Dual NV Potentiometer and Memory - Dallas Semiconductor
Description
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DS1845 Dual NV Potentiometer and Memory
PIN ASSIGNMENT
SDA SCL A0 A1 A2 WP GND 1 2 3 4 5 6 7 14 13 12 11 10 9 8 Vcc H0 W1 H1 L1 W0 L0
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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
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 SDA SCL WP A0, A1, A2 H0, H1 L 0, L1 W0, W1 - 3V or 5V Power Supply Input - Ground - 2-wire Serial Data Input/Output - 2-wire Serial Clock Input - Write Protect Input - Address Inputs - High-End of Potentiometer - Low-End of Potentiometer - 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 E...
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