0.5C Accurate Digital Temperature Sensor and Quad Voltage Output 12-/10-/8-Bit DACs ADT7316/ADT7317/ADT7318 FEATURES PIN CONFIGURATION ADT7316four 12-bit DACs 1 16 V -B V -C OUT OUT ADT7317four 10-bit DACs 2 15 V -A V -D OUT OUT ADT7318four 8-bit DACs 3 14 V -AB ADT7316/ V -CD REF REF ADT7317/ Buffered voltage output 4 13 CS SCL/SCLK ADT7318 Guaranteed monotonic by design over all codes GND 5 12 TOP VIEW SDA/DIN (Not to Scale) 10-bit temperature-to-digital converter V 6 11 DOUT/ADD DD Temperature range: 40C to +120C D+ 7 10 INT/INT Temperature sensor accuracy of 0.5C 8 9 D LDAC Supply range: 2.7 V to 5.5 V DAC output range: 0 V to 2 V REF Figure 1. Power-down current : <10 A Internal 2.28 V option REF Double-buffered input logic Buffered/unbuffered reference input option Power-on reset to 0 V LDAC Simultaneous update of outputs ( function) On-chip rail-to-rail output buffer amplifier 2 I C-, SMBus-, SPI-, QSPI-, MICROWIRE-, and DSP- compatible 4-wire serial interface SMBus packet error checking (PEC) compatible 16-lead QSOP APPLICATIONS Portable battery-powered instruments Personal computers Telecommunications systems Electronic test equipment Domestic appliances Process control GENERAL DESCRIPTION 1 The reference for the four DACs is derived either internally The ADT7316/ADT7317/ADT7318 combine a 10-bit or from two reference pins (one per DAC pair). The outputs temperature-to-digital converter and a quad 12-/10-/8-bit of all DACs may be updated simultaneously using the software DAC, respectively, in a 16-lead QSOP. This includes a band LDAC LDAC function or external pin. The ADT7316/ADT7317/ gap temperature sensor and a 10-bit ADC to monitor and ADT7318 incorporate a power-on-reset circuit that ensures the digitize the temperature reading to a resolution of 0.25C. The DAC output powers up to 0 V and remains there until a valid ADT7316/ ADT7317/ADT7318 operate from a single 2.7 V to write takes place. 5.5 V supply. The output voltage of the DAC ranges from 0 V , with an output voltage settling time of 7 s typically. to 2 VREF The ADT7316/ADT7317/ADT7318 wide supply voltage range, 2 The ADT7316/ ADT7317/ADT7318 provide two serial inter- low supply current, and SPI-/I C-compatible interface make face options, a 4-wire serial interface that is compatible with them ideal for a variety of applications, including personal SPI, QSPI, MICROWIRE, and DSP interface standards, and a computers, office equipment, and domestic appliances. 2 2-wire SMBus/I C interface. They feature a standby mode that 1 Protected by the following U.S. patent numbers: 5,764,174 5,867,012 is controlled via the serial interface. 6,097,239 6,169,442. Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 20032007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 02661-006ADT7316/ADT7317/ADT7318 TABLE OF CONTENTS Features .............................................................................................. 1 Output Amplifier........................................................................ 21 Applications....................................................................................... 1 Thermal Voltage Output ........................................................... 21 Pin Configuration............................................................................. 1 Functional DescriptionMeasurement...................................... 23 General Description ......................................................................... 1 Temperature Sensor ................................................................... 23 Revision History ............................................................................... 2 VDD Monitoring .......................................................................... 23 Specifications..................................................................................... 3 On-Chip Reference .................................................................... 24 Functional Block Diagram .............................................................. 8 Round Robin Measurement...................................................... 24 DAC AC Characteristics.................................................................. 9 Single-Channel Measurement .................................................. 24 Absolute Maximum Ratings.......................................................... 10 Temperature Measurement Method ........................................ 24 ESD Caution................................................................................ 10 Temperature Value Format ....................................................... 25 Pin Configuration and Function Descriptions........................... 11 Interrupts..................................................................................... 26 Terminology .................................................................................... 12 Registers........................................................................................... 27 Typical Performance Characteristics ........................................... 14 Register Descriptions................................................................. 28 Theory of Operation ...................................................................... 19 Serial Interface ................................................................................ 36 Power-Up Calibration................................................................ 19 Serial Interface Selection ........................................................... 36 2 Conversion Speed....................................................................... 19 I C Serial Interface ..................................................................... 36 Functional DescriptionVoltage Output ................................... 20 SPI Serial Interface ..................................................................... 37 Digital-to-Analog Converters................................................... 20 Layout Considerations................................................................... 41 Digital-to-Analog Section ......................................................... 20 Outline Dimensions....................................................................... 42 Resistor String............................................................................. 20 Ordering Guide .......................................................................... 42 DAC External Reference Inputs ............................................... 20 6/04Rev. 0 to Rev. A REVISION HISTORY Updated Format...................................................................... Universal 1/07Rev. A to Rev. B Internal VREF Value Change................................................... Universal Updated Format..................................................................Universal Change to Equation in Thermal Voltage Output Section..............21 Changes to Table 3.......................................................................... 10 Changes to Outline Dimensions .......................................................40 Changes to Internal T Limit Register (Read/Write) HIGH Address 0x25 Section .................................................................. 33 8/03Revision 0: Initial Version Changes to Internal TLOW Limit Register (Read/Write) Address 0x26 Section .................................................................. 33 Changes to External THIGH Limit Register (Read/Write) Address 0x27 Section .................................................................. 33 External T Limit Register (Read/Write) Address 0x28 LOW Section.............................................................................................. 37 Changes to SPI Interface Section.................................................. 38 Updated Outline Dimensions ....................................................... 42 Changes to Ordering Guide .......................................................... 42 Rev. B Page 2 of 44