MAX5435PEZT-T [MAXIM]
32-Tap, Nonvolatile, I2C, Linear, Digital Potentiometers; 32抽头，非易失， I²C ，线性，数字电位器
| 型号： | MAX5435PEZT-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 32-Tap, Nonvolatile, I2C, Linear, Digital Potentiometers |
| 文件： | 总17页 (文件大小：368K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3511; Rev 1; 12/04
2
32-Tap, Nonvolatile, I C, Linear, Digital
Potentiometers
General Description
Features
The MAX5432–MAX5435 nonvolatile, linear-taper, digi-
tal potentiometers perform the function of a mechanical
potentiometer, but replace the mechanics with a simple
2-wire serial interface. Each device performs the same
function as a discrete potentiometer or a variable resis-
tor and has 32 tap points.
♦ Tiny 3mm x 3mm 8-Pin TDFN and 6-Pin Thin
SOT23 Packages
♦ Power-On Recall of Wiper Position from
Nonvolatile Memory
♦ 35ppm/°C End-to-End Resistance Temperature
Coefficient
The MAX5432–MAX5435 feature an internal, nonvolatile,
electrically erasable programmable read-only memory
(EEPROM) that returns the wiper to its previously stored
position at power-up. The fast-mode I2C†-compatible
serial interface allows communication at data rates up to
400kbps, minimizing board space and reducing inter-
connection complexity. Each device is available with
one of four factory-preset I2C addresses (see the
Selector Guide).
♦ 5ppm/°C Ratiometric Temperature Coefficient
♦ 50kΩ/100kΩ Resistor Values
♦ Fast 400kbps I2C-Compatible Serial Interface
♦ 500nA (typ) Static Supply Current
♦ +2.7V to +5.25V Single-Supply Operation
♦ 32 Tap Positions
♦
0.15 ꢀSꢁ INꢀ (typ)ꢂ 0.15 ꢀSꢁ DNꢀ (typ)
Use the MAX5432–MAX5435 in applications requiring
digitally controlled resistors. Two resistance values are
available (50kΩ and 100kΩ) in a voltage-divider or vari-
able resistor configuration. The nominal resistor temper-
ature coefficient is 35ppm/°C end-to-end, and only
5ppm/°C ratiometric, making the devices ideal for
applications requiring a low-temperature-coefficient
variable resistor such as low-drift, programmable-gain
amplifier circuit configurations.
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
MAX5432LETA
8 TDFN-EP**
MAX5432META*
MAX5433LETA
8 TDFN-EP**
8 TDFN-EP**
MAX5433META*
MAX5434LEZT-T
MAX5434MEZT-T*
MAX5434NEZT-T*
MAX5434PEZT-T*
MAX5435LEZT-T
MAX5435MEZT-T*
MAX5435NEZT-T*
MAX5435PEZT-T*
8 TDFN-EP**
The MAX5432/MAX5433 are available in a 3mm x 3mm 8-
pin TDFN package and the MAX5434/MAX5435 are avail-
able in a 6-pin thin SOT23 package. The MAX5432–
MAX5435 are specified over the extended (-40°C to
+85°C) temperature range.
6 Thin SOT23-6
6 Thin SOT23-6
6 Thin SOT23-6
6 Thin SOT23-6
6 Thin SOT23-6
6 Thin SOT23-6
6 Thin SOT23-6
6 Thin SOT23-6
Applications
Mechanical Potentiometer Replacement
Low-Drift Programmable-Gain Amplifiers
Volume Control
*Future product—contact factory for availability.
**EP = Exposed pad.
Liquid-Crystal Display (LCD) Screen Adjustment
Pin Configurations
TOP VIEW
Selector Guide appears at end of data sheet.
H
SDA
GND
SCL
1
2
3
4
8
7
6
5
W
L
V
1
2
3
6
5
4
L
DD
GND
SCL
W
†Purchase of I2C components from Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys
a license under the Philips I2C Patent Rights to use these com-
ponents in an I2C system, provided that the system conforms
to the I2C Standard Specification as defined by Philips.
