DS1851 Datasheet, PDF (1/17 Pages) Dallas Semiconductor – Dual Temperature-Controlled NV Digital-to-Analog Converters

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DS1851
Dual Temperature-Controlled NV
Digital-to-Analog Converters
FEATURES
§ Two temperature-controlled 8-bit Digital-to-
Analog Converters (DACs)
§ DAC settings changeable every 4°C
§ Access to temperature data and device
control through a 2-wire interface
§ Operates with +3.3V or +5V supplies
§ Packaging: 8-pin TSSOP
§ Operating temperature: -40ºC to +95ºC
§ Programming temperature: 0ºC to +70ºC
ORDERING INFORMATION
DS1851E-010
8-pin 173mil TSSOP
DS1851E-010/T&R 8-pin Tape and Reel
TSSOP
PIN ASSIGNMENTS
SDA 1
8
SCL 2
7
Vrg
3
6
GND 4
5
VCC
Vrc
OutV
OutG
8-Pin TSSOP (173mil)
PIN DESCRIPTIONS
V_CC
- +3.3V or +5V Power Supply
Input
GND
- Ground
SDA
- 2-Wire Serial Data
Input/Output
SCL
- 2-Wire Serial Clock Input
OutG
- DAC Output with Respect to
Ground
V_rg
OutV
- Reference Input from Ground
- DAC Output with Respect to
V_CC
V_rc
- Reference Input from V_CC
DESCRIPTION
The DS1851 dual temperature-controlled nonvolatile (NV) DACs consists of two DACs, two EEPROM
look-up tables, and a direct-to-digital temperature sensor. Both of the DACs can be programmed with any
temperature coefficient, which means that any system temperature effects can be corrected without any
additional external devices. The DS1851 provides an ideal method for setting and temperature-
compensating bias voltages and currents in control applications using a minimal amount of external
circuitry.
The user-defined settings for both DACs are stored in two EEPROM look-up tables and can be accessed
over the industry-standard 2-wire serial bus, which consists of SDA and SCL pins. These look-up tables
can assign a unique output value to each DAC for every 4°C increment over the -40°C to +95°C range.
The output of the digital temperature sensor is also available as a 12-bit, two’s complement value over the
serial bus.
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