MAX5387EVKIT+ Maxim Integrated, MAX5387EVKIT+ Datasheet - Page 9

• Manufacturer Part Number: MAX5387EVKIT+
• Description: Digital Potentiometer Development Tools Maxim Evaluation Kit
• Manufacturer: Maxim Integrated

Specifications of MAX5387EVKIT+

• Product: Evaluation Kits
• Tool Is For Evaluation Of: MAX5387
• Resistance: 10 kOhms
• Operating Supply Voltage: 2.6 V to 5.5 V
• Description/function: Dual Low Voltage Digital Potentiometer
• Interface Type: 2 Wire, Serial

interface board circuitry and 2.6V using LDO regulator
U6. The VPOWER rails set both MAX5387 VDD inputs to
5V, 3.3V, or 2.6V. LDO regulator U5 is provided to set the
MAX5392 (U3, U4) VDD inputs to 1.7V when evaluating
the MAX5392. Refer to the MAX5392 evaluation system
data sheet for additional information.
Alternatively, the EV kit VDD and GND PCB pads can
be used to supply an external 2.6V to 5.25V to the
circuit’s VPOWER rail, when evaluating the MAX5387,
by removing the shunt at jumper JU1. See Table 3 for
proper JU1 configuration for VPOWER when evaluating
the MAX5387.
The EV kit circuit feature three jumpers that pull the
MAX5387 (U1) A2, A1, and A0 address pins to VDD or
GND to set the MAX5387 slave address. See Table 4 for
jumpers JU7 (A2), JU8 (A1), and JU9 (A0) settings to set
the U1 slave address.
Note: The first 7 bits shown are the address. The Y bit
in Table 4 is the I
states that this bit is a 1 for a read operation, or a 9 for
a write operation. The Y bit is always set to 0 (write only)
because these digital potentiometers do not transmit
data to the master device.
Table 3. VDD Input Source (JU1)
Table 4. Device Address Selection
(JU7, JU8, JU9)
Note: If component U2 and U4 are installed on the EV kit, the
U1 device address should not be set to 0x52 or 0x5A.
JU7
2-3
2-3
2-3
2-3
1-2
1-2
1-2
1-2
SHUNT POSITION
SHUNT POSITION
Address Selection for the MAX5387 (U1)
Not installed
JU8
2-3
2-3
1-2
1-2
2-3
2-3
1-2
1-2
1-2
1-3
1-4
JU9
2-3
1-2
2-3
1-2
2-3
1-2
2-3
1-2
_______________________________________________________________________________________
2
C read/write bit. The I
0101 000Y
0101 001Y
0101 010Y
0101 011Y
0101 100Y
0101 101Y
0101 110Y
0101 111Y
BINARY
External source applied at the EV kit VDD and
MAX5387 ADDRESS
3.3V ( MINIQUSB+ circuitry)
5V (MINIQUSB+ circuitry)
VPOWER SOURCE
HEXADECIMAL
GND PCB pads
2.6V (LDO U6)
2
C protocol
0x5A
0x5C
0x5E
0x50
0x52
0x54
0x56
0x58
MAX5387 Evaluation System
The MAX5387 features clock and data input pins for I
compatible communication to control the MAX5387 wiper
position. The clock and data input pins can be driven by
the MINIQUSB+ interface circuit or the PCB header (J1),
along with a user-supplied external I
troller. An external I
nected to SDA (J1-3), SCL (J1-5), and GND (J1-2, J1-4,
J1-6) on header J1 to communicate with the MAX5387
IC. When using an external I
verify that the MINIQUSB+ interface board has been
disconnected from the EV kit’s J2 and J3 headers. See
Table 5 for header J1 pin assignments.
The EV kit requires minor alterations when using an
external I
1) Disconnect the MINIQUSB+ interface board from the
2) Remove resistors R6 and R9, which are located at level
The EV kit provides an option to configure the MAX5387
as a potentiometer or voltage-divider, open-ended or
with ground reference, respectively. Use jumpers JU3
Table 5. Header J1 Pin Assignments
Potentiometer, Voltage-Divider or Variable Resistor,
EV kit.
translators U7 and U8 IO inputs.
J1-2, J1-4, J1-6
2
C-compatible controller connected at J1:
J1-1
J1-3
J1-5
PIN
External source applied at the EV kit VDD and
2
C-compatible controller can be con-
MAX5387 VDD PINS
GND PCB pads
I
2
C Clock and Data Inputs
2
3.3V
2.6V
C-compatible controller,
with Ground Reference
5V
2
C-compatible con-
SIGNAL
GND
VDD
SDA
SCL
2
C-
9