DS1848 Datasheet, PDF (1/17 Pages) Dallas Semiconductor – Dual Temperature-Controlled NV Variable Resistor & Memory

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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
DS1848
Dual Temperature-Controlled
NV Variable Resistor & Memory
PIN ASSIGNMENT
SDA 1
SCL 2
A0 3
A1 4
A2 5
WP 6
GND 7
14 Vcc
13 H0
12 NC
11 H1
10 L1
9 NC
8 L0
14-Pin TSSOP (173-mil)
Top View
A
B
C
D
16-Ball¹CSBG²A (4m³m x 4⁴mm)
DESCRIPTION
The DS1848 Dual Temperature-Controlled Nonvolatile (NV) Variable Resistor consists of two 256-
position 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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