Rainbow Electronics DS3501 User Manual

General Description

The DS3501 is a 7-bit, nonvolatile (NV) digital poten­tiometer featuring an output voltage range of up to 15.5V.
Programming is accomplished by an I

2

C-compatible
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.

The DS3501 contains an on-chip temperature sensor
and associated analog-to-digital converter (ADC). The
ADC output addresses a 36-word NV lookup table
(LUT). The LUT output can drive the pot directly or be
added to an NV initial-value register (IVR) to drive the
pot. This flexible LUT-based architecture allows the
DS3501 to provide a temperature-compensated poten­tiometer output with arbitrary slope.

Applications

TFT-LCD V

COM

Calibration

Linear and Nonlinear Compensation

Instrumentation and Industrial Controls

Mechanical POT Replacement

Optical Transceivers

Features

♦ 128 Wiper Tap Points

♦ Full-Scale Resistance: 10kΩ

♦ On-Chip Temperature Sensor and ADC

♦ 36-Byte Lookup Table (LUT)

♦ I

2

C-Compatible Serial Interface

♦ Address Pins Allow Up to Four DS3501s to Share

the Same I

2

C Bus

♦ Digital Operating Voltage: 2.7V to 5.5V

♦ Analog Operating Voltage: 4.5V to 15.5V

♦ Operating Temperature: -40°C to +100°C

♦ Pin and Software Compatible with ISL95311

(Default Mode)

♦ 10-Pin μSOP Package

DS3501

High-Voltage, NV, I2C POT with Temp Sensor

and Lookup Table

______________________________________________

Maxim Integrated Products

1

Rev 0; 1/07

+

Denotes a lead-free package.

T&R denotes tape-and-reel.

Ordering Information

VOLATILE

WIPER REGISTER

NV IVR

36-BYTE

LUT

NV

MEMORY

CONTROL

CIRCUITRY

AND ADDRESS

DECODE

TEMP

SENSOR

AND ADC

A1

A0

SDA

SCL

∑

DECODER

LEVEL

SHIFTER

127

126

125

2

1

0

RH

RL

RW

DS3501

Functional Diagram

Pin Configuration and Typical Operating Circuit appear at
end of data sheet.

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.

PART TEMP RANGE PIN-PACKAGE

DS3501U+ -40°C to +100°C 10 µSOP

DS3501U+T&R -40°C to +100°C 10 µSOP

DS3501

High-Voltage, NV, I2C POT with Temp Sensor
and Lookup Table

2 _____________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

RECOMMENDED OPERATING CONDITIONS

(TA= -40°C to +100°C)

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.

Voltage Range on VCCRelative 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 .......................................See IPC/JEDEC

J-STD-020 Specification

Maximum RW Current ...........................................................1mA

DC ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +5.5V, TA= -40°C to +100°C, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage V

V+ Voltage V+ V+ > V

Input Logic 1
(SCL, SDA, A0, A1)

Input Logic 0
(SCL, SDA, A0, A1)

