MAX5478EVKIT Maxim Integrated, MAX5478EVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX5478EVKIT
• Description: Digital Potentiometer ICs Evaluation Kit/Evaluation System for the MAX5477/MAX5478/MAX5479
• Manufacturer: Maxim Integrated

Specifications of MAX5478EVKIT

• Resistance: 50 kOhms
• Number Of Pots: Dual
• Taps Per Pot: 256
• Wiper Memory: Non Volatile
• Digital Interface: Serial (2-Wire, I2C)
• Operating Supply Voltage: 5 V
• Supply Current: 15 uA
• Supply Voltage - Max: 5.25 V
• Supply Voltage - Min: 2.7 V

Table 1. Device Address Configuration
tion during power-up. The I
can communicate at rates up to 400kbps to program the
nonvolatile and the volatile memory of the MAX5478.
The MAX5478 features three configurable input
address pins (A0, A1, and A2) that set the device
address to one of up to eight unique address combina-
tions. The MAX5478 EV kit can also be used to evaluate
the 10kΩ MAX5477 or the 100kΩ MAX5479 dual digital
potentiometers. IC replacement is required to evaluate
the other digital potentiometers.
The MAX5478 EV kit circuit features three jumpers that
pull the MAX5478 A0, A1, and A2 address pins to VDD or
GND to set the MAX5478 slave address. See Table 1 for
jumper JU1 (A0), JU2 (A1), and JU3 (A2) settings to set
the MAX5478 slave address.
Note: The first 7 bits shown are the address. The Y bit
in Table 1 is the I
states that this bit is a 1 for a read operation or a 0 for a
write. The Y bit is always set to 0 (write only) because
these digital potentiometers do not transmit data to the
master device.
The MAX5478 IC features a write-protect input pin (WP)
that enables or disables the I
the nonvolatile and volatile memory. The WP pin can be
configured using jumper JU4. See Table 2 for jumper
JU4 settings.
Table 2. Jumper JU4 Configuration (WP)
SHUNT POSITION
JU3 (A2) SHUNT POSITION
1-2
2-3
MAX5478 Evaluation Kit/Evaluation System
2-3
2-3
2-3
2-3
1-2
1-2
1-2
1-2
_______________________________________________________________________________________
2
Connected to GND
Connected to VDD
C read/write bit. The I
WP PIN
2
C-compatible serial interface
JU2 (A1) SHUNT POSITION
2
C interface from writing to
Address Selection
Write Protect
WRITE PROTECT
2-3
2-3
1-2
1-2
2-3
2-3
1-2
1-2
Disabled
Enabled
2
C protocol
JU1 (A0) SHUNT POSITION
The MAX5478 EV kit features a 2 x 10, right-angle head-
er receptacle (J1) to interface with the CMODUSB com-
mand module. Pin J1-7 connects to the MAX5478 clock
pin (SCL) and pin J1-3 connects to the MAX5478 data
pin (SDA) for I
both SW1 dip switches on the command module to the
ON position to connect pullup resistors to the SCL and
SDA signal lines for proper I
The clock and data input pins can also be accessed at
the SCL and SDA EV kit pads, respectively. An external
I
SDA, and GND pads to communicate with the MAX5478
IC. If the external device does not have pullup resistors
on the clock and data lines, 2.4kΩ (typ) pullup surface-
mount resistors (0805 size) must be installed on resistor
R1 and R2 pads for proper I
pad must also be connected to the external I
The MAX5478 dual digital potentiometer high (HA, HB),
low (LA, LB), and wiper (WA, WB) pins can be
accessed at the EV kit’s HA, HB, LA, LB, WA, and WB
pads. Suffixes A and B denote the pads for digital
potentiometer A and digital potentiometer B in the
MAX5478 IC. Jumpers JU6 and JU7 can be used to
connect the MAX5478 LA and LB pins to the circuit
ground, providing a ground reference during evaluation.
2
C-compatible controller can be connected to the SCL,
2-3
1-2
2-3
1-2
2-3
1-2
2-3
1-2
2
C-compatibale communications. Slide
Digital Potentiometer Pins
I
2
C Clock and Data Inputs
0101 000Y
0101 001Y
0101 010Y
0101 011Y
0101 100Y
0101 101Y
0101 110Y
0101 111Y
BINARY
2
2
C communication.
C communication. The GND
MAX5478 ADDRESS
HEXADECIMAL
2
C controller.
0x5A
0x5C
0x50
0x52
0x54
0x56
0x58
0x5E
3