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.

space

space

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.