI dual digital potentiometer. The EV kit provides a
mechanical pushbutton-controlled interface or a user-
supplied digital interface for the IC digital inputs for
changing the potentiometer wipers.
The EV kit operates from an external 2.8V to 5.5V power
supply applied at the VIN and GND PCB pads. The
MAX5389 operates from a 2.6V to 5.5V VDD supply.
Additional LDO regulators are provided to operate the
MAX5389 VDD input at 2.6V or 3.3V. The on-board regu-
lators require a 200mV overhead above their respective
outputs.
S
2.6V or 3.3V MAX5389 VDD input
S
Supports Pushbutton or Stand-Alone Digital Input
Features
S
2.8V to 5.5V Single-Supply Operation
Evaluates: MAX5389
Interfacing
Ordering Information
PART
TYPE
MAX5389EVKIT+
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
QTY
DESCRIPTION
10FF
Q10%,
6.3V X5R ceramic
capacitors (0805)
Murata GRM21BR60J106K
TDK C2012X5R0J106K
1FF
Q10%,
16V X5R ceramic
capacitors (0603)
TDK C1608X5R1C105K
0.1FF
Q10%,
10V X7R ceramic
capacitor (0603)
Murata GRM188R71H104K
TDK C1608X7R1H104K
Not installed, ceramic capacitor
(0603)
2 x 8-pin header
4-pin header
2-pin headers
100kI
Q5%
resistors (0603)
DESIGNATION
SW1–SW6
U1
QTY
6
1
DESCRIPTION
Momentary pushbutton switches
Dual 50kI potentiometer
(14 TSSOP)
Maxim MAX5389MAUD+
3.3V LDO regulator (5 SC70)
Maxim MAX8511EXK33+
(Top Mark: AEI)
2.6V LDO regulator (5 SC70)
Maxim MAX8511EXK26+
(Top Mark: AEG)
Octal switch debouncer
(20 SSOP)
Maxim MAX6818EAP+
Shunts (JU1–JU11)
PCB: MAX5389 EVALUATION
KIT+
C1, C3, C5
3
C2, C4, C6
3
U2
1
C7
1
U3
1
C8
J1
JU1
JU2–JU11
R1–R6
0
1
1
10
6
U4
—
—
1
11
1
Component Suppliers
SUPPLIER
Murata Electronics North America, Inc.
PHONE
770-436-1300
WEBSITE
www.murata-northamerica.com
TDK Corp.
847-803-6100
www.component.tdk.com
Note:
Indicate that you are using the MAX5389 when contacting these component suppliers.
_______________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX5389 Evaluation Kit
Evaluates: MAX5389
Quick Start
• MAX5389 EV kit
• 5V, 100mA power supply
• Two multimeters
The MAX5389 EV kit is fully assembled and tested.
Follow the steps below to verify board operation:
Procedure
Required Equipment
1) Verify that shunts are configured in the EV kit default
state for proper startup operation (see Table 1).
2) Apply a 5V power source across the VIN and GND
PCB pads.
3) Connect the multimeters to measure voltage across
the WA and LA PCB pads and WB and LB PCB pads
Table 1. Jumper Configuration (JU1–JU11)
JUMPER
SHUNT POSITION
1-2
JU1
1-3*
1-4
Not installed
JU2
JU3
JU4
JU5
JU6
JU7
JU8
JU9
JU10
JU11
*Default
position.
Installed
Not installed*
Installed*
Not installed
Installed*
Not installed
Installed
Not installed*
Installed*
Not installed
Installed*
Not installed
Installed*
Not installed
Installed*
Not installed
Installed*
Not installed
Installed*
Not installed
VDD = 3.3V
VDD = 2.6V
VDD = Voltage applied at the VIN PCB pad
VDD not powered or VDD signal applied at header J1-1
CSA
input pushbutton controlled
CSA
input logic-low or signal applied at header J1-3
UDA input pushbutton controlled
UDA input connects to the VIN supply or power applied at header J1-5
INCA
input pushbutton controlled
INCA
input connects to the VIN supply or power applied at header J1-7
CSB
input pushbutton controlled
CSB
input logic-low or signal applied at header J1-9
UDB input pushbutton controlled
UDB input connects to the VIN supply or power applied at header J1-11
INCB
input pushbutton controlled
INCB
input connects to the VIN supply or power applied at header J1-13
HA connected to the VDD voltage source
HA disconnected from the VDD voltage source
LA connected to GND
LA disconnected from GND
HB connected to the VDD voltage source
HB disconnected from the VDD voltage source
LB connected to GND
LB disconnected from GND
EV KIT FUNCTION
2
______________________________________________________________________________________
MAX5389 Evaluation Kit
Evaluates: MAX5389
Detailed Description of Hardware
The MAX5389 EV kit is an assembled and tested PCB
that features the MAX5389M 50kI dual digital poten-
tiometer. Each potentiometer has an end-to-end resis-
tance of 50kI. Each 256-tap wiper position can be con-
trolled independently using pushbutton switches. The EV
kit uses a MAX5389M IC in a 14-pin TSSOP package on
a proven two-layer PCB design.
