DS1845 Datasheet, PDF (1/13 Pages) Dallas Semiconductor – Dual NV Potentiometer and Memory

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
V_CC
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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