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MAX5432 Evaluation Kit
Detailed Description of Hardware
The MAX5432 EV kit is an assembled and tested PCB
that evaluates the MAX5432 linear digital potentiometer.
The MAX5432 has an end-to-end resistance of 50k Ω and
the wiper can be programmed among 32 tap positions.
The MAX5432 features an internal nonvolatile memory
(EEPROM) used to store the wiper position for initializa-
tion during power-up. The on-board I 2 C-compatible seri-
al interface can communicate at rates up to 400kbps to
program the MAX5432.
The EV kit uses a MAX5432 IC in an 8-pin TDFN pack-
age on a proven 2-layer PCB design. The MAX5432 EV
kit provides two options to power the MAX5432 IC. It can
operate from the 3.3V supply generated from the USB
interface circuit, or from a user-supplied 2.7V to 5.25V
external DC power supply. The MAX1840 logic level
translators (U7, U8) provide proper I 2 C-interface opera-
tion when using a 2.7V to 5.25V external power supply.
Jumper Selection
Using an External DC Power Supply
The MAX5432 EV kit can be powered by an external
2.7V to 5.25V DC power supply. The EV kit can still be
programmed through the USB interface using the soft-
ware GUI. To connect the EV kit to an external power
supply, disconnect the USB cable and install a shunt
on pins 2-3 of jumper JU1. Turn off the power supply
and connect the power-supply ground terminal to the
Table 2. JU1 Jumper Functions (VDD)
EV kit GND pad; connect the power-supply positive ter-
minal to the VIN pad. Table 2 lists the various options
for powering the MAX5432 EV kit.
I 2 C Clock and Data Inputs
The MAX5432 features clock and data input pins for
I 2 C-compatible communication to control the MAX5432
wiper position. The clock and data input pins are driven
by the on-board USB interface circuit or the PCB pads,
along with the user-supplied external I 2 C-compatible
controller. An external I 2 C-compatible controller can be
connected to the SCL, SDA, and GND pads to commu-
nicate with the MAX5432 IC.
Jumpers JU2 and JU3 select the I 2 C serial-interface
signal-control sources for the MAX5432 IC. Table 3 lists the
various options for configuring I 2 C input signal controls.
Address Selection (A0)
The MAX5432 EV kit circuit features a jumper that pulls
the MAX5432 A0 address pin to VDD or GND to set the
slave address. Table 4 shows four possible slave
addresses for the MAX5432. The first 4 bits (MSBs) of
the slave addresses are always 0101. Bits A2 and A1 are
factory programmed (refer to the MAX5432/MAX5433 IC
data sheet). Connect the A0 input to either GND or VDD
to select the I 2 C device address for the MAX5432. When
using multiple devices, each device must have a unique
address to share the I 2 C bus. A maximum of four
devices can concurrently share the same bus.
Table 3. JU2 and JU3 Jumper Functions
(SCL, SDA)
SHUNT VDD PIN
POSITION CONNECTED TO
1-2* 3.3V
EV KIT POWERED FROM
USB interface circuit
SHUNT
POSITION
I 2 C INTERFACE
CONTROL SIGNALS
CONNECTED TO
I 2 C INTERFACE
SIGNALS
CONTROLLED BY
2-3
Open
VIN
Not connected
External power supply (2.7V
to 5.25V)
Do not use (EV kit will not be
powered)
Installed*
Not
installed
USB interface circuit
PCB pads
USB interface circuit and
EV kit software
User-supplied external
I 2 C interface signals
*Default position.
Table 4. JU4 Jumper Functions (A0)
*Default position.
SHUNT POSITION
A0 PIN CONNECTED TO
BINARY
ADDRESS
HEX
PART
Installed*
Not installed
Installed
Not installed
GND
VDD (through resistor R12)
GND
VDD (through resistor R12)
010100A 0 Y
010100A 0 Y
010110A 0 Y
010110A 0 Y
0x50
0x52
0x58
0x5A
MAX5432 L ETA or
MAX5433 L ETA
MAX5432 M ETA or
MAX5433 M ETA
*Default position.
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相关代理商/技术参数
MAX5432LETA 制造商:Maxim Integrated Products 功能描述:32-TAP NONVOLATILE I2C LINEAR D - Rail/Tube
MAX5432LETA+ 制造商:Maxim Integrated Products 功能描述:DGTL POTENTIOMETER 32POS 50KOHM SGL 8TDFN EP - Rail/Tube
MAX5432LETA+T 功能描述:数字电位计 IC 32-Tap Nonvolatile I2C Linear RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel
MAX5432LETA-T 功能描述:数字电位计 IC RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel
MAX5432META 制造商:Maxim Integrated Products 功能描述:32-TAP NONVOLATILE I2C LINEAR D - Rail/Tube
MAX5432META+ 制造商:Maxim Integrated Products 功能描述:DGTL POTENTIOMETER 32POS 50KOHM SGL 8TDFN EP - Rail/Tube
MAX5432META+T 功能描述:数字电位计 IC 32-Tap Nonvolatile I2C Linear RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel
MAX5432META-T 功能描述:数字电位计 IC RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel