DS1845 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS1845

Dual NV Potentiometer and Memory

Dallas Semiconductor -> Maxim Integrated 

DS1845

Dual NV Potentiometer and Memory

www.dalsemi.com

FEATURES

Two linear taper potentiometers

− DS1845-010 one 10k, 100 position &

one 10k, 256 position

− DS1845-050 one 10k, 100 position &

one 50k, 256 postition

− DS1845-100 one 10k, 100 position &

one 100k, 256 position

256 bytes of EEPROM memory

Access to data and potentiometer control via

a 2-wire interface

External Write Enable pin to protect data and

potentiometer settings

Nonvolatile wiper storage in 2 bytes of

address space

Operates from 3V or 5V supplies

Packaging: Flip Chip Package, 16-ball

STPBGA, 14-pin TSSOP

Industrial operating temperature: -40ºC to

+85ºC

Programming temperature: 0ºC to +70ºC

PIN ASSIGNMENT

SDA 1

SCL 2

A0 3

A1 4

A2 5

WP 6

GND 7

14 Vcc

13 H0

12 W1

11 H1

10 L1

9 W0

8 L0

14-Pin TSSOP (173 mil)

14-Pin Flip Chip (100 x 100 mils)

16-BALL STPBGA (4 x 4 mm)

See Mech. Drawing Section

PIN DESCRIPTION

VCC

GND

- 3V or 5V Power Supply Input

- Ground

SDA

- 2-wire Serial Data

Input/Output

SCL

- 2-wire Serial Clock Input

WP

- Write Protect Input

A0, A1, A2 - Address Inputs

H0, H1

- High-End of Potentiometer

L 0, L1

- Low-End of Potentiometer

W0, W1

- Wiper Terminal of

Potentiometer

DESCRIPTION

The DS1845 Dual NV Potentiometer and Memory consists of one=100-position linear taper

potentiometer, one=256-position linear taper potentiometer, 256 bytes of EEPROM memory, and a 2-wire

interface. The device provides an ideal method for setting bias voltages and currents in control

applications using a minimum of circuitry. The EEPROM memory allows a user to store configuration

or calibration data for a specific system or device as well as provide control of the potentiometer wiper

settings. Any type of user information may reside in the first 248 bytes of this memory. The next two

addresses of EEPROM memory are for potentiometer settings and the remaining 6 bytes of memory are

reserved. These reserved and potentiometer registers should not be used for data storage. Access to this

EEPROM is via an industry standard 2-wire bus. The interface I/O pins consist of SDA and SCL. The

wiper position of the DS1845, as well as EEPROM data, can be hardware write-protected using the Write

Protect (WP) input pin.

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051900

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