A0
V
SDA
MAX5432
MAX5433
MAX5434
MAX5435
DD
SOT23
TDFN
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
2
32-Tap, Nonvolatile, I C, Linear, Digital
Potentiometers
AꢁSOꢀUTE MAXIMUM RATINGS
DD
V
to GND...........................................................-0.3V to +6.0V
Continuous Power Dissipation (T = +70°C)
A
SDA, SCL to GND..................................................-0.3V to +6.0V
6-Pin Thin SOT23 (derate 9.1mW/°C above +70°C)....727mW
8-Pin TDFN (derate 18.2mW/°C above +70°C) ......1454.5mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
A0, H, L, and W to GND .............................-0.3V to (V
Maximum Continuous Current into H, L, and W
+ 0.3V)
DD
MAX5432/MAX5434..................................................... 1.3mA
MAX5433/MAX5435..................................................... 0.6mA
Input/Output Latchup Immunity........................................ 50mA
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
EꢀECTRICAꢀ CHARACTERISTICS
(V
= +2.7V to +5.25V, V = V , V = GND, T = -40°C to +85°C, unless otherwise noted. Typical values are at V
= +5V, T =
DD A
DD
H
DD
L
A
+25°C.) (Note 1)
PARAMETER
SYMꢁOꢀ
CONDITIONS
MIN
TYP
MAX
UNITS
DC PERFORMANCE
Resolution
32
37.5
75
Taps
MAX5432/MAX5434
50
62.5
125
End-to-End Resistance
R
kΩ
H-L
MAX5433/MAX5435
100
End-to-End Resistance
Temperature Coefficient
TC
35
5
ppm/°C
ppm/°C
R
Ratiometric Resistance
Temperature Coefficient
V
V
V
V
= 5V
= 3V
= 5V
= 3V
0.15
0.15
0.15
0.15
0.5
0.5
0.5
0.5
DD
DD
DD
DD
Variable resistor (Note 2)
Integral Nonlinearity
INL
LSB
Voltage-divider,
MAX5432/MAX5433 (Note 3)
V
V
V
V
= 5V
= 3V
= 5V
= 3V
0.15
0.15
0.15
0.15
0.5
0.5
DD
DD
DD
DD
Variable resistor (Note 2)
Differential Nonlinearity
DNL
LSB
LSB
0.5
Voltage-divider,
MAX5432/MAX5433 (Note 3)
0.5
MAX5432, 50kΩ
-0.5
-0.5
+0.5
+0.5
1200
Full-Scale Error (Note 4)
Zero-Scale Error (Note 5)
MAX5433, 100kΩ
MAX5432, 50kΩ
LSB
MAX5433, 100kΩ
MAX5432/MAX5433 (Note 6)
Wiper Resistance
R
610
Ω
W
DIGITAꢀ INPUTS
0.7 x
Input High Voltage
Input Low Voltage
V
(Note 7)
(Note 7)
V
V
IH
V
DD
0.3 x
V
IL
V
DD
Input Leakage Current
Input Capacitance
I
1
µA
pF
LEAK
5
2
_______________________________________________________________________________________
2
32-Tap, Nonvolatile, I C, Linear, Digital
Potentiometers
EꢀECTRICAꢀ CHARACTERISTICS (continued)
(V
= +2.7V to +5.25V, V = V , V = GND, T = -40°C to +85°C, unless otherwise noted. Typical values are at V
= +5V, T =
DD A
DD
H
DD
L
A
+25°C.) (Note 1)
PARAMETER
SYMꢁOꢀ
CONDITIONS
MIN
TYP
MAX
UNITS
DYNAMIC CHARACTERISTICS
MAX5432/MAX5434
500
250
0.5
-3dB Bandwidth (Note 8)
kHz
µs
MAX5433/MAX5435
MAX5432/MAX5434
MAX5433/MAX5435
Wiper Settling Time (Note 9)
1.0
NONVOꢀATIꢀE MEMORY REꢀIAꢁIꢀITY
Data Retention
T
A
T
A
T
A
= +85°C
= +25°C
= +85°C
50
Years
200,000
50,000
Endurance
Stores
POWER SUPPꢀY
Power-Supply Voltage
Standby Current
V
2.70
5.25
2
V
DD
I
Digital inputs = V or GND, T = +25°C
0.5
µA
DD
DD
A
During nonvolatile write; digital inputs =
or GND (Note 10)
Programming Current
200
900
µA
V
DD
TIMING CHARACTERISTICS
(V
= +2.7V to +5.25V, V = V , V = GND, T = -40°C to +85°C, unless otherwise noted. Typical values are at V
= +5V, T
=
DD
H
DD
L
A
DD
A
+25°C.) (Figures 1 and 2) (Note 11)
PARAMETER
SCL Clock Frequency
Setup Time for START Condition
Hold Time for START Condition
CLK High Time
SYMꢁOꢀ
CONDITIONS
MIN
TYP
MAX
UNITS
kHz
µs
f
400
SCL
t
0.6
0.6
0.6
1.3
100
0
SU-STA
HD-STA
t
µs
t
µs
HIGH
CLK Low Time
t
µs
LOW
Data Setup Time
t
ns
SU-DAT
HD-DAT
Data Hold Time
t
0.9
300
300
µs
SDA, SCL Rise Time
SDA, SCL Fall Time
t
ns
R
t
ns
F
Setup Time for STOP Condition
t
0.6
1.3
µs
SU-STO
Bus Free Time Between STOP
and START Condition
t
µs
ns
pF
BUF
Pulse Width of Spike Suppressed
t
50
SP
Capacitive Load for Each Bus
Line
C
(Note 12)
400
B
Idle time required after a nonvolatile
memory write (Note 13)
Nonvolatile Store Time
12
ms
Note 1: All devices are production tested at T = +25°C and are guaranteed by design and characterization for -40°C < T < +85°C.
