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Device ID Register
Manufacturer ID Register
THERM Hysteresis Register
Consecutive Alert
Configuration Register
TR
TL
Status Register
Conversion Rate
Register
One-Shot
Start Register
D+
1
5
7
8
2
3
Bus Interface Pointer Register
Resolution Register
Configuration Register
Local Temp Low Limit
Local THERM Limit
Local Temp High Limit
Remote Temp Low Limit
Remote THERM Limit
Remote Temp High Limit
Remote
Temperature
Register
Local
Temperature
Register
Temperature
Comparators
Interrupt
Configuration
SCL
GND
THERM
4
6
ALERT/THERM2
V+
V+
SDA
D-
TMP401
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TMP401
SBOS371B –AUGUST 2006–REVISED OCTOBER 2014
TMP401 ±1°C Programmable, Remote and Local, Digital Out Temperature Sensor
1 Features 3 Description
The TMP401 is a remote temperature sensor monitor
1
• ±1°C Remote Diode Sensor
with a built-in local temperature sensor. The remote
• ±3°C Local Temperature Sensor
sensor is capable of monitoring the temperature of
• Series Resistance Cancellation
any external PN junction. Typical sense elements
include low-cost NPN- or PNP-type transistors and
• THERM Flag Output
diodes, or accessible thermal diodes integrated within
• ALERT/THERM2 Flag Output
microcontrollers, microprocessors, or field-
• Programmable Over- and Undertemperature
programmable gate arrays (FPGAs).
Limits
The accuracy of the remote sensor is ±1°C for
• Programmable Resolution: 9- to 12-Bit
multiple IC manufacturers, with no calibration needed.
• Diode Fault Detection
The two-wire serial interface accepts SMBus write
byte, read byte, send byte, and receive byte
• SMBus-Compatible
commands to program alarm thresholds and to read
temperature data.
2 Applications
Features included in the TMP401 are series
• Servers and Workstations
resistance cancellation, wide remote temperature
• Desktop and Notebook Computers
measurement range (up to +150°C), diode fault
• Telecom and Network Infrastructure
detection, and temperature alert functions.
• Set Top Boxes
Device Information
(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
TMP401 VSSOP (8) 3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
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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.
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