Datasheet
MAX5392 Evaluation System
Evaluates: MAX5387/MAX5392
______________________________________________________________________________________ 11
I
2
C Clock and Data Inputs
The MAX5392 features a clock and data input pins for
I
2
C-compatible communication to control the MAX5392M
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
2
C-compatible controller. An external I
2
C-compatible
controller can be connected to SDA (J1-3), SCL (J1-5),
and GND (J1-2, J1-4, J1-6) on header J1 to commu-
nicate with the MAX5392 ICs. When using an external
I
2
C-compatible controller, verify that the MINIQUSB+
interface board has been disconnected from the EV
kit J2 and J3 headers. See Table 8 for header J1 pin
assignment.
The EV kit requires minor alterations when using an
external I
2
C-compatible controller connected at J1:
1) Disconnect the MINIQUSB+ interface board from the
EV kit.
2) Remove resistors R6 and R9, located at level transla-
tors U7 and U8 I/0 inputs.
Potentiometer, Voltage-Divider or
Variable Resistor, with Ground Reference
The EV kit provides an option to configure the MAX5392
as a potentiometer or voltage-divider, open end or with
ground reference, respectively. Use jumpers JU11 and
JU12 for potentiometer A and jumpers JU13 and JU14
for potentiometer B configuration when evaluating U3.
See Tables 9 and 10 for jumper options for configuring
U3 potentiomers A and B. Use jumpers JU23 and JU24
for potentiometer A and jumpers JU25 and JU26 for
potentiometer B configuration when evaluating U4. See
Tables 11 and 12 for the jumper options for configuring
U4 potentiometers A and B.
The MAX5392M IC 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
MAX5392 IC data sheet.
Note: To test the device in resistor mode, the ohmmeter
must be GND referenced to the MAX5392. This can be
accomplished by connecting the L_ pin to GND or the
H_ pin to U3 and U4 respective VDD inputs. Resistance
can then be measured between W_ and L_ or W_ and
H_PCB pads.
Table 8. Header J1 Pin Assignment
*Default position.
*Default position.
Table 9. JU11 and JU12 Jumper Functions (U3 Potentiometer A)
Table 10. JU13 and JU14 Jumper Functions (U3 Potentiometer B)
SHUNT POSITION
HA PAD LA PAD MAX5392 FUNCTION
JU11 JU12
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
PIN SIGNAL
J1-1 VDD
J1-2, J1-4, J1-6 GND
J1-3 SDA
J1-5 SCL
SHUNT POSITION
HB PAD LB PAD MAX5392 FUNCTION
JU13 JU14
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