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. J Document Feedback
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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. J | Page 2 of 23