A
A
_______________________________________________________________________________________
3
2
32-Tap, Nonvolatile, I C, Linear, Digital
Potentiometers
TIMING CHARACTERISTICS (continued)
(V
= +2.7V to +5.25V, V = V , V = GND, T = -40°C to +85°C, unless otherwise noted. Typical values are at V
= +5V, T =
DD A
DD
H
DD
L
A
+25°C.) (Figures 1 and 2) (Note 1)
Note 2: The DNL and INL are measured with the potentiometer configured as a variable resistor. For the 3-terminal potentiometers
(MAX5432/MAX5433), H is unconnected and L = GND. At V = 5V, W is driven with a source current of 80µA for the 50kΩ
DD
configuration, and 40µA for the 100kΩ configuration. At V
configuration, and 20µA for the 100kΩ configuration.
= 3V, W is driven with a source current of 40µA for the 50kΩ
DD
Note 3: The DNL and INL are measured with the potentiometer configured as a voltage-divider with H = V
and L = GND
DD
(MAX5432/MAX5433 only). The wiper terminal is unloaded and measured with an ideal voltmeter.
V
-V
H
W
.
V
⎛
⎞
H
Note 4: Full-scale error is defined as
Note 5: Zero-scale error is defined as
⎜
⎟
⎠
⎝
31
V
-V
L
W
.
V
⎛
⎞
H
⎜
⎟
⎠
⎝
31
Note 6: The wiper resistance is the worst value measured by injecting the currents given in Note 2 into W with L = GND.
= (V - V ) / I .
R
W
W
H
W
Note 7: The device draws current in excess of the specified supply current when the digital inputs are driven with voltages between
(V - 0.5V) and (GND + 0.5V). See the Supply Current vs. Digital Input Voltage graph in the Typical Operating Characteristics.
DD
Note 8: Wiper is at midscale with a 10pF capacitive load. Potentiometer set to midscale, L = GND, an AC source is applied to H,
and the output is measured as 3dB lower than the DC W/H value in dB.
Note 9: This is measured from the STOP pulse to the time it takes the output to reach 50% of the output step size (divider mode). It
is measured with a maximum external capacitive load of 10pF.
Note 10:The programming current exists only during NV writes (12ms typ).
Note 11:Digital timing is guaranteed by design and characterization, and is not production tested.
Note 12:An appropriate bus pullup resistance must be selected depending on board capacitance. Refer to the I2C-bus specifica-
tion document linked to this web address: www.semiconductors.philips.com/acrobat/literature/9398/39340011.pdf
Note 13:The idle time begins from the initiation of the stop pulse.
Typical Operating Characteristics
(V
DD
= +5V, T = +25°C, unless otherwise noted.)
A
STANDBY SUPPLY CURRENT
vs. TEMPERATURE
SUPPLY CURRENT
vs. DIGITAL INPUT VOLTAGE
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
1000
100
10
1.5
1.0
DIGITAL INPUTS = GND OR V
DD
DIGITAL INPUTS = GND OR V
DD
V
= 5V
DD
1.2
0.8
0.6
0.4
0.2
0
0.9
0.6
0.3
0
V
= 5V
DD
V
= 3V
DD
V
= 3V
DD
1
0.1
4
-40
-15
10
35
60
85
0
1
2
3
5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
TEMPERATURE (°C)
DIGITAL INPUT VOLTAGE (V)
SUPPLY VOLTAGE (V)
4
_______________________________________________________________________________________
2
32-Tap, Nonvolatile, I C, Linear, Digital
Potentiometers
Typical Operating Characteristics (continued)
(V
DD
= +5V, T = +25°C, unless otherwise noted.)
