Datasheet

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General Description

The DS3503 features two synchronized stepping digital

potentiometers: one 7-bit potentiometer with RW as its

output, and another potentiometer with Y as its output.

Both potentiometers reference the RH and RL terminals

and feature an output voltage range of up to 15.5V. In

addition, both potentiometer outputs can be stepped

up and down by configuring the control registers.

Programming is accomplished by an I

C-compatible

interface that can operate at speeds of up to 400kHz.

Applications

TFT-LCD V

COM

Calibration

Instrumentation and Industrial Controls

Mechanical Potentiometer Replacement

Features

♦ 128 Wiper Tap Points

♦ Full-Scale Resistance: 5kΩ

♦ Programmable Logic Lets WR Step Up and Down

with Timing Controlled by SYNC Input

♦ Second Potentiometer Output Pin (Y) Centered at

Position 40h

♦ I

C-Compatible Serial Interface

♦ Digital Operating Voltage: 2.7V to 3.6V

♦ Analog Operating Voltage: 4.5V to 15.5V

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

♦ 10-Pin µSOP Package

DS3503

NV, I

C, Stepper Potentiometer

________________________________________________________________

Maxim Integrated Products

Ordering Information

Rev 1; 3/09

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.

PART TEMP RANGE PIN-PACKAGE

DS3503U+ -40°C to +100°C 10 μSOP

DS3503U+T&R -40°C to +100°C 10 μSOP

Denotes a lead(Pb)-free/RoHS-compliant package.

T&R = Tape and reel.

Typical Operating Circuit appears at end of data sheet.

PERIOD

1 LSB

CODE 64

(40h)

WR+STEPCOUNT

CODE 64 (40h) + STEPCOUNT

CODE 64 (40h) - STEPCOUNT

CODE 64

(40h)

WR-STEPCOUNT

DS3503

OUT

LOGIC

IVR

EEPROM

ADDRESS

C RD BUS

SCL

SDA

SCL

SDA

V+

GND

SYNC

STEP CONTROL

MUX

ADDRESS

7-BIT

POT

STEP

COUNTER

AND

CONTROL

LOGIC

C WR BUS

COUNT

PERIOD (2 BITS)

STEP COUNT (2 BITS)

7-BIT

POT

Functional Diagram

μSOP

29V+GND

1 10 SCLSDA

RLV

47RWSYNC

RHY5 6

TOP VIEW

DS3503

Pin Configuration

Summary of content (13 pages)

