Rev 1; 3/09
High-Voltage, NV, I
2
C POT
General Description
The DS3502 is a 7-bit, nonvolatile (NV) digital poten-
tiometer (POT) featuring an output voltage range of up to
15.5V. Programming is accomplished by an I
2
C-compat-
ible interface, which can operate at speeds of up to
400kHz. External voltages are applied at the RL and RH
inputs to define the lowest and highest potentiometer
outputs.
♦
♦
♦
128 Wiper Tap Points
Full-Scale Resistance: 10kΩ
I
2
C-Compatible Serial Interface
Features
DS3502
♦
Address Pins Allow Up to Four DS3502s to Share
the Same I
2
C Bus
♦
Digital Operating Voltage: 2.5V to 5.5V
♦
Analog Operating Voltage: 4.5V to 15.5V
♦
Operating Temperature: -40°C to +100°C
♦
10-Pin µSOP Package
Applications
TFT-LCD V
COM
Calibration
Instrumentation and Industrial Controls
Mechanical POT Replacement
Ordering Information
PART
DS3502U+
TEMP RANGE
-40°C to +100°C
-40°C to +100°C
PIN-PACKAGE
10 μSOP
10 μSOP
Pin Configuration and Typical Operating Circuit appear at
end of data sheet.
DS3502U+T&R
+Denotes
a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
Functional Diagram
RH
127
SDA
SCL
7-BIT
WIPER REGISTER
126
DS3502
125
DECODER
LEVEL SHIFTER
7-BIT
NONVOLATILE MEMORY
2
1
0
CONTROL CIRCUITRY
AND
ADDRESS DECODE
A1
A0
RL
RW
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
High-Voltage, NV, I
2
C POT
DS3502
ABSOLUTE MAXIMUM RATINGS
Voltage Range on V
CC
Relative to GND ...............-0.5V to +6.0V
Voltage Range on V+ Relative to GND ..................-0.5V to +17V
Voltage Range on SDA, SCL, A0, A1
Relative to GND.......-0.5V to (V
CC
+ 0.5V), not to exceed 6.0V
Voltage Range on RH, RL, RW...................................-0.5V to V+
Voltage Range Across RH and RL Pins .....................-0.5V to V+
Operating Temperature Range .........................-40°C to +100°C
Programming Temperature Range .........................0°C to +70°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature...........................Refer to the IPC/JEDEC
J-STD-020 Specification.
Maximum RW Current ...........................................................1mA
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.
RECOMMENDED OPERATING CONDITIONS
(T
A
= -40°C to +100°C)
PARAMETER
Supply Voltage
V+ Voltage
Input Logic 1
(SCL, SDA, A0, A1)
Input Logic 0
(SCL, SDA, A0, A1)
Resistor Inputs (RL, RW, RH)
Wiper Current
SYMBOL
V
CC
V+
V
IH
V
IL
V
RES
I
WIPER
(Note 1)
V+ > V
CC
CONDITIONS
MIN
+2.5
+4.5
0.7 x
V
CC
-0.3
-0.3
TYP
MAX
+5.5
+15.5
V
CC
+ 0.3
0.3 x
V
CC
+15.5
1
UNITS
V
V
V
V
V
mA
ELECTRICAL CHARACTERISTICS
(V
CC
= +2.5V to +5.5V, T
A
= -40°C to +100°C, unless otherwise noted.)
PARAMETER
V
CC
Supply Current
Standby Supply Current
V+ Bias Current
Input Leakage (SDA, SCL, A0, A1)
Wiper Response Time
Low-Level Output Voltage (SDA)
I/O Capacitance
Power-Up Recall Voltage
Power-Up Memory Recall Delay
Wiper Resistance
End-to-End Resistance (RH to RL)
R
TOTAL
Tolerance
CH, CL, CW Capacitance
C
POT
SYMBOL
I
CC
I
STBY
I
V+
I
L
t
WRS
V
OL
C
I/O
V
POR
t
D
R
W
R
TOTAL
T
A
= +25°C
-20
10
(Note 4)
(Note 5)
V+ = 15.0V
10
+20
1.2
3mA sink current
0.0
5
-1
(Note 2)
(Note 3)
CONDITIONS
MIN
TYP
0.2
MAX
3
10
+1
+1
1
0.4
10
2.4
3
5000
k
%
pF
UNITS
mA
μA
μA
μA
μs
V
pF
V
ms
2
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High-Voltage, NV, I
2
C POT
VOLTAGE-DIVIDER CHARACTERISTICS
(V
CC
= +2.5V to +5.5V, T
A
= -40°C to +100°C, unless otherwise noted.)
PARAMETER
Integral Nonlinearity
Differential Nonlinearity
Zero-Scale Error
Full-Scale Error
Ratiometric Temp Coefficient
SYMBOL
INL
DNL
ZS
ERROR
FS
ERROR
TCV
(Note 6)
(Note 7)
V+ = 4.5V (Note 8)
V+ = 4.5V (Note 9)
WR/IVR register set to 40h
CONDITIONS
MIN
-1
-0.5
0
-2
0.5
-1
±4
TYP
MAX
+1
+0.5
2
0
UNITS
LSB
LSB
LSB
LSB
ppm/°C
DS3502
I
2
C AC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.5V to +5.5V, T
A
= -40°C to +100°C, timing referenced to V
IL(MAX)
and V
IH(MIN)
. See Figure 2.)