The EV kit supports both mechanical and digital inputs
to control the potentiometer wiper positions using jump-
ers JU2–JU7. Install shunts across jumpers JU2–JU7
to control the MAX5389 logic inputs using pushbutton
switches SW1–SW6, respectively. See the
Potentiometer
A Control
and
Potentiometer B Control
sections for addi-
tional information.
The EV kit provides connector J1 to interface the
MAX5389
CSA, CSB, INCA, INCB,
UDA, and UDB sig-
nals directly to a user-supplied signal. Connector J1 also
provides a connection to the MAX5389 VDD input.
The EV kit operates from a 2.8V to 5.5V power supply
applied at the VIN and GND PCB pads. VIN powers the
MAX5389M (U1), two MAX8511 LDO regulators (U2, U3),
and the MAX6818 debouncer switch (U4). Regulators U2
and U3 are used to set the MAX5389 VDD input to 3.3V
or 2.6V, respectively.
Jumper JU1 selects the voltage applied at the MAX5389
VDD input. See Table 2 for proper jumper configuration
for setting the MAX5389 VDD input.
Note that the EV kit VIN input operates down to 2.6V.
However, a minimum 2.7V, 2.8V, and 3.5V is required
when operating debouncer U4, LDO U3, and LDO U2,
respectively.
Wiper WA positioning can be controlled through
momentary pushbutton switches SW1 (POTA_CSA),
SW2 (POTA_UDA), and SW3 (POTA_INCA) by
installing shunts across jumpers JU2, JU3, and JU4,
respectively. Wiper WB positioning can be controlled
through momentary pushbutton switches SW4 (POTB_
CSB),
SW5 (POTB_UDB), and SW6 (POTB_INCB) by
installing shunts across jumpers JU5, JU6, and JU7
respectively. The debouncer (U4) eliminates the “contact
bounce” that SW1–SW6 can exhibit and is not required if
using a digital interface.
The EV kit also provides connector J1 to interface the
MAX5389
CSA, CSB, INCA, INCB,
UDA, and UDB inputs
directly to user-supplied digital signals. See Table 3
for header J1 pin assignments. Refer to the
Up/Down
Interface
section in the MAX5389 IC data sheet for a
more detailed description.
Potentiometer A Control
Jumpers JU2, JU3, and JU4 configure the EV kit opera-
tion for pushbutton control of the MAX5389
CSA,
UDA,
and
INCA
digital inputs, respectively. Install shunts
across jumpers JU2, JU3, and JU4 for wiper WA posi-
tioning using pushbutton switches SW1, SW2, and SW3.
SW1 sets chip-select input
CSA
low. SW2 configures
the wiper for incrementing or decrementing operation
(UDA). SW3 controls the wiper position (INCA). The
MAX5389 increments or decrements wiper WA position
on a high-to-low transition at
INCA.
Remove the shunts at JU2, JU3, and JU4 to position
wiper WA using digital signals at header J1 (pins J1-3,
J1-5, and J1-7). See Table 1 for proper JU2, JU3, and
JU4 jumper configurations.
Digital Interface
EV Kit Power Source
Table 2. MAX5389 VDD Input (JU1)
SHUNT
POSITION
1-2
1-3
1-4
Not installed
MAX5389 VDD Voltage
3.3V (LDO U2)
2.6V (LDO U3)
Voltage applied at the VIN and GND PCB
pads
VDD not powered or power applied at
header J1-1
Table 3. Header J1 Pin Assignments
PIN
J1-1
J1-2, J1-4, J1-6, J1-8, J1-10,
J1-12, J1-14, J1-16
J1-3
J1-5
J1-7
J1-9
J1-11
J1-13
SIGNAL
VDD
GND
CSA
UDA
INCA
CSB
UDB
INCB
_______________________________________________________________________________________
3
MAX5389 Evaluation Kit
Evaluates: MAX5389
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)
SHUNT POSITION
JU8
Not installed*
Installed
*Default
position.
JU9
Not installed
Installed*
Not installed
Installed
HA PAD
Not connected
Connected to VDD
LA PAD
Not connected
Connected to GND
Not connected
Connected to GND
MAX5389 FUNCTION
Potentiometer open-ended
Potentiometer with GND reference
Voltage-divider open-ended
Voltage-divider with GND reference
Table 5. JU10 and JU11 Jumper Functions (Potentiometer B)
SHUNT POSITION
JU10
Not installed*
Installed
*Default
position.
4
______________________________________________________________________________________
JU11
Not installed
Installed*
Not installed
Installed
HB PAD
Not connected
Connected to VDD
LB PAD
Not connected
Connected to GND
Not connected
Connected to GND
MAX5389 FUNCTION
Potentiometer open-ended
Potentiometer with GND reference
Voltage-divider open-ended
Voltage-divider with GND reference
MAX5389 Evaluation Kit
Evaluates: MAX5389
Figure 1. MAX5389 EV Kit Schematic
_______________________________________________________________________________________
5
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