A
TAP-TO-TAP SWITCHING TRANSIENT
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
(0 TO MIDSCALE, C = 10pF)
L
MAX5432–35 toc06
1.0
0.5
0
1.0
0.5
0
50kΩ
100kΩ
SDA
2V/div
V
W
1V/div
-0.5
-1.0
-0.5
-1.0
50kΩ
-40
-15
10
35
60
85
1µs/div
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TAP-TO-TAP SWITCHING TRANSIENT
(0 TO MIDSCALE, C = 10pF)
MIDSCALE WIPER TRANSIENT
WIPER TRANSIENT AT POWER-ON
AT POWER-ON
L
MAX5432–35 toc08
MAX5432–35 toc09
MAX5432–35 toc07
V
DD
SDA
2V/div
2V/div
V
DD
2V/div
V
V
W
V
W
W
1V/div
1V/div
1V/div
50kΩ
100kΩ
100kΩ
10µs/div
10µs/div
1µs/div
MIDSCALE WIPER RESPONSE
vs. FREQUENCY
MIDSCALE WIPER RESPONSE
vs. FREQUENCY (MAX5433)
WIPER RESISTANCE vs. TAP POSITION
(MAX5432)
(MAX5432)
0
-3
700
600
500
400
300
200
100
0
0
-3
V
DD
= 3V
C
W
= 10pF
C
W
= 10pF
-6
-6
-9
-9
C
W
= 33pF
C
W
= 33pF
-12
-15
-18
-12
-15
-18
0.1
1
10
FREQUENCY (kHz)
100
1000
0
4
8
12 16 20 24 28 31
TAP POSITION
0.1
1
10
FREQUENCY (kHz)
100
1000
_______________________________________________________________________________________
5
2
32-Tap, Nonvolatile, I C, Linear, Digital
Potentiometers
Typical Operating Characteristics (continued)
(V
DD
= +5V, T = +25°C, unless otherwise noted.)
A
WIPER RESISTANCE vs. TAP POSITION
WIPER RESISTANCE vs. TAP POSITION
WIPER RESISTANCE vs. TAP POSITION
(MAX5432)
(MAX5433)
(MAX5433)
700
700
600
500
400
300
200
100
0
700
V = 5V
DD
V
DD
= 3V
V
= 5V
DD
600
500
400
300
200
100
0
600
500
400
300
200
100
0
0
4
8
12 16 20 24 28 31
TAP POSITION
0
4
8
12 16 20 24 28 31
TAP POSITION
0
4
8
12 16 20 24 28 31
TAP POSITION
RESISTANCE DNL vs. TAP POSITION
RESISTANCE INL vs. TAP POSITION
W-TO-L RESISTANCE vs. TAP POSITION
0.5
0.5
0.4
120
110
100
VARIABLE-RESISTOR MODE
MAX5432/MAX5434
VARIABLE-RESISTOR MODE
MAX5432/MAX5434
0.4
0.3
0.3
90
80
70
0.2
0.2
0.1
0.1
100kΩ
0
0
60
50
40
30
20
10
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.1
-0.2
-0.3
-0.4
-0.5
50kΩ
0
4
8
12 16 20 24 28 31
TAP POSITION
0
4
8
12 16 20 24 28 31
TAP POSITION
0
4
8
12 16 20 24 28 31
TAP POSITION
6
_______________________________________________________________________________________
2
32-Tap, Nonvolatile, I C, Linear, Digital
Potentiometers
Typical Operating Characteristics (continued)
(V
DD
= +5V, T = +25°C, unless otherwise noted.)
A
RESISTANCE DNL vs. TAP POSITION
RESISTANCE INL vs. TAP POSITION
RESISTANCE DNL vs. TAP POSITION
0.5
0.5
0.4
0.5
0.4
VARIABLE-RESISTOR MODE
MAX5433/MAX5435
VOLTAGE-DIVIDER MODE
MAX5432
VOLTAGE-DIVIDER MODE
MAX5432
0.4
0.3
0.3
0.3
0.2
0.2
0.2
0.1
0.1
0.1
0
0
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.1
-0.2
-0.3
-0.4
-0.5
-0.1
-0.2
-0.3
-0.4
-0.5
0
4
8
12 16 20 24 28 31
TAP POSITION
0
4
8
12 16 20 24 28 31
TAP POSITION
0
4
8
12 16 20 24 28 31
TAP POSITION
RESISTANCE INL vs. TAP POSITION
RESISTANCE DNL vs. TAP POSITION
RESISTANCE INL vs. TAP POSITION
0.5
0.4
0.5
0.4
0.5
0.4
VOLTAGE-DIVIDER MODE
MAX5433
VOLTAGE-DIVIDER MODE
MAX5433
VARIABLE-RESISTOR MODE
MAX5433/MAX5435
0.3
0.3
0.3
0.2
0.2
0.2
0.1
0.1
0.1
0
0
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.1
-0.2
-0.3
-0.4
-0.5
-0.1
-0.2
-0.3
-0.4
-0.5
0
4
8
12 16 20 24 28 31
TAP POSITION
0
4
8
12 16 20 24 28 31
TAP POSITION
0
4
8
12 16 20 24 28 31
TAP POSITION
_______________________________________________________________________________________
7
2
32-Tap, Nonvolatile, I C, Linear, Digital
Potentiometers
Pin Description
PIN
THIN SOT23
NAME
FUNCTION
TDFN
1
2
—
4
H
High Terminal
2
SDA
GND
SCL
I C-Compatible Interface Data Input
3
2
Ground
2
4
3
I C-Compatible Interface Clock Input
5
1
V
Power-Supply Input. Bypass with a 0.1µF capacitor from V
2
to GND.
