10-Bit Digital Temperature Sensor (AD7416) and 4-/1-Channel ADCs Data Sheet 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 Wide operating supply range: 2.7 V to 5.5 V REGISTER 8 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 AD7416 is a superior replacement for LM75 4 GND A0 7 1 SDA SERIAL BUS A1 6 INTERFACE 2 SCL APPLICATIONS A2 5 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 ADCs with an on-chip temperature sensor that can operate from a LOGIC INTERFACE A 8 IN2 SAMPLING SDA 2 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 device in an 8-lead package. NC NC GND CONVST A0 A1 A2 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 at 25C). T SETPOINT OTI On-chip registers can be programmed with high and low tempera- B A > B 3 OTI 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 A configuration register allows programming of the sense of the 2 SCL A 5 MUX IN CONTROL 2 CLOCK I C LOGIC OTI output (active high or active low) and its operating mode INTERFACE SAMPLING 1 SDA (comparator or interrupt). A programmable fault queue counter CAPACITOR allows the number of out-of-limit measurements that must AD7418 occur before triggering the OTI output to be set to prevent V BALANCE spurious triggering of the OTI output in noisy environments. 4 8 GND CONVST Figure 3. AD7418 Rev. 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Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 01126-003 01126-002 01126-001AD7416/AD7417/AD7418 Data Sheet 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 .......................................................................... 22 REVISION HISTORY 4/2018Rev. I to Rev. J Updated Outline Dimensions ....................................................... 21 Changes to Product Title ................................................................. 1 Changes to Ordering Guide .......................................................... 23 Changes to Ordering Guide .......................................................... 22 8/2004Rev. F to Rev. G 11/2010Rev. H to Rev. I Changes to Figure 12 ...................................................................... 12 Changes to Figure 19 ...................................................................... 16 Changes to Reading Data from the AD7416/AD7417/AD7418 Section .............................................................................................. 13 2/2009Rev. G to Rev. H Changes to Power-On-Reset section ........................................... 14 Updated Format .................................................................. Universal Changes to Data Sheet Title, Figure 2 and Figure 3 ..................... 1 7/2003Rev. E to Rev. F Moved Product Highlights Section ................................................ 3 Changes to Features Section ............................................................ 1 Changes to Table 1 ............................................................................ 4 Changes to Specifications Section ................................................... 3 Changes to Endnote 1, Table 2 ........................................................ 6 Changes to Absolute Maximum Ratings Section .......................... 6 Added Figure 5 Caption................................................................... 7 Changes to Ordering Guide Section ............................................... 6 Changes to Table 4 ............................................................................ 8 Changes to Product Highlights Section ......................................... 7 Changes to Table 5 and Table 6 ....................................................... 9 Changes to Circuit Information Section ........................................ 7 Changes to On-Chip Reference Section ...................................... 11 Changes to Temperature Measurement Section............................ 9 Changes to Figure 13 ...................................................................... 12 Changes to Table 8 and Table 10 ................................................... 13 10/2002Rev. D to Rev. E Changes to Figure 15, Figure 16, and Figure 17 ......................... 15 Changes to Specifications Headings ............................................... 2 Changes to Reading Data from the AD7416/AD7417/AD7418 Added Temperature Measurement Section ................................... 8 Section, Figure 18, and Figure 19 ................................................. 16 Changes to Serial Bus Address Section ....................................... 10 Change to Mode 1 .......................................................................... 17 Changes to Figure 11 ...................................................................... 12 CONVST CONVST Changes to Figure 22 Caption and Pin Mode Changes to Pin Mode Section ..................................... 14 Section .............................................................................................. 18 Changes to Power-On-Reset Section ........................................... 14 Moved Figure 21 and Figure 22 .................................................... 18 Inserted Figure 16 and Figure 17 Renumbered Sequentially .. 15 Changes to Power-On Reset Section ............................................ 19 Updated Outline Dimensions ....................................................... 16 Rev. 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