PAGE 1
Rev 1; 3/09 NV, I2C, Stepper Potentiometer The DS3503 features two synchronized stepping digital potentiometers: one 7-bit potentiometer with RW as its output, and another potentiometer with Y as its output. Both potentiometers reference the RH and RL terminals and feature an output voltage range of up to 15.5V. In addition, both potentiometer outputs can be stepped up and down by configuring the control registers.
PAGE 2
DS3503 NV, I2C, Stepper Potentiometer ABSOLUTE MAXIMUM RATINGS Voltage Range on VCC Relative to GND ...............-0.5V to +6.0V Voltage Range on V+ Relative to GND ..................-0.5V to +17V Voltage Range on SDA, SCL, and SYNC Relative to VCC ........-0.5V to (VCC + 0.5V), not to exceed 6.0V Voltage Range on RH, RL, RW, and Y .......................-0.5V to V+ Voltage Range Across RH and RL .............................-0.5V to V+ Operating Temperature Range .........................
PAGE 3
NV, I2C, Stepper Potentiometer (VCC = +2.7V to +3.6V, TA = -40°C to +100°C, with RL = 0V, RH = V+, Y, and RW unloaded, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Integral Nonlinearity INL (Note 6) -1 +1 LSB Differential Nonlinearity DNL (Note 7) -0.5 +0.5 LSB -1 +1 LSB Output Matching Zero-Scale Error ZSERROR (Note 8) 0 0.
PAGE 4
NONVOLATILE MEMORY CHARACTERISTICS (VCC = +2.7V to +3.6V, unless otherwise noted.) PARAMETER SYMBOL EEPROM Write Cycles 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: CONDITIONS MIN TA = +70°C TYP MAX 30,000 UNITS Writes All voltages are referenced to ground. Currents entering the IC are specified positive and currents exiting the IC are negative. ISTBY is specified with SDA = SCL = VCC and resistor pins floating.
PAGE 5
NV, I2C, Stepper Potentiometer 3 2 1 1.0 SDA = SCL = VCC = 3.3V, V+ = 15V 0.8 INTEGRAL NONLINEARITY (LSB) SDA = SCL = VCC = 3.3V V+ = 15V, SYNC = 3.3VP-P RW, RH, RL, AND Y ARE FLOATING 4 SUPPLY CURRENT (μA) DS3503 toc04 5 DS3503 toc05 INTEGRAL NONLINEARITY vs. POTENTIOMETER SETTING SUPPLY CURRENT vs. SYNC FREQUENCY 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 0 400 600 800 60 80 100 DELTA BETWEEN RW AND Y vs. POTENTIOMETER SETTING 0.2 0.1 0 -0.1 -0.2 -0.3 1.0 0.6 0.4 0.2 0 -0.2 -0.4 -0.
PAGE 6
DS3503 NV, I2C, Stepper Potentiometer Detailed Description The DS3503 contains two potentiometers whose outputs can be stepped up and down by configuring the control registers. One potentiometer, with output RW, is controlled by the Initial Value Register/Wiper Register (IVR/WR). The other potentiometer is fixed at setting 40h, and its output is on the Y pin. By using the configuration registers and the SYNC pin, the outputs from these two potentiometers can be stepped up and down.
PAGE 7
NV, I2C, Stepper Potentiometer Stepping The DS3503 can step the RW output up to WR+STEPCOUNT and down to WR-STEPCOUNT when stepping is enabled. Stepping is enabled when a nonzero STEPCOUNT value is programmed into SCR and pulses are applied to the SYNC input pin. Stepping is disabled when STEPCOUNT = 0 or no pulses are applied on the SYNC input pin. STEPCOUNT = 1 is an invalid setting. The falling edge of the SYNC pulse updates the outputs.
PAGE 8
DS3503 NV, I2C, Stepper Potentiometer PERIOD/2 pulses have been applied to the SYNC input. During this disable time, the power-up or new WR value is applied to the RW potentiometer and position 40h (code 64 decimal) is applied to the Y potentiometer. Additionally, the step counter is cleared during this disable time. After the initialization pulses, stepping is enabled again. The RW potentiometer starts from the power-up or new WR value and the Y potentiometer starts from position 40h (code 64 decimal).
PAGE 9
NV, I2C, Stepper Potentiometer BIT NAME 6:0 — 7 SOFT POR DS3503 Table 5. Soft Power-On Reset Register Description (AAh) FUNCTION Reserved 0: Default value. 1: Recalls values of IVR, CR, and SCR from EEPROM. Soft Power-On Reset Register (Soft-POR) By writing register AAh's MSB to 1, a soft power-on reset (soft-POR) can be generated. When the MSB is set to 1, the power-up default values of registers 00h, 01h, and 02h are recalled, and the MSB of AAh selfclears.
PAGE 10
NV, I2C, Stepper Potentiometer DS3503 Bit read: At the end of a write operation, the master must release the SDA bus line for the proper amount of setup time before the next rising edge of SCL during a bit read. The device shifts out each bit of data on SDA at the falling edge of the previous SCL pulse and the data bit is valid at the rising edge of the current SCL pulse. Remember that the master generates all SCL clock pulses, including when it is reading bits from the slave.
PAGE 11
NV, I2C, Stepper Potentiometer DS3503 TYPICAL I2C WRITE TRANSACTION MSB START 0 LSB 1 0 1 0 0 0 R/W MSB SLAVE ACK READ/ WRITE SLAVE ADDRESS b7 LSB b6 b5 b4 b3 b2 b1 b0 MSB SLAVE ACK b7 LSB b6 b5 b4 REGISTER ADDRESS b3 b2 b1 b0 SLAVE ACK STOP DATA EXAMPLE I2C TRANSACTIONS 50h A) SINGLE-BYTE WRITE -WRITE STEP CONTROL REGISTER (SCR) TO 1Fh START 01010000 START 01010000 50h B) SINGLE-BYTE READ -READ CONTROL REGISTER (CR) 01h SLAVE 00000 001 ACK 1Fh SLAVE SLAVE 00011111 A
PAGE 12
NV, I2C, Stepper Potentiometer DS3503 Typical Operating Circuit R1 B1 G1 GATE 1 TFT CLCD CSTOR GATE 2 GATE 3 VCOM I2C SDA 3.0V 15.0V VCC V+ SCL SYNC RH RW DS3503 GND RL Y Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. 12 PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
PAGE 13
NV, I2C, Stepper Potentiometer REVISION NUMBER REVISION DATE 0 11/08 1 3/09 DESCRIPTION Initial release. PAGES CHANGED — • Added the following sentence to the end of the Step Control Register (SCR) section: “A STEPCOUNT of 1 is an invalid setting. The DS3503 should not be programmed with a STEPCOUNT value of 00001.” • Added the following sentence to the Stepping section: “STEPCOUNT = 1 is an invalid setting.