TMP421 Datasheet, PDF (1/26 Pages) Burr-Brown (TI) – ±1°C Remote and Local TEMPERATURE SENSOR in SOT23-8

BurrĆBrown Products
from Texas Instruments
TMP421
TMP422
SBOS398A – JULY 2007 – REVISED SEPTEMBER 2007
±1°C Remote and Local TEMPERATURE SENSOR
in SOT23-8
FEATURES
1
•2345 SOT23-8 PACKAGE
• ±1°C REMOTE DIODE SENSOR (MAX)
• ±1.5°C LOCAL TEMPERATURE SENSOR (MAX)
• SERIES RESISTANCE CANCELLATION
• n-FACTOR CORRECTION
• TWO-WIRE/SMBus™ SERIAL INTERFACE
• MULTIPLE INTERFACE ADDRESSES
• DIODE FAULT DETECTION
• RoHS COMPLIANT AND NO Sb/Br
APPLICATIONS
• PROCESSOR/FPGA TEMPERATURE
MONITORING
• LCD/DLP^®/LCOS PROJECTORS
• SERVERS
• CENTRAL OFFICE TELECOM EQUIPMENT
• STORAGE AREA NETWORKS (SAN)
DESCRIPTION
The TMP421 and TMP422 are remote temperature
sensor monitors with a built-in local temperature
sensor. The remote temperature sensor
diode-connected transistors are typically low-cost,
NPN- or PNP-type transistors or diodes that are an
integral part of microcontrollers, microprocessors, or
FPGAs.
Remote accuracy is ±1°C for multiple IC
manufacturers, with no calibration needed. The
Two-Wire serial interface accepts SMBus write byte,
read byte, send byte, and receive byte commands to
configure the device.
the TMP421 and TMP422 include series resistance
cancellation, programmable non-ideality factor, wide
remote temperature measurement range (up to
+150°C), and diode fault detection.
The TMP421 and TMP422 are both available in an
8-lead, SOT23 package.
V+
8
V+
5 _GND
N-Factor
Correction
Local
Temperature
Register
Conversion
Rate
Register
1 DXP
2 DXN
Remote
Temperature
Register
Status
Register
TMP421
Configuration
Register
Manufacturer
ID Register
Device
ID Register
Configuration
Register
Resolution
Register
3 A1
4 A0
Bus
Interface
SCL
7
SDA
6
Pointer
Register
V+
8
V+
5 _GND
N-Factor
Correction
Local
Temperature
Register
1 DX1
Conversion
Rate
Register
2 DX2
3
DX3
4
DX4
Remote
Temperature
Register
Status
Register
TMP422
Configuration
Register
Manufacturer
ID Register
Device
ID Register
Configuration
Register
Resolution
Register
Bus
Interface
SCL
7
SDA
6
Pointer
Register
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
DLP is a registered trademark of Texas Instruments.
2
SMBus is a trademark of Intel Corporation.
3
I2C is a trademark of NXP Semiconductors.
4
All other trademarks are the property of their respective owners.
5
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007, Texas Instruments Incorporated