DD
DD
6
—
6
A0
Address Input. Sets the I C address. Connect to V
Low Terminal
or GND. Do not leave A0 floating.
DD
7
L
8
5
W
Wiper Terminal
EP
—
EP
Exposed Pad. Internally connected to GND.
power-on reset circuitry and internal oscillator control
the transfer of data from the nonvolatile register to the
volatile register.
Detailed Description
The MAX5432–MAX5435 contain a resistor array with
31 resistive elements. The MAX5432/MAX5434 provide
a total end-to-end resistance of 50kΩ, and the
MAX5433/MAX5435 provide an end-to-end resistance
of 100kΩ.
Serial Addressing
The MAX5432–MAX5435 operate as a slave that sends
and receives data through an I2C- and SMBus™-com-
patible 2-wire interface. The interface uses a serial data
access (SDA) line and a serial clock line (SCL) to
achieve bidirectional communication between
master(s) and slave(s). A master, typically a microcon-
troller, initiates all data transfers to and from the
MAX5432–MAX5435, and generates the SCL clock that
synchronizes the data transfer (Figure 1).
The MAX5432/MAX5433 allow access to the high, low,
and wiper terminals for a standard voltage-divider con-
figuration. Connect H, L, and W in any desired configu-
ration as long as their voltages fall between GND and
. The MAX5434/MAX5435 are variable resistors
with H internally connected to the wiper.
A simple 2-wire I2C-compatible serial interface moves
the wiper among the 32 tap points. Eight data bits, an
address byte, and a control byte program the wiper
position. A nonvolatile memory stores and recalls the
wiper position in the nonvolatile memory upon power-up.
The nonvolatile memory is guaranteed for 200,000 wiper
store cycles and 50 years for wiper data retention.
V
DD
SDA operates as both an input and an open-drain out-
put. SDA requires a pullup resistor, typically 4.7kΩ.
SCL only operates as an input. SCL requires a pullup
resistor (4.7kΩ typ) if there are multiple masters on the
2-wire interface, or if the master in a single-master sys-
tem has an open-drain SCL output.
Each transmission consists of a START (S) condition
(Figure 3) sent by a master, followed by the
MAX5432–MAX5435 7-bit slave address plus the 8th bit
(Figure 4), 1 command byte (Figure 7) and 1 data byte,
and finally a STOP (P) condition (Figure 3).
Digital Interface
The MAX5432–MAX5435 feature an internal, nonvolatile
EEPROM that returns the wiper to its previously stored
position at power-up. The shift register decodes the
control and address bits, routing the data to the proper
memory registers. Write data to the volatile memory
register to immediately update the wiper position, or
write data to the nonvolatile register for storage. Writing
to the nonvolatile register takes a minimum of 12ms.
Start and Stop Conditions
Both SCL and SDA remain high when the interface is
not busy. A master signals the beginning of a transmis-
sion with a START (S) condition by transitioning SDA
from high to low while SCL is high. When the master
has finished communicating with the slave, it issues a
STOP (P) condition by transitioning the SDA from low to
The volatile register retains data as long as the device
is enabled and powered. Removing power clears the
volatile register. The nonvolatile register retains data
even after power is removed. Upon power-up, the
SMBus is a trademark of Intel Corporation.
8
_______________________________________________________________________
2
32-Tap, Nonvolatile, I C, Linear, Digital
Potentiometers
t
t
F
R
SDA
SCL
t
BUF
t
t
HD-DAT
SU-DAT
t
HD-STA
t
t
SU-STA
SU-STO
t
LOW
t
HIGH
t
HD-STA
t
R
t
F
S
Sr
A
P
S
PARAMETERS ARE MEASURED FROM 30% TO 70%.
