MAX5386MEVMINIQU+ Maxim Integrated, MAX5386MEVMINIQU+ Datasheet - Page 8

• Manufacturer Part Number: MAX5386MEVMINIQU+
• Description: Digital Potentiometer ICs MAX5386/88/91/93 Eval Kit
• Manufacturer: Maxim Integrated

Specifications of MAX5386MEVMINIQU+

• Rohs: yes
• Resistance: 10 kOhms
• Temperature Coefficient: 35 PPM / C
• Tolerance: 25 %
• Number Of Pots: Dual
• Taps Per Pot: 256
• Wiper Memory: Volatile
• Digital Interface: Serial (3-Wire, SPI)
• Description/function: Dual Volatile Low Voltage Linear Taper Digital Potentiometer
• Operating Supply Voltage: 2.6 V to 5.5 V
• Supply Current: 1 uA
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 2.6 V

MAX5386M Evaluation System
The VPOWER rail is typically supplied as 3.3V or 5V by
the MINIQUSB+ interface board circuitry, or 2.6V using
LDO regulator U6. LDO regulator U5 output is set to 1.7V
and is powered from the VPOWER rail. The VPOWER rail
sets the MAX5386M VDD input to 5V, 3.3V, or 2.6V.
Regulator U5 has an adjustable output that can be con-
figured to a different voltage by replacing resistor R1.
Use the following equation to set U5 output voltage:
where R1 is in ohms and VOUT is the desired U5 output
voltage.
Jumper JU20 selects the source for the EV kit circuit
VPOWER rail. See Table 3 for proper jumper configura-
tion for setting VPOWER rail.
Alternatively, the EV kit’s VDD PCB pad can be used to
supply an external 2.6V to 5.25V to the circuit’s VPOWER
rail, by removing the shunt at jumper JU20.
Table_3._VPOWER_Rail_(JU20)
*Default position.
Table_4._U5_LDO_Function_(JU1)
*Default position.
Table_5._MAX5386M_Power_Source_(JU2,_JU1,_JU20)
*Default position.
X = Don’t care.
8_ _ _______________________________________________________________________________________
SHUNT_POSITION
Not installed
SHUNT_POSITION
JU2
2-3*
1-2
1-2
Not installed*
1-3*
1-2
1-4
Installed
R1 10 x
SHUNT_POSITION
=
Not installed
Installed
External source applied at EV kit
JU1
5
EV Kit VDD Input Source
X
3.3V (MINIQUSB+ circuitry)
5V (MINIQUSB+ circuitry)
VDD and GND PCB pads



VOUT
1.225
VPOWER_Rail
2.6V (LDO U6)
U5_1.7V_OUTPUT
−
1
Not installed



Disabled
Enabled
JU20
1-3*
1-2
1-4
X
X
External source applied at the EV kit VDD and GND PCB pads
Jumper JU1 enables/disables LDO U5 output. Install a
shunt across jumper JU1 to enable U5 default 1.7V out-
put. Remove the shunt at JU1 to disable U5 output. See
Table 4 for proper jumper JU1configuration.
Jumper JU2 selects the power source for the MAX5386M
VDD input. Install a shunt across pins 1-2 of jumper JU7
to operate the MAX5386M VDD input power using LDO
U5 output. Install a shunt across pins 2-3 to operate the
MAX5386M VDD input from the VPOWER rail. See Table
5 for proper jumper configuration for the MAX5386M
VDD power-supply input.
Note: The MAX5386M VDD input has a minimum 2.6V
requirement and LDO U5 output needs to be adjusted to
power the MAX5386M VDD input.
The MAX5386M features clock, data-, and chip-select
input pins for SPI-compatible communication to control
the MAX5386M wiper position. The clock, data-, and
chip-select pins can be driven by the MINIQUSB+ inter-
face circuit or the PCB header (J1), along with a user-
supplied external SPI-compatible controller. An external
SPI-compatible controller can be connected to CS
(J1-3), DIN (J1-5), SCLK (J1-7), and GND (J1-2, J1-4,
J1-6, J1-8) on header J1 to communicate with the
MAX5386M IC. When using an external SPI-compatible
controller, verify that the MINIQUSB+ interface board
has been disconnected from the EV kit’s J2 and J3 head-
ers. See Table 6 for header J1 pin assignment.
1.7V or adjusted U5 LDO output
MAX5386M VDD Input Configuration
MAX5386M_VDD_PIN
SPI Clock, Data-, and Chip-Select Inputs
Not powered
3.3V
2.6V
5V