10-Bit Digital Temperature Sensor (AD7416) and Four Single-Channel ADCs AD7416/AD7417/AD7418 FEATURES FUNCTIONAL BLOCK DIAGRAMS 10-bit ADC with 15 s and 30 s conversion times 10-BIT BAND GAP ANALOG-TO-DIGITAL TEMPERATURE Single and 4 single-ended analog input channels CONVERTER SENSOR AD7416 On-chip temperature sensor: 40C to +125C On-chip track-and-hold TEMPERATURE VALUE Overtemperature indicator REGISTER SETPOINT Automatic power-down at the end of a conversion COMPARATOR T SETPOINT OTI ADDRESS 8 REGISTER V Wide operating supply range: 2.7 V to 5.5 V DD POINTER 2 REGISTER I C-compatible serial interface T SETPOINT HYST REGISTER Selectable serial bus address allows connection of up to 8 3 OTI FAULT QUEUE AD7416/AD7417 devices to a single bus CONFIGURATION COUNTER REGISTER 4 GND AD7416 is a superior replacement for LM75 7 A0 1 SDA SERIAL BUS A1 6 INTERFACE 2 SCL A2 5 APPLICATIONS Data acquisition with ambient temperature monitoring Figure 1. AD7416 Industrial process control REF V IN DD Automotive 5 14 Battery-charging applications T SETPOINT OTI A > B B 4 OTI REGISTER Personal computers TEMP A SENSOR CHARGE DISTRIBUTION DATA OUT DAC REF GENERAL DESCRIPTION 2.5V The AD7417 and AD7418 are 10-bit, 4-channel and single-channel 3 SCL A 7 IN1 CONTROL 2 CLOCK I C LOGIC ADCs with an on-chip temperature sensor that can operate from a INTERFACE A 8 IN2 SAMPLING 2 SDA MUX single 2.7 V to 5.5 V power supply. The devices contain a 15 s CAPACITOR A 9 IN3 successive approximation converter, a 5-channel multiplexer, a A 10 IN4 AD7417 temperature sensor, a clock oscillator, a track-and-hold, and a V BALANCE reference (2.5 V). The AD7416 is a temperature-monitoring only 1 16 6 15 13 12 11 NC NC GND CONVST A0 A1 A2 device in an 8-lead package. NC = NO CONNECT The temperature sensor on the parts can be accessed via multip- Figure 2. AD7417 lexer Channel 0. When Channel 0 is selected and a conversion V REF DD IN is initiated, the resulting ADC code at the end of the conversion 7 6 gives a measurement of the ambient temperature (1C 25C). T SETPOINT OTI A > B B 3 OTI On-chip registers can be programmed with high and low tempera- REGISTER TEMP A ture limits, and an open-drain overtemperature indicator (OTI) SENSOR CHARGE output is provided, which becomes active when a programmed DATA OUT DISTRIBUTION REF DAC limit is exceeded. 2.5V 2 SCL A configuration register allows programming of the sense of the A 5 MUX IN CONTROL 2 CLOCK I C LOGIC INTERFACE OTI output (active high or active low) and its operating mode SAMPLING 1 SDA CAPACITOR (comparator or interrupt). A programmable fault queue counter allows the number of out-of-limit measurements that must AD7418 occur before triggering the OTI output to be set to prevent V BALANCE 4 8 spurious triggering of the OTI output in noisy environments. GND CONVST Figure 3. AD7418 Rev. 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Trademarks and registered trademarks are the property of their respective owners. 01126-003 01126-002 01126-001AD7416/AD7417/AD7418 TABLE OF CONTENTS Features .............................................................................................. 1 On-Chip Reference .................................................................... 11 Applications....................................................................................... 1 Temperature Measurement ....................................................... 12 General Description ......................................................................... 1 Internal Register Structure........................................................ 12 Functional Block Diagrams............................................................. 1 Serial Bus Interface..................................................................... 14 Revision History ............................................................................... 2 OTI Output ................................................................................. 17 Product Highlights ........................................................................... 3 Fault Queue................................................................................. 17 Specifications..................................................................................... 4 Power-On Defaults..................................................................... 17 AD7417/AD7418 Specifications................................................. 4 Operating Modes........................................................................ 17 AD7416 Specifications................................................................. 6 CONVST Start Mode................................................................. 18 Absolute Maximum Ratings............................................................ 7 Applications Information .............................................................. 19 ESD Caution.................................................................................. 7 Supply Decoupling ..................................................................... 19 Pin Configurations and Function Descriptions ........................... 8 Power-On Reset.......................................................................... 19 Terminology .................................................................................... 10 Mounting the AD7416/AD7417/AD7418 .............................. 19 Theory of Operation ...................................................................... 11 Fan Controller............................................................................. 19 Circuit Information.................................................................... 11 Thermostat.................................................................................. 19 Converter Details........................................................................ 11 System with Multiple AD7416 Devices................................... 20 Typical Connection Diagram ................................................... 11 Outline Dimensions....................................................................... 21 Analog Inputs.............................................................................. 11 Ordering Guide .......................................................................... 23 REVISION HISTORY 11/10Rev. H to Rev. I 8/04Data Sheet Changed from Rev. F to Rev. G Changes to Figure 19...................................................................... 16 Changes to Figure 12...................................................................... 12 2/09Rev. G to Rev. H Changes to Reading Data from the AD7416/AD7417/AD7418 Section.............................................................................................. 13 Updated Format..................................................................Universal Changes to Data Sheet Title, Figure 2 and Figure 3..................... 1 Changes to Power-On-Reset section ........................................... 14 Moved Product Highlights Section................................................ 3 Changes to Table 1............................................................................ 4 7/03Data Sheet Changed from Rev. E to Rev. F Changes to Endnote 1, Table 2........................................................ 6 Updated Features...............................................................................1 Added Figure 5 Caption................................................................... 7 Updated Specifications .....................................................................3 Changes to Table 4............................................................................ 8 Updated Absolute Maximum Ratings ............................................6 Changes to Table 5 and Table 6....................................................... 9 Updated Ordering Guide .................................................................6 Changes to On-Chip Reference Section...................................... 11 Updated Product Highlights............................................................7 Changes to Figure 13...................................................................... 12 Updated Circuit Information...........................................................7 Changes to Table 8 and Table 10................................................... 13 Updated Temperature Measurement section ................................9 Changes to Figure 15, Figure 16, and Figure 17 ......................... 15 Changes to Reading Data From the AD7416/AD7417/AD7418 10/02Data Sheet Changed from Rev. D to Rev. E Section, Figure 18, and Figure 19 ................................................. 16 Edits to Specifications Headings .....................................................2 Change to Mode 1 .......................................................................... 17 Added Temperature Measurement section....................................8 CONVST Edits to Serial Bus Address section .............................................. 10 Changes to Figure 22 Caption and Pin Mode Edits to Figure 11............................................................................ 12 Section.............................................................................................. 18 Edits to CONVST Pin Mode section ........................................... 14 Moved Figure 21 and Figure 22 .................................................... 18 Changes to Power-On Reset Section............................................ 19 Edits to Power-On-Reset section ................................................. 14 Updated Outline Dimensions ....................................................... 21 Addition of Figures 16 and 17 ...................................................... 15 Changes to Ordering Guide .......................................................... 23 Updated Outlines ........................................................................... 16 Rev. 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