Figure 1. I2C Serial-Interface Timing Diagram
high while SCL is high. The bus is then free for another
transmission (Figure 3).
Table 1a. Address Codes
(MAX5432/MAX5433 Only)
Bit Transfer
One data bit is transferred during each clock pulse.
The data on the SDA line must remain stable while SCL
is high (Figure 5).
ADDRESS ꢁYTE
PART
SUFFIX
A6 A5 A4 A3 A2 A1 A0
NOP/W
ꢀ
ꢀ
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
0
0
0
1
0
1
NOP/W
NOP/W
NOP/W
NOP/W
Acknowledge
The acknowledge bit is a clocked 9th bit that the recip-
ient uses to handshake receipt of each byte of data
(Figure 6). Each byte transferred effectively requires 9
bits. The master generates the 9th clock pulse, and the
recipient pulls down SDA during the acknowledge
clock pulse, so the SDA line is stable low during the
high period of the clock pulse. When the master trans-
mits to the MAX5432–MAX5435, the devices generate
the acknowledge bit because the MAX5432–MAX5435
are the recipients.
M
M
Table 1b. Address Codes
(MAX5434/MAX5435 Only)
ADDRESS ꢁYTE
PART
SUFFIX
A6 A5 A4 A3 A2 A1 A0
NOP/W
Slave Address
The MAX5432–MAX5435 have a 7-bit-long slave
address (Figure 4). The 8th bit following the 7-bit slave
address is the NOP/W bit. Set the NOP/W bit low for a
write command and high for a no-operation command.
ꢀ
M
N
P
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
1
0
1
0
0
1
1
0
0
0
0
NOP/W
NOP/W
NOP/W
NOP/W
Table 1a shows four possible slave addresses for the
MAX5432/MAX5433 and Table 1b shows four possible
slave addresses for the MAX5434/MAX5435. The first 4
bits (MSBs) of the slave addresses are always 0101.
Bits A2 and A1 are factory programmed for the
MAX5432/MAX5433 (Table 1a). Connect the A0 input
Message Format for Writing
A write to the MAX5432–MAX5435 consists of the trans-
mission of the device’s slave address with the 8th bit set
to zero, followed by at least 1 byte of information. The
1st byte of information is the command byte. The bytes
received after the command byte are the data bytes.
The 1st data byte goes into the internal register of the
MAX5432–MAX5435 as selected by the command byte
(Figure 8).
(MAX5432/MAX5433 only) to either GND or V
to
DD
select one of two I2C device addresses. Each device
must have a unique address to share the bus. A maxi-
mum of four MAX5432/MAX5433 devices can share the
same bus. Bits A2, A1, and A0 are factory programmed
for the MAX5434/MAX5435 (Table 1b).
__________________________________________________________________________
2
32-Tap, Nonvolatile, I C, Linear, Digital
Potentiometers
V
DD
I
= 3mA
OL
SDA
SCL
V
SDA
OUT
400pF
S
P
START
STOP
CONDITION
CONDITION
I
= 0mA
OH
Figure 2. Load Circuit
Figure 3. Start and Stop Conditions
SDA
SCL
0
1
0
1
0*
0*
NOP/W
ACK
A0
MSB
LSB
*SEE THE Selector Guide FOR OTHER ADDRESS OPTIONS.
Figure 4. Slave Address
Command Byte
Command Descriptions
Use the command byte to select the destination of the
wiper data (nonvolatile or volatile memory registers)
and swap data between nonvolatile and volatile memo-
ry registers (see Table 2).
VREG: The data byte writes to the volatile memory reg-
ister and the wiper position updates with the data in the
volatile memory register.
NVREG: The data byte writes to the nonvolatile memory
register. The wiper position is unchanged.
Data Byte
The MAX5432–MAX5435 use the first 5 bits (MSBs,
D7–D3) of the data byte to set the position of the wiper.
The last 3 bits (D2, D1, and D0) are don’t care bits (see
Table 2).
NVREGxVREG: Data transfers from the nonvolatile
memory register to the volatile memory register (wiper
position updates).
VREGxNVREG: Data transfers from the volatile memory
register into the nonvolatile memory register.
