DS1851E-010+ Analog Devices

19-5733 Rev 1/11 DS1851 Dual Temperature-Controlled NV Digital-to-Analog Converters www.maxim-ic.com FEATURES PIN ASSIGNMENTS Two temperature-controlled 8-bit Digital-to- SDA 1 8 V CC Analog Converters (DACs) SCL 2 7 V rc DAC settings changeable every 4C V 3 6 OutV rg Access to temperature data and device GND 4 5 OutG control through a 2-wire interface Operates with +3.3V or +5V supplies 8-Pin TSSOP (173mil) Packaging: 8-pin TSSOP Operating temperature: -40C to +95C Programming temperature: 0C to +70C PIN DESCRIPTIONS V - +3.3V or +5V Power Supply CC ORDERING INFORMATION Input DS1851E-010 8-pin 173mil TSSOP GND - Ground DS1851E-010+ 8-pin 173mil TSSOP SDA - 2-Wire Serial Data DS1851E-010+T&R 8-pin 173mil TSSOP Input/Output +Denotes a lead(Pb)-free/RoHS-compliant package. SCL - 2-Wire Serial Clock Input T&R = Tape and reel. OutG - DAC Output with Respect to Ground V - Reference Input from Ground rg OutV - DAC Output with Respect to V CC V - Reference Input from V rc 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 4C increment over the -40C to +95C range. The output of the digital temperature sensor is also available as a 12-bit, twos complement value over the serial bus. 1 of 18 DS1851 DS1851 BLOCK DIAGRAM Figure 1 40x8 bit 40x8 bit EEPROM EEPROM Look-Up Table 2 Look-Up Table 1 (DAC-G) (DAC-V) 2-Wire SDA Interface Table Select Byte SCL V CC Configuration Byte GND Temperature MSB Byte Temperature LSB Digital Byte Temperature GND 8-bit DAC-G Sensor Address Pointer V rg User Memory OutG DAC-V Setting 8-bit DAC-V V CC DAC-G Setting V rc User Memory OutV 2 of 18