Resistor Inputs (RL, RW, RH) V

Wiper Current I

V

V

RES

WIPER

(Note 1) +2.7 +5.5 V

CC

CC

IH

IL

+4.5 +15.5 V

0.7 x
V

CC

-0.3

-0.3

V

CC

+ 0.3

0.3 x
V

CC

V+

+ 0.3

1mA

V

V

V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

I

VCC Supply Current

Standby Supply Current I

V+ Bias Current I

Inp ut Leakag e ( S D A, S C L, A0, A1) I

Low-Level Output Voltage (SDA) V

I/O Capacitance C

Power-Up Recall Voltage V

Power-Up Memory Recall Delay t

Wiper Resistance R

E nd - to- E nd Resi stance ( RH to RL) R

R

Tolerance TA = +25°C -20 +20 %

TOTAL

R

Temp Co. (Note 7) ±200 ppm

TOTAL

CH, CL, CW Capacitance C

CC

I

CC2

STBY

V+

POR

TOTAL

POT

(Note 2) 2 mA

(Note 3) 250 350 µA

(Note 4) 40 60 µA

L

3mA sink current 0.0 0.4 V

OL

I/O

(Note 5) 1.6 2.6 V

(Note 6) 5 ms

D

V+ = 15.0V 5000 Ω

W

+1 µA

-1 +1 µA

510pF

10 kΩ

10 pF

DS3501

High-Voltage, NV, I2C POT with Temp Sensor

and Lookup Table

_____________________________________________________________________ 3

ANALOG VOLTAGE MONITORING CHARACTERISTICS

(VCC= +2.7V to +5.5V, TA= -40°C to +100°C, unless otherwise noted.)

TEMPERATURE SENSOR CHARACTERISTICS

(VCC= +2.7V to +5.5V, TA= -40°C to +100°C, unless otherwise noted.)

VOLTAGE-DIVIDER CHARACTERISTICS

(VCC= +2.7V to +5.5V, TA= -40°C to +100°C, unless otherwise noted.)

I2C AC ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +5.5V, TA= -40°C to +100°C, timing referenced to V

IL(MAX)

and V

IH(MIN)

. See Figure 3.)

Temperature Error ±5 °C

Update Rate (Temperature and
Supply Conversion Time)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

t

FRAME

16 ms

Supply Resolution LSB Full-scale voltage of 6.5536V 25.6 mV

Input/Supply Accuracy A

Input Supply Offset V

Update Rate (Temperature and
Supply Conversion Time)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

% FS

CC

OS

t

FRAME

At factory setting 0.25 1

(Note 7) 0 5 LSB

16 ms

(Full

Scale)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Integral Nonlinearity INL (Note 8) -1 +1 LSB

Differential Nonlinearity DNL (Note 9) -0.5 +0.5 LSB

Zero-Scale Error ZS

Full-Scale Error FS

Ratiometric Temp Coefficient TCV WR set to 40h ±4 ppm/°C

ERROR

ERROR

V+ = 4.5V
(Note 10)

V+ = 4.5V
(Note 11)

0 0.5 2 LSB

-2 -0.003 0 LSB

SCL Clock Frequency f

Bus Free Time Between STOP
and START Conditions

Hold Time (Repeated) START
Condition

Low Period of SCL t

High Period of SCL t

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SCL

t

BUF

t

HD:STA

LOW

HIGH

(Note 12) 0 400 kHz

1.3 µs

0.6 µs

1.3 µs

0.6 µs

DS3501

High-Voltage, NV, I2C POT with Temp Sensor
and Lookup Table

4 _____________________________________________________________________

NONVOLATILE MEMORY CHARACTERISTICS

(VCC= +2.7V to +5.5V)

Note 1: All voltages are referenced to ground. Currents entering the IC are specified positive and currents exiting the IC are nega-

tive.

Note 2: I

CC

is specified with the following conditions: SCL = 400kHz; SDA pulled up; and RL, RW, RH floating.

Note 3: I

CC

is specified with the following conditions: SCL, SDA pulled up; RL, RW, RH floating; and temperature sensor on.

Note 4: I

STBY

is specified with SDA = SCL = VCC= 5.5V, resistor pins floating, and CR2 bit 0 = logic-high.

Note 5: This is the minimum V

CC

voltage that causes NV memory to be recalled.

Note 6: This is the time from V

CC

> V

POR

until initial memory recall is complete.

Note 7: Guaranteed by design.
Note 8: 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 measured
maximum setting. INL = [V(RW)

i

- (V(RW)0] / LSB(ideal) - i, for i = 0...127.

Note 9: 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 position.
DNL = [V(RW)

i+1

- (V(RW)i] / LSB(ideal) - 1, for i = 0...126.

Note 10: ZS error = code 0 wiper voltage divided by one LSB(ideal).
Note 11: FS error = (code 127 wiper voltage - V+) divided by one LSB (ideal).
Note 12: I

2

C interface timing shown is for fast-mode (400kHz) operation. This device is also backward-compatible with I2C standard

mode timing.

