Temperature Sensor. LM73-Q1 Datasheet

LM73-Q1 Sensor. Datasheet pdf. Equivalent

LM73-Q1 Datasheet
Recommendation LM73-Q1 Datasheet
Part LM73-Q1
Description 11- to 14-Bit Digital Temperature Sensor
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LM73-Q1
SNIS194 – DECEMBER 2016
LM73-Q1 2.7-V, SOT-23, 11- to 14-Bit Digital Temperature Sensor With 2-Wire Interface
1 Features
1 Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results
– LM73-Q1 Temperature grade 1: –40°C to
125°C
– LM73-Q1 HBM ESD Classification Level 2
– LM73-Q1 CDM ESD Classification Level C6
• Single Address Pin Offers Choice of Three
Selectable Addresses Per Version for a Total of
Six Possible Addresses.
• SMBus and I2C-compatible Two-Wire Interface
• Supports 400-kHz Operation
• Shutdown Mode With One-shot Feature Available
for Very Low Average Power Consumption
• Programmable Digital Temperature Resolution
From 11 Bits to 14 Bits
• Fast Conversion Rate Ideal for Quick Power Up
and Measuring Rapidly Changing Temperature
• Open-Drain ALERT Output Pin Goes Active When
Temperature is Above a Programmed
Temperature Limit
• Very Stable, Low-noise Digital Output
• UL Recognized Component
• Temperature Accuracy: ±1.45°C (Maximum)
• Temperature Range: –40°C to 125°C
• Conversion Time
– 11-Bit (0.25°C): 14 ms (Maximum)
– 14-Bit (0.03125°C): 112 ms (Maximum)
• Operating Supply Current: 320 µA (Typical)
• Shutdown Supply Current: 1.9 µA (Typical)
• Resolution: 0.25°C to 0.03125°C
2 Applications
• Automotive Climate Control
• Advanced Driver Assistance Systems (ADAS)
• Airflow Sensor
• Infotainment Processor Management
• Instrument Cluster Control
• UREA Sensors
• HID Lamps
3 Description
The LM73-Q1 is a digital output temperature sensor
featuring an integrated incremental Delta-Sigma
ADC. The LM73-Q1 communicates with a two-wire
interface that is compatible with SMBus and I2C
interfaces, and the host can query the LM73-Q1 at
any time to read temperature.
The LM73-Q1 operates over a wide temperature
range (–40°C to 125°C) and provides ±1.45°C
accuracy from –10°C to 80°C. The LM73-Q1 includes
four selectable resolution options that allow the
temperature conversion time and sensitivity to be
adjusted for optimal performance. The LM73-Q1
defaults to 11-bit mode (0.25°C/LSB), and will
measure temperature in a maximum time of 14 ms,
making it ideal for applications that require
temperature data very soon after power-up. In its 14-
bit maximum resolution mode (0.03125°C/LSB), the
LM73-Q1 is optimized to sense very small changes in
temperature.
A single multi-level address line selects one of three
unique device addresses. An open-drain ALERT
output goes active when the temperature exceeds a
programmable limit. Both the data and clock lines are
filtered for excellent noise tolerance and reliable
communication. Additionally, the LM73-Q1 has a
time-out feature that will automatically reset the clock
and data lines, if these lines are held low for an
extended period of time. This prevents a bus lock-up
condition without requiring host processor
intervention.
Device Information(1)
PART NUMBER
PACKAG
E
BODY SIZE (NOM)
LM73-Q1
SOT (6) 2.90 mm × 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Schematic
VDD = 2.7V to 5.5V
Address (set as desired for one
of three addresses)
ADDR
To / from processor
2-wire interface
SMBDAT
SMBCLK
1
6
4
3
LM73
5
2
Typical bypass 0.1 PF
To hardware
ALERT shutdown
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.



etcTI LM73-Q1
LM73-Q1
SNIS194 – DECEMBER 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Temperature-to-Digital Converter Characteristics..... 5
6.6 Logic Electrical Characteristics- Digital DC
Characteristics ........................................................... 6
6.7 SMBus Digital Switching Characteristics .................. 7
6.8 Typical Characteristics .............................................. 8
7 Detailed Description .............................................. 9
7.1 Overview ................................................................... 9
7.2 Functional Block Diagram ......................................... 9
7.3 Feature Description................................................... 9
7.4 Device Functional Modes........................................ 15
7.5 Register Map........................................................... 16
8 Application and Implementation ........................ 20
8.1 Application Information............................................ 20
8.2 Typical Application ................................................. 20
9 Power Supply Recommendations...................... 22
10 Layout................................................................... 22
10.1 Layout Guidelines ................................................. 22
10.2 Layout Example .................................................... 22
11 Device and Documentation Support ................. 23
11.1 Related Documentation ....................................... 23
11.2 Receiving Notification of Documentation Updates 23
11.3 Community Resources.......................................... 23
11.4 Trademarks ........................................................... 23
11.5 Electrostatic Discharge Caution ............................ 23
11.6 Glossary ................................................................ 23
12 Mechanical, Packaging, and Orderable
Information ........................................................... 23
4 Revision History
DATE
December 2016
REVISION
*
NOTES
Initial release.
2 Submit Documentation Feedback
Product Folder Links: LM73-Q1
Copyright © 2016, Texas Instruments Incorporated



etcTI LM73-Q1
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5 Pin Configuration and Functions
DDC Package
6-Pin (SOT-23)
Top View
ADDR
1
6 SMBDAT
LM73-Q1
SNIS194 – DECEMBER 2016
GND 2 LM73 5 ALERT
VDD
3
4 SMBCLK
PIN
NO. NAME
TYPE
Pin Functions
EQUIVALENT CIRCUIT
FUNCTION
1 ADDR
2 GND
3 VDD
CMOS
Logic
Input
(three
levels)
PIN
Ground
Power
VDD
D1
Snap
Back
2.5k D2
D3
Address Select Input: One of three device addresses is selected by
connecting to ground, left floating, or connecting to VDD.
GND
Ground
Supply Voltage
PIN
CMOS
4 SMBCLK Logic
Input
Snap D1
Back
Serial Clock: SMBus clock signal. Operates up to 400 kHz. Low-pass
filtered.
GND
5 ALERT
Open-
Drain
Output
PIN
D1
Snap
Back
VDD
125 D2 Digital output which goes active whenever the measured temperature
exceeds a programmable temperature limit.
D3
GND
Open-
PIN
6
SMBDAT
Drain
Input/Outp
ut
Snap D1
Back
Serial Data: SMBus bi-directional data signal used to transfer serial
data synchronous to the SMBCLK. Low-pass filtered.
GND
Copyright © 2016, Texas Instruments Incorporated
Product Folder Links: LM73-Q1
Submit Documentation Feedback
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