Datasheet

SMBDAT
SMBCLK
Temperature
Sensor
Circuitry
Configuration
Register
Temperature
Register
Two-Wire
Serial Interface
2.7V to 5.5V
LM73
Manufacturer's
ID Register
T
HIGH
Register
T
LOW
Register
Pointer
Register
and
Decode Logic
Set-Point
Comparator
ADDR
Control/Status
Register
11-Bit to 14-Bit
Delta-Sigma
A/D Converter
GND
V
DD
ALERT
LM73
SNIS141D –OCTOBER 2005–REVISED MAY 2009 www.ti.com
DESCRIPTION (CONTINUED)
Available in a 6-pin SOT package, the LM73 occupies very little board area while operating over a wide
temperature range (-40°C to 150°C) and providing ±1.0°C accuracy from -10°C to 80°C. The user can optimize
between the conversion time and the sensitivity of the LM73 by programming it to report temperature in any of
four different resolutions. Defaulting to 11-bit mode (0.25°C/LSB), the LM73 measures temperature in a
maximum time of 14 ms, making it ideal for applications that require temperature data very soon after power-up.
In its maximum resolution, 14-bit mode (0.03125°C/LSB), the LM73 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, a time-out feature on the clock and data lines
causes the LM73 to automatically reset these lines if either is held low for an extended time, thus exiting any bus
lock-up condition without processor intervention.
Simplified Block Diagram
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