Note 13: CB—total capacitance of one bus line in picofarads.
Note 14: EEPROM write time begins after a STOP condition occurs.
Note 15: Pulses narrower than max are suppressed.

I2C AC ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2.7V to +5.5V, TA= -40°C to +100°C, timing referenced to V

IL(MAX)

and V

IH(MIN)

. See Figure 3.)

Data Hold Time t

Data Setup Time t

START Setup Time t

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

HD:DAT

SU:DAT

SU:STA

SDA and SCL Rise Time t

SDA and SCL Fall Time t

STOP Setup Time t

SDA and SCL Capacitive
Loading

EEPROM Write Time t

Pulse-Width Suppression Time at
SDA and SCL Inputs

A0, A1 Setup Time t

A0, A1 Hold Time t

SDA and SCL Input Buffer
Hysteresis

SU:STO

C

t

SU:A

HD:A

(Note 13)

R

(Note 13)

F

(Note 13) 400 pF

B

(Note 14) 10 20 ms

W

(Note 15) 50 ns

IN

Before START 0.6 µs

After STOP 0.6 µs

0 0.9 µs

100 ns

0.6 µs

20 +

0.1C

B

20 +

0.1C

B

0.6 µs

0.05 x
V

CC

300 ns

300 ns

V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

EEPROM Write Cycles

TA = +70°C 50,000

= +25°C 200,000

T

A

Writes

DS3501

High-Voltage, NV, I2C POT with Temp Sensor

and Lookup Table

_____________________________________________________________________

5

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

20

70

120

170

220

-40 0-20 20 40 60 80 100

SUPPLY CURRENT vs. TEMPERATURE

DS3501 toc01

TEMPERATURE (°C)

SUPPLY CURRENT (μA)

LUT MODE

DEFAULT MODE

V+ = 15.5V, VCC = 5V
SDA = SCL = V

CC

; RH, RL, RW ARE FLOATING

20

70

170

120

220

SUPPLY CURRENT vs. SUPPLY VOLTAGE

DS3501 toc02

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (μA)

2.7 4.1 5.5

LUT MODE

DEFAULT MODE

V+ = 15.5V
SDA = SCL = V

CC

; RL, RH, RW ARE FLOATING

30

32

31

34

33

35

36

-40 20 40-20 0 60 80 100

STANDBY SUPPLY CURRENT

vs. TEMPERATURE

DS3501 toc03

TEMPERATURE (°C)

STANDBY SUPPLY CURRENT (μA)

LUT MODE

DEFAULT MODE

V+ = 15.5V, VCC = 5V
SDA = SCL = V

CC

; RH, RL, RW ARE FLOATING

-0.75

-0.50

-0.25

0

0.25

0.50

0.75

03216 48 64 80 96 112

INTEGRAL NONLINEARITY

vs. POTENTIOMETER SETTING

DS3501 toc04

POTENTIOMETER SETTING (DEC)

INTEGRAL NONLINEARITY (LSB)

-0.75

-0.50

-0.25

0

0.25

0.50

0.75

03216 48 64 80 96 112

DIFFERENTIAL NONLINEARITY
vs. POTENTIOMETER SETTING

DS3501 toc05

POTENTIOMETER SETTING (DEC)

DIFFERENTIAL NONLINEARITY (LSB)

Pin Description

NAME PIN DESCRIPTION

SDA 1 I2C Serial Data. Input/output for I2C data.

GND 2 Ground Terminal

V

CC

3 Supply Voltage Terminal

A1, A0 4, 5

Address Select Inputs. Determines I

2

C slave address. Slave address is 01010A1A0X. (See the Slave

Address Byte and Address Pins section for details).

RH 6 High Terminal of Potentiometer

RW 7 Wiper Terminal of Potentiometer

RL 8 Low Terminal of Potentiometer

V+ 9 Wiper Bias Voltage

SCL 10 I2C Serial Clock. Input for I2C clock.