Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - Digital potentiometer linear Permanent TSSOP 20

General Description

The DS3930 contains six 256-position nonvolatile (NV)

potentiometers, 64 bytes of NV user EEPROM memory,

and four programmable NV I/O pins. The six poten-

tiometers all share a common low side. The potentiome-

ters are separated into two groups of three 50kΩ

potentiometers in parallel. Each group of three poten-

tiometers shares a common high side and forms an

equivalent resistance of 16.6kΩ (three 50kΩ poten-

tiometers in parallel).

Applications

RF Transceivers

Voltage References

Power Supply Calibration

Mobile Phones and PDAs

Fiber Optic Transceiver Modules

Portable Electronics

Radio Tuners

Small, Low-Cost Replacement for Mechanical

Potentiometers

Features

♦ Six 256-Position NV Potentiometers

♦ Four General-Purpose NV I/O Pins

♦ 64 Bytes of User EEPROM Memory

♦ 0 to 5.5V on Any Potentiometer Terminal,

Independent of V

♦ All Six Potentiometers Share a Common Low Side

♦ Potentiometers Separated into Two Groups of

Three Potentiometers, Each Sharing a Common

High Side

♦ 2-Wire Serial Interface

♦ Wide Supply Range (2.7V to 5.5V)

♦ Up to Eight DS3930s Can Share the Same

2-Wire Bus

DS3930

Hex Nonvolatile Potentiometer with

I/O and Memory

_____________________________________________ Maxim Integrated Products 1

0-2

SDA

TOP VIEW

0-5

3-5

I/O

SCL

I/O

GND

TSSOP

DS3930

Pin Configuration

SDA

GND

SCL

I/O

0-5

0-2

3-5

DECOUPLING CAP

0.1µF

2-WIRE

INTERFACE

4.7kΩ 4.7kΩ

DIGITAL

NONVOLATILE I/O

DIGITAL

NONVOLATILE I/O

WIPER

TERMINALS

WIPER

TERMINALS

DS3930

Typical Operating Circuit

Ordering Information

Rev 0; 4/03

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 PIN-PACKAGE

DS3930E 20 TSSOP

Summary of content (12 pages)