Table 2. Command ꢁyte Summary
REGISTER
ADDRESS ꢁYTE
COMMAND ꢁTYE
DATA ꢁYTE
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
N
O
P/
W
SCL CYCLE
NUMBER
A
C
K
A
C
K
A
C
K
A6 A5 A4 A3 A2 A1 A0
C7 C6 C5 C4 C3 C2 C1 C0
D7 D6 D5 D4 D3 D2 D1 D0
VREG
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
A2 A1 A0
A2 A1 A0
A2 A1 A0
A2 A1 A0
0
0
0
0
0
0
0
0
0
0
1
1
0
1
1
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
D7 D6 D5 D4 D3
D7 D6 D5 D4 D3
D7 D6 D5 D4 D3
D7 D6 D5 D4 D3
X
X
X
X
X
X
X
X
X
X
X
X
NVREG
NVREGxVREG
VREGxNVREG
X = Don’t care.
10 ______________________________________________________________________
2
32-Tap, Nonvolatile, I C, Linear, Digital
Potentiometers
CLOCK PULSE FOR
ACKNOWLEDGMENT
START
SDA
SCL
CONDITION
SCL
1
2
8
9
NOT ACKNOWLEDGE
SDA
DATA STABLE, CHANGE OF
DATA VALID DATA ALLOWED
ACKNOWLEDGE
Figure 6. Acknowledge
Figure 5. Bit Transfer
COMMAND BYTE IS STORED ON
RECEIPT OF STOP CONDITION
D9
D14
D13
D11 D10
D8
D15
D12
ACKNOWLEDGE FROM
MAX5432–MAX5435
SLAVE
ADDRESS
A
A
S
0
P
COMMAND BYTE
ACKNOWLEDGE FROM
MAX5432–MAX5435
NOP/W
Figure 7. Command Byte Received
ACKNOWLEDGE FROM
MAX5432–MAX5435
ACKNOWLEDGE FROM
MAX5432–MAX5435
HOW COMMAND BYTE AND DATA BYTE MAP
INTO MAX5432–MAX5435's REGISTERS
ACKNOWLEDGE FROM
D11 D10
D8
D6 D5 D4 D3
X
X
X
D9
D15 D14 D13
D7
D12
MAX5432–MAX5435
A
A
SLAVE ADDRESS
S
0
DATA BYTE
P
COMMAND BYTE
A
1
NOP/W
BYTE
Figure 8. Command and Single Data Byte Received
with the data stored in the nonvolatile memory register.
This initialization period takes 20µs.
Nonvolatile Memory
The internal EEPROM consists of a 5-bit nonvolatile
register that retains the value written to it before the
device is powered down. The nonvolatile register is
programmed with the zeros at the factory. Wait a mini-
mum of 12ms after writing to NVREG before sending
another command.
Standby
The MAX5432–MAX5435 feature a low-power standby
mode. When the device is not being programmed, it
goes into standby mode and current consumption is
typically 0.5µA.
Power-Up
Upon power-up, the MAX5432–MAX5435 load the data
stored in the nonvolatile memory register into the
volatile memory register, updating the wiper position
______________________________________________________________________________________ 11
2
32-Tap, Nonvolatile, I C, Linear, Digital
Potentiometers
5V
5V
H
30V
30V
W
MAX5432
MAX5433
V
OUT
V
OUT
H
L
MAX5432–
MAX5435
W
L
Figure 10. Positive LCD Bias Control Using a Variable Resistor
Figure 9. Positive LCD Bias Control Using a Voltage-Divider
W
+5V
L
V
IN
V
IN
H
R3
C
V
OUT
V REF
0
OUT
ADJ
H
L
R
R
1
MAX6160
R1
W
MAX5432
MAX5433
2
GND
H
MAX5432–
MAX5435
R2
W
50kΩ
2
V = 1.23V
FOR THE MAX5432
FOR THE MAX5433
0
R (kΩ)
L
100kΩ
V = 1.23V
0
R (kΩ)
2
Figure 12. Adjustable Voltage Reference
Figure 11. Programmable Filter
R2, and the cutoff frequency is adjusted by R3. Use the
following equations to calculate the gain (G) and the
Applications Information
Use the MAX5432–MAX5435 in applications requiring
digitally controlled adjustable resistance, such as LCD
contrast control (where voltage biasing adjusts the dis-
play contrast), or for programmable filters with
adjustable gain and/or cutoff frequency.
3dB cutoff frequency (f ).
C
R1
R2
G = 1 +
1
f
=
C
2π × R3 × C
Positive LCD Bias Control
Figures 9 and 10 show an application where the volt-
age-divider or variable resistor is used to make an
adjustable, positive LCD bias voltage. The op-amp pro-
vides buffering and gain to the resistor-divider network
made by the potentiometer (Figure 9) or to a fixed
resistor and a variable resistor (Figure 10).