PARAMETER
SCL Clock Frequency
Bus Free Time Between STOP
and START Conditions
Hold Time (Repeated) START
Condition
Low Period of SCL
High Period of SCL
Data Hold Time
Data Setup Time
START Setup Time
SDA and SCL Rise Time
SDA and SCL Fall Time
STOP Setup Time
SDA and SCL Capacitive
Loading
EEPROM Write Time
Pulse-Width Suppression Time at
SDA and SCL Inputs
A0, A1 Setup Time
A0, A1 Hold Time
SDA and SCL Input Buffer
Hysteresis
SYMBOL
f
SCL
t
BUF
t
HD:STA
t
LOW
t
HIGH
t
HD:DAT
t
SU:DAT
t
SU:STA
t
R
t
F
t
SU:STO
C
B
t
W
t
IN
t
SU:A
t
HD:A
(Note 11)
(Note 12)
(Note 13)
Before START
After STOP
0.6
0.6
0.05 x
V
CC
10
50
(Note 11)
(Note 11)
(Note 10)
CONDITIONS
MIN
0
1.3
0.6
1.3
0.6
0
100
0.6
20 +
0.1C
B
20 +
0.1C
B
0.6
400
20
300
300
0.9
TYP
MAX
400
UNITS
kHz
μs
μs
μs
μs
μs
ns
μs
ns
ns
μs
pF
ms
ns
μs
μs
V
_______________________________________________________________________________________
3
High-Voltage, NV, I
2
C POT
DS3502
NONVOLATILE MEMORY CHARACTERISTICS
(V
CC
= +2.5V to +5.5V)
PARAMETER
EEPROM Write Cycles
SYMBOL
T
A
= +70°C
T
A
= +25°C
CONDITIONS
MIN
50,000
200,000
TYP
MAX
UNITS
Writes
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
Note 12:
Note 13:
All voltages are referenced to ground. Currents entering the IC are specified positive and currents exiting the IC are negative.
I
CC
is specified with the following conditions: SCL = 400kHz, SDA pulled up, and RL, RW, RH floating.
I
STBY
is specified with SDA = SCL = V
CC
= 5.5V and resistor pins floating.
This is the minimum V
CC
voltage that causes NV memory to be recalled.
This is the time from V
CC
> V
POR
until initial memory recall is complete.
Integral nonlinearity is the deviation of a measured resistor setting value from the expected values at each particular resis-
tor setting. Expected value is calculated by connecting a straight line from the measured minimum setting to the mea-
sured maximum setting. INL = [V(RW)
i
- (V(RW)
0
]/LSB(ideal) - i, for i = 0...127.
Differential nonlinearity is the deviation of the step-size change between two LSB settings from the expected step size.
The expected LSB step size is the slope of the straight line from measured minimum position to measured maximum posi-
tion. DNL = [V(RW)
i+1
- (V(RW)
i
]/LSB(ideal) - 1, for i = 0...126.
ZS error = code 0 wiper voltage divided by one LSB (ideal).
FS error = (code 127 wiper voltage - V+) divided by one LSB (ideal).
I
2
C interface timing shown is for fast-mode (400kHz) operation. This device is also backward-compatible with I
2
C standard
mode timing.
CB—total capacitance of one bus line in picofarads.
EEPROM write time begins after a STOP condition occurs.
Pulses narrower than max are suppressed.
4
_______________________________________________________________________________________
High-Voltage, NV, I
2
C POT
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
1.6
SUPPLY CURRENT (μA)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
1.0
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
SDA = SCL = V
CC
, V+ = 15.5V
RW, RH, AND RL ARE FLOATING
DS3502 toc01
DS3502
SUPPLY CURRENT
vs. TEMPERATURE
DS3502 toc02
1.8
1.5
1.4
SUPPLY CURRENT (μA)
1.3
1.2
1.1
SDA = SCL = V
CC
= 5V, V+ = 15.5V
RW, RH, AND RL ARE FLOATING
INTEGRAL NONLINEARITY
vs. POTENTIOMETER SETTING
DS3502 toc03
DIFFERENTIAL NONLINEARITY
vs. POTENTIOMETER SETTING
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
DS3502 toc04
1.0
0.8
INTEGRAL NONLINEARITY (LSB)
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
20
40
60
80
100
120
POTENTIOMETER SETTING (DEC)
0.5
DIFFERENTIAL NONLINEARITY (LSB)
0
20
40
60
80
100
120
POTENTIOMETER SETTING (DEC)
Pin Description
NAME
SDA
GND
V
CC
A1, A0
RH
RW
RL
V+
SCL
PIN
1
2
3
4, 5
6
7
8
9
10
I
2
C Serial Data. Input/output for I
2
C data.
Ground Terminal
Supply Voltage Terminal
Address Select Inputs. Determines I
2
C slave address. Slave address is 01010A
1
A
0
X. (See the
Slave Address Byte and Address Pins
section for details).
High Terminal of Potentiometer
Wiper Terminal of Potentiometer
Low Terminal of Potentiometer
Wiper Bias Voltage
I
2
C Serial Clock. Input for I
2
C clock.
FUNCTION
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5
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