PAGE 1
Rev 0; 4/03 Hex Nonvolatile Potentiometer with I/O and Memory The DS3930 contains six 256-position nonvolatile (NV) potentiometers, 64 bytes of NV user EEPROM memory, and four programmable NV I/O pins. The six potentiometers all share a common low side. The potentiometers are separated into two groups of three 50kΩ potentiometers in parallel. Each group of three potentiometers shares a common high side and forms an equivalent resistance of 16.6kΩ (three 50kΩ potentiometers in parallel).
PAGE 2
DS3930 Hex Nonvolatile Potentiometer with I/O and Memory ABSOLUTE MAXIMUM RATINGS Operating Temperature Range .......................... -40°C to +85°C Programming Temperature Range .........................0°C to +70°C Storage Temperature Range .............................-55°C to +125°C Soldering Temperature.................. See IPC/JEDEC J-STD-020A Voltage on VCC Relative to Ground...................... -0.5V to +6.0V Voltage on I/O0, I/O1, I/O2, I/O3, SDA, SCL, A0, A1, and A2 Relative to Ground* ...
PAGE 3
Hex Nonvolatile Potentiometer with I/O and Memory DS3930 ANALOG RESISTOR CHARACTERISTICS (VCC = +2.7V to +5.5V; TA = -40°C to +85°C, unless otherwise specified.) PARAMETER SYMBOL End-to-End Resistance Wiper Resistance CONDITIONS TA = +25°C (three 50kΩ pots in parallel) MIN TYP 13.2 RW MAX UNITS 16.5 19.
PAGE 4
DS3930 Hex Nonvolatile Potentiometer with I/O and Memory AC ELECTRICAL CHARACTERISTICS (continued) (VCC = +2.7V to +5.5V; TA = -40°C to +85°C, unless otherwise specified.) PARAMETER SYMBOL Data Hold Time (Notes 3, 5, 7) tHD:DAT Data Setup Time (Note 3) tSU:DAT Start Setup Time (Note 3) tSU:STA CONDITIONS MIN TYP MAX Fast mode 0 0.9 Standard mode 0 0.9 Fast mode 100 Standard mode 250 Fast mode 0.6 Standard mode 4.7 µs 20 + 0.1CB 300 Standard mode 20 + 0.
PAGE 5
Hex Nonvolatile Potentiometer with I/O and Memory (VCC = 5.0V; TA = +25°C, unless otherwise specified.) 180 VCC = 3V 160 4 3 2 140 SDA = VCC 680 SUPPLY CURRENT (µA) SUPPLY CURRENT (µA) 200 HI = 5V LO = GND 5 740 DS3930 toc02 VCC = 5V 6 VOLTAGE (V) SDA = SCL = 5V DS3930 toc01 220 ACTIVE SUPPLY CURRENT vs. SCL FREQUENCY WIPER VOLTAGE vs. WIPER SETTING DS3930 toc03 SUPPLY CURRENT vs.
PAGE 6
Hex Nonvolatile Potentiometer with I/O and Memory DS3930 Pin Description 6 PIN NAME 1 A0 Address Input. The address input pins determine the 2-wire address of the device. FUNCTION 2 A1 Address Input 3 A2 Address Input 4 SDA 2-Wire Serial Data I/O. This pin is for serial data transfer to and from the device. 5 SCL 2-Wire Serial Clock Input. The serial clock input is used to clock data into and out of the device.
PAGE 7
Hex Nonvolatile Potentiometer with I/O and Memory DS3930 EEPROM VCC 00h 3Fh 40h EFh F0h F1h F2h F3h F4h F5h F6h F7h F8h 64 BYTES OF EEPROM 8 50kΩ POT0 HI0-2 W0 RESERVED 8 POT0 CONTROL POT1 50kΩ W1 POT1 CONTROL POT2 CONTROL 8 POT2 50kΩ W2 POT3 CONTROL LO0-5 POT4 CONTROL POT5 CONTROL HI3-5 8 50kΩ POT3 I/O CONTROL W3 I/O STATE 8 RESERVED 50kΩ POT4 W4 FFh 8 POT5 50kΩ W5 SDA SCL 8 I/O0 2-WIRE INTERFACE A0 I/O CELL X 4 4 A1 I/O1 I/O2 I/O3 A2 GND DS3930 Figure 1.
PAGE 8
DS3930 Hex Nonvolatile Potentiometer with I/O and Memory I/O Signals The I/O pins can be used as general-purpose digital I/O signals. The I/O pins have CMOS outputs with an Table 1. I/O Pin Truth Table PULLUP CTRL (I/O CONTROL REGISTER) (BITS 7 TO 4) I/O PIN SETTING (I/O CONTROL REGISTER) (BITS 3 TO 0) I/O PIN OUTPUT 0 0 0 0 1 1 1 0 0 1 1 Pullup disabled (HI-Z) internal pullup resistor (see Figure 2).
PAGE 9
Hex Nonvolatile Potentiometer with I/O and Memory PULLUP CTRL The following bus protocol has been defined: • Data transfer can be initiated only when the bus is not busy. • During data transfer, the data line must remain stable whenever the clock line is high. Changes in the data line while the clock line is high are interpreted as control signals. Accordingly, the following bus conditions have been defined: RI/O I/O PIN SETTING I/O INPUT ESD Bus Not Busy: Both data and clock lines remain high.
PAGE 10
DS3930 Hex Nonvolatile Potentiometer with I/O and Memory MSB 0 A2 A1 DEVICE ADDRESS A0 R/W REA D/W DEVICE IDENTIFIER 1 IT 0 RIT EB 1 LSB Figure 4. Slave Address terminated with a stop condition. The number of data bytes transferred between start and stop conditions is not limited and is determined by the master device. The information is transferred byte-wise and each receiver acknowledges with a ninth bit.
PAGE 11
Hex Nonvolatile Potentiometer with I/O and Memory DS3930 SDA tBUF tSP tHD:STA tLOW tR tF SCL tHD:STA STOP tSU:STA tHIGH tSU:DAT START REPEATED START tSU:STO tHD:DAT Figure 5.
PAGE 12
DS3930 Hex Nonvolatile Potentiometer with I/O and Memory Wiper Resistance One difference between digital potentiometers and mechanical potentiometers is the wiper resistance. The wiper resistance (RW) is a result of the interconnecting materials on the IC between the internal resistive elements and the wiper pin. This can be modeled by using an ideal potentiometer, with a resistance of RW connected between the ideal wiper and wiper terminal of the digital potentiometer.