Adjustable Voltage Reference
Figure 12 shows the MAX5432/MAX5433 used as the
feedback resistors in an adjustable voltage reference
application. Independently adjust the output voltages of
the MAX6160 from 1.23V to (V - 0.2V) by changing
IN
the wiper position of the MAX5432/MAX5433.
Programmable Filter
Figure 11 shows the configuration for a 1st-order pro-
grammable filter. The gain of the filter is adjusted by
12 ______________________________________________________________________________________
2
32-Tap, Nonvolatile, I C, Linear, Digital
Potentiometers
MAX5432/MAX5433 Functional Diagram
H
V
32-
POSITION
DECODER
DD
5-BIT
SHIFT
REGISTER
5-BIT
LATCH
5
32
5
W
L
GND
POR
SDA
2
I C
INTERFACE
5-BIT
NV
MEMORY
SCL
A0
MAX5432
MAX5433
MAX5434/MAX5435 Functional Diagram
V
32-
POSITION
DECODER
DD
5-BIT
SHIFT
REGISTER
5-BIT
LATCH
5
32
5
W
L
GND
POR
SDA
SCL
2
I C
INTERFACE
5-BIT
NV
MEMORY
MAX5434
MAX5435
______________________________________________________________________________________ 13
2
32-Tap, Nonvolatile, I C, Linear, Digital
Potentiometers
Selector Guide
Chip Information
TRANSISTOR COUNT: 7817
PART
TOP MARK
ANG
I2C ADDRESS
R (kΩ)
50
PROCESS: BiCMOS
MAX5432LETA
MAX5432META
MAX5433LETA
MAX5433META
MAX5434LEZT
MAX5434MEZT
MAX5434NEZT
MAX5434PEZT
MAX5435LEZT
MAX5435MEZT
MAX5435NEZT
MAX5435PEZT
010100A
010110A
010100A
010110A
0
0
0
0
ANI
50
ANF
100
100
ANH
AABX
AABY
AABS
AABU
AABW
AABV
AABZ
AABT
0101000
0101100
0101010
0101110
0101000
0101100
0101010
0101110
50
50
50
50
100
100
100
100
14 ______________________________________________________________________________________
2
32-Tap, Nonvolatile, I C, Linear, Digital
Potentiometers
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
D
N
PIN 1
INDEX
AREA
E
E2
DETAIL A
C
L
C
L
A
L
L
e
e
PACKAGE OUTLINE, 6,8,10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
1
-DRAWING NOT TO SCALE-
21-0137
G
2
COMMON DIMENSIONS
SYMBOL
MIN.
0.70
2.90
2.90
0.00
0.20
MAX.
0.80
3.10
3.10
0.05
0.40
A
D
E
A1
L
k
0.25 MIN.
0.20 REF.
A2
PACKAGE VARIATIONS
DOWNBONDS
ALLOWED
N
6
D2
E2
e
JEDEC SPEC
b
PKG. CODE
T633-1
[(N/2)-1] x e
1.90 REF
1.90 REF
1.95 REF
1.50±0.10
1.50±0.10
1.50±0.10
1.50±0.10
1.50±0.10
1.50±0.10
1.70±0.10
1.70±0.10
2.30±0.10
2.30±0.10
2.30±0.10
2.30±0.10
2.30±0.10
2.30±0.10
2.30±0.10
2.30±0.10
0.95 BSC
0.95 BSC
0.65 BSC
0.65 BSC
0.65 BSC
0.50 BSC
0.40 BSC
0.40 BSC
MO229 / WEEA
MO229 / WEEA
MO229 / WEEC
MO229 / WEEC
MO229 / WEEC
MO229 / WEED-3
- - - -
0.40±0.05
0.40±0.05
0.30±0.05
0.30±0.05
0.30±0.05
0.25±0.05
0.20±0.05
0.20±0.05
NO
NO
T633-2
6
T833-1
8
NO
T833-2
8
1.95 REF
1.95 REF
2.00 REF
2.40 REF
2.40 REF
NO
T833-3
8
YES
NO
T1033-1
T1433-1
T1433-2
10
14
14
YES
NO
- - - -
PACKAGE OUTLINE, 6,8,10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
2
-DRAWING NOT TO SCALE-
21-0137
G
2
______________________________________________________________________________________ 15
2
32-Tap, Nonvolatile, I C, Linear, Digital
Potentiometers
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
16 ______________________________________________________________________________________
2
32-Tap, Nonvolatile, I C, Linear, Digital
Potentiometers
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17
© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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