Dual Temperature-Controlled NV Variable Resistor & Memory - Dallas Semiconductor
Description
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DS1848
Dual Temperature-Controlled NV Variable Resistor & Memory PIN ASSIGNMENT
SDA SCL A0 A1 A2 WP GND
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FEATURES
§ § § § § § § § § § Two linear taper, temperature-controlled variable resistors DS1848-050 - One 50kW, 256 position - One 10kW, 256 position DS1848-010 - Two 10kW, 256 position Resistor settings changeable every 2°C Access to temperature data and device control via a 2-wire interface Operates from 3V or 5V supplies Packaging: 14-pin TSSOP, 16-ball CSBGA Operating temperature: -40ºC to +95ºC Programming temperature: 0ºC to +70ºC 128 bytes of user EEPROM
1 2 3 4 5 6 7
14 13 12 11 10 9 8
Vcc H0 NC H1 L1 NC L0
14-Pin TSSOP (173-mil)
Top View A B C D 2 (4mm 3 x 4mm) 4 16-Ball1 CSBGA
DESCRIPTION
The DS1848 Dual Temperature-Controlled Nonvolatile (NV) Variable Resistor consists of two 256position linear, variable resistors.
The DS1848-050 consists of one 10kW and one 50kW, while the DS1848-010 consists of two 10kW resistors; both incorporate a direct-to-digital temperature sensor.
The device provides an ideal method for setting and temperature-compensating bias voltages and currents in control applications using a minimum of circuitry.
The variable resistors settings are stored in EEPROM memory and can be accessed over the industry standard 2-wire serial bus.
The value of each variable resistor is determined by a temperature-addressed look-up table, which can assign a unique value to each resistor for every 2°C increment over the -40°C to +95°C range.
The output of the digital temperature sensor is also available as a 13-bit, 2’s complement value over the serial bus.
The interface I/O pins consist of SDA and SCL.
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081502
DS1848
PIN DESCRIPTIONS
Name TSSOP BGA VCC 14 A3 www.
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The DS1848 will support supply voltages ranging from +3.
0V to +5.
5V.
Ground Terminal.
2-Wire Serial Data Interface.
The serial data